Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 15 de 15
Filtrar
1.
J Palliat Med ; 2024 Jul 11.
Artigo em Inglês | MEDLINE | ID: mdl-38990601

RESUMO

In Ethiopia, there is a great need for culturally relevant, sustainable palliative care. Profound poverty and limited health care resources magnify the impact of disease in Ethiopia, one of the poorest countries in the world. The impacts of high burden of disease and poor access to health care include physical suffering, and detrimental economic effects. Thus, the potential for palliative care to improve health care allocation and reduce suffering is substantial. An immediate action could include harnessing the infrastructure of the iddir, which are centuries-old, indigenous neighborhood organizations that provide care and support for families during the time of a death. We propose a model of community-based palliative care instantiated within iddirs, in which they are trained as volunteers to deliver basic palliative care. Shifting the gaze of global health research towards local solutions in Ethiopia may reveal sustainable, effective strategies to improve care for millions in this vulnerable population.

2.
Int J Emerg Med ; 17(1): 46, 2024 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-38566013

RESUMO

Greece is a parliamentary republic in southeastern Europe populated by over 10 million permanent residents: 9 million reside on the mainland, with almost 4 million in the greater Athens area. The remaining 1 million populate the over 1200 Greek islands. In addition, more than 160,000 asylum-seekers reached Greece in 2022, and more than 25 million tourists have visited Greece in the last two years. Modern Greek Emergency Medicine (EM) is now in its 4th decade. The Greek government has focused the last few years on enhancing the quality of emergency services provided in public hospitals. Emergency Departments (EDs) are being modernized, undergraduate medical education gradually incorporates EM, and a specialty training program in emergency nursing has been established. However, the late recognition of the critical importance of EM as a specialty in Greece has resulted in the subsequent need to create three alternative pathways to EM, none of which are direct from residency. The first is a 24-month Emergency Medicine fellowship after completing a residency in another specialty and then passing the national exam. The second is for physicians who have worked in a public hospital ED (Gr: Ethniko Systima Ygeias (ESY) ESY for at least three years and successfully passed the national exam. The third, which no longer exists, is a 'grandfather' pathway for those physicians who worked in an ESY ED for five years prior to the creation of the fellowship training program. As a result, there is a critical shortage of EM-trained physicians, resulting in most care being provided by physicians without formal training in EM. This is further confounded by the country's challenging geography, with frequent air transfers from the islands to mainland hospitals. Creating an EM Residency training program is a critical next step to overcoming many of the challenges facing EM provision in Greece today: it would address the shortage of EM-trained providers, decrease the need for costly ground and air transfers, and improve the quality of emergency care throughout Greece.

3.
Afr J Emerg Med ; 13(4): 339-344, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-38162896

RESUMO

Background: Palliative Care offers patient-centered, symptom-focused relief for patients with incurable disease, and early integration of palliative care ensures quality of life and death while reducing medical impoverishment. The Emergency Department is an ideal yet understudied, under-utilized location to initiate palliative care. Objective: To evaluate the palliative care needs of patients with incurable disease and perceived barriers amongst healthcare providers in the Emergency Department of Kiruddu National Referral Hospital, Kampala, Uganda. Methods: A mixed methods survey of Emergency Department healthcare workers and patients was conducted. A crosse sectional survey of ninety-nine patients was conducted using the integrated Palliative Care Outcome Scale (IPOS). Eleven interviews were conducted with healthcare workers at Kiruddu Hospital, identified by purposive sampling. Descriptive and inferential statistics were used to analyze quantitative data.. Grounded theory approach was used to construct the in depth interview questions, code and analyze qualitative results and collapse these results into final themes. Results: The most common diagnoses were HIV/HIV-TB (32 %), heart disease (18 %), and sickle cell disease (14 %). The prevalence of unmet palliative care needs was substantial: more that 70 % of patients reported untreated symptoms e.g., pain, fatigue, difficulty breathing. Seventy-seven percent of the population reported severe or overwhelming pain. The main barriers to provision of palliative care in the Emergency Department as identified by healthcare workers were: (1) lack of adequate training in palliative care; (2) Challenges due to patient volume and understaffing; (3) the misconception that palliative care is associated with pain management alone; (4) Financial constraints as the greatest challenge faced by patients with incurable disease. Conclusions: We report a high prevalence of unmet palliative care needs among patients in this urban Ugandan Emergency Department, and important barriers reported by emergency healthcare providers. Identification of these barriers offers opportunities to overcome them including harnessing novel mHealth interventions such as clinical support apps or telehealth palliative care consultants. Integration of palliative care in this setting would improve the care of vulnerable patients, provide healthcare workers with an additional care modality while likely adding value to the health system.

4.
Artigo em Inglês | MEDLINE | ID: mdl-36414402

RESUMO

OBJECTIVES: Globally, cancer deaths are rising. In low-and-middle-income countries, there is a gap in access to palliative care (PC). We designed a feasibility trial to study the initiation of early PC in patients with cancer in Addis Ababa, Ethiopia. METHODS: A randomised controlled trial (RCT) of standard cancer care versus standard cancer care plus in-home PC was conducted. Follow-up was at 8 and 12 weeks. Primary outcomes were: (1) feasibility, (2) patient-reported PC outcomes (African Palliative Care Association Palliative Outcome Scale (APCA POS)), and (3) costs. RESULTS: Of 95 adults randomised (mean age 49.5 years; 66% female), 27 completed 3 study visits. Of these, 89% had stage III or IV disease. Recruitment was feasible, but attrition was high. APCA POS use was feasible, with significant within-arm improvements: 24% versus 18% reduction (p<0.0002, p<0.0025) in PC versus standard care, respectively. Standard care subjects reported higher out-of-pocket payments (5810 Ethiopian birr) (ETB) and lost wages of informal caregivers (74 900 ETB), multiple times an average Ethiopian salary (3696 ETB). CONCLUSION: It is feasible to conduct an RCT of early PC for patients with cancer in Ethiopia. Retention was the biggest challenge. This study revealed opportunities to improve care, and important feasibility results to inform future, larger scale PC research in Ethiopia and beyond.

5.
West J Emerg Med ; 23(4): 579-588, 2022 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-35980413

RESUMO

INTRODUCTION: The "4Ms" model - What Matters, Medication, Mentation, and Mobility - is increasingly gaining attention in age-friendly health systems, yet a feasible approach to identifying what matters to older adults in the emergency department (ED) is lacking. Adapting the "What Matters" questions to the ED setting, we sought to describe the concerns and desired outcomes of both older adult patients seeking ED care and their treating clinicians. METHODS: We conducted 46 dyadic semi-structured interviews of cognitively intact older adults and their treating clinicians. We used the "What Matters" conversation guide to explore patients' 1) concerns and 2) desired outcomes. We then asked analogous questions to each patient's treating clinician regarding the patient's priorities. Interviews were professionally transcribed and coded using an inductive approach of thematic analysis to identify emergent themes. RESULTS: Interviews with older adults lasted a mean of three minutes, with a range of 1-8 minutes. Regarding patients' concerns, five themes emerged from older adults: 1) concern through a family member or outpatient clinician recommendation; 2) no concern, with a high degree of trust in the healthcare system; 3) concerns regarding symptom cause identification; 4) concerns regarding symptom resolution; and 5) concerns regarding preservation of their current status. Regarding desired outcomes, five priority themes emerged among older adults: 1) obtaining a diagnosis; 2) returning to their home environment; 3) reducing or resolving symptoms; 4) maintaining self-care and independence; and 5) gaining reassurance. Responding to what they believed mattered most to older adult patients, ED clinicians believed that older adults were concerned primarily about symptom cause identification and resolution and primarily desired a return to the home environment and symptom reduction. CONCLUSION: This work identifies concerns and desired outcomes of both older adult patients seeking ED care and their treating clinicians as well as the feasibility of incorporating the "What Matters" questions within ED clinical practice.


Assuntos
Serviços Médicos de Emergência , Serviço Hospitalar de Emergência , Idoso , Humanos , Pesquisa Qualitativa
6.
PLOS Glob Public Health ; 2(1): e0000005, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36962095

RESUMO

BACKGROUND: Globally, there is a rise in chronic disease, including cancer, major organ failure and dementias. Patients and their families in low- and middle-income countries (LMICs) pay a high proportion of medical costs out of pocket (OOP), and a diagnosis of serious illness often has catastrophic financial consequences. We therefore conducted a review of the literature to establish what is known about OOP costs near end of life in LMICs. AIMS: To identify, organise and report the evidence on out-of-pocket costs in adult end-of-life populations in LMIC. METHODS: A systematic search of 8 databases and a hand search of relevant systematic reviews and grey literature was performed. Two independent reviewers screened titles and abstracts, assessed papers for eligibility and extracted data. The review was registered with PROSPERO and adhered to the Preferred Reporting items for Systematic Reviews and Meta Analyses. The Mixed Methods Appraisal Tool was used to assess quality. The Wagstaff taxonomy was used to describe OOP. RESULTS: After deduplication, 9,343 studies were screened, of which 51 were read and rejected as full texts, and 12 were included in the final review. OOP costs increased with advanced illness and disease severity. The main drivers of OOP were medications and hospitalizations, with high but variable percentages of the affected populations reporting financial catastrophe, lost income, foregone education and other pressures. CONCLUSION: Despite a small number of included studies and heterogeneity in methodology and reporting, it is clear that OOP costs for care near end of life in LMIC represent an important source of catastrophic health expenditures and impoverishment. This suggests a role for widespread, targeted efforts to avoid poverty traps. Financial protection policies for those suffering from incurable disease and future research on the macro- and micro- economics of palliative care delivery in LMIC are greatly needed.

7.
Afr J Emerg Med ; 11(4): 442-446, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34765429

RESUMO

INTRODUCTION: The Emergency Department (ED) of Mbarara Regional Referral Hospital serves a largely rural population of 4 million people in western Uganda. Here, ED patients with incurable illness often have prolonged stays. Palliative care (PC) is a low-cost intervention that focuses on alleviating pain and suffering for patients with incurable disease, while improving satisfaction with care and optimizing healthcare utilization. This is especially important in low resource settings. A prior needs assessment in our ED revealed that 50% of patients have PC needs. The ED is an optimal location to initiate PC, yet this rarely happens. There is a great need to identify factors affecting initiation of ED PC in our resource-limited setting. METHODS: A semi-structured questionnaire and chart review was conducted from March to August 2020. Patients admitted from the ED were assessed for PC needs. Those who met criteria were approached for inclusion and flagged for initiation of PC. The follow-up period was 7 days. RESULTS: Sixty two percent of those subjects flagged for initiation of PC received it. By day seven, 36.1 of the study population had died. ED initiation of PC varied significantly by diagnosis, with cancer patients more likely to receive PC (p = 0.0097). CONCLUSION: Important barriers to PC initiation were identified in our Ugandan ED, related to diagnosis. These barriers could be overcome by improving awareness of PC amongst patients and providers alike and implementing a PC screening tool for all admissions. Future research is needed to identify other barriers, as well as strategies for improved hospital-wide uptake of PC in this resource-limited setting.

8.
Healthc (Amst) ; 9(4): 100577, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34411923

RESUMO

BACKGROUND: Organizations have a key role to play in supporting healthcare workers (HCWs) and mitigating stress during COVID-19. We aimed to understand whether perceptions of support and communication by local leadership were associated with reduced reports of stress and burnout among frontline HCWs. METHODS: We conducted cross-sectional surveys embedded within emergency department (ED) workflow during the first wave of COVID-19 from April 9, 2020 to June 15th, 2020 within three EDs of a multisite health system in the Northeast United States. All ED HCWs were administered electronic surveys during shift via text message. We simultaneously conducted 64 qualitative interviews to better characterize and validate survey responses. Primary survey outcomes were levels of work stress and burnout. RESULTS: Over 10 week study, 327 of 431 (76%) frontline HCWs responded to at least one round of the survey. More useful communication mediated through higher perception of support was significantly associated with lower work stress (B = -0.33, p < 0.001) and burnout (B = -7.84, p < 0.001). A one-point increase on the communication Likert scale was associated with a 9% reduction in stress and a 19% reduction in burnout. Three themes related to effective crisis communication during COVID-19 emerged in interviews: (1) information consolidation prior to dissemination, (2) consistency of communication, and (3) bi-directional communication. CONCLUSION: This work suggests that effective local leadership communication, characterized by information consolidation, consistency, and bi-directionality, leads to higher perceptions of support and lower stress and burnout among ED frontline workers. As the pandemic continues, these results present an evidence-based framework for leaders to support frontline HCWs through effective crisis communication.


Assuntos
Esgotamento Profissional , COVID-19 , Esgotamento Profissional/epidemiologia , Comunicação , Estudos Transversais , Serviço Hospitalar de Emergência , Pessoal de Saúde , Humanos , Liderança , Pandemias , SARS-CoV-2
9.
Contemp Clin Trials Commun ; 18: 100564, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32309673

RESUMO

Patient-reported outcomes and economic aspects of Palliative Care (PC) provision in low-income countries (LIC) are under-studied. Demonstrating the economic value of PC is key to sustainability and guiding health care policy. Our preliminary data in Ethiopia demonstrated a widespread need for PC, poor access to it, and high out of pocket payments (OOP). We suspect that in this and other LIC, PC may function not only to reduce suffering but also as a poverty reduction strategy.We are conducting a randomized controlled trial of standard Oncology care versus standard Oncology care plus PC in newly diagnosed cancer patients in Addis Ababa. Ninety-seven adults presenting to Oncology Clinic will be randomized in a 1:1 ratio. Subjects receiving PC will meet with a PC provider at time of enrollment and at follow up visits in their homes. All subjects will be assessed via questionnaire at enrollment and follow-up Oncology visits at 8 ± 4 and 12 ± 4 weeks. A cost-consequence analysis will be performed, to include: patient-reported OOP and healthcare utilization, the latter to be assessed through chart adjudication. Outcomes will include change in African Palliative Care Association Palliative Outcome Score, changes in OOP and healthcare utilization.We hypothesize that the cost of home-based PC will be offset by improvements in patient-reported outcomes, decreased OOP and healthcare utilization, rendering PC cost-effective in this LIC. These findings may lead to widespread dissemination of an effective, sustainable and cost-saving public PC delivery strategy that would improve the quality of life and death for millions of people. TRIAL REGISTRATION: Clinicaltrials.gov NCT03712436.

10.
BMJ Support Palliat Care ; 9(2): 120-129, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30274970

RESUMO

INTRODUCTION: Of the 40 million people globally in need of palliative care (PC), just 14% receive it, predominantly in high-income countries. Within fragile health systems that lack PC, incurable illness is often marked by pain and suffering, as well as burdensome costs. In high-income settings, PC decreases healthcare utilisation, thus enhancing value. Similar cost-effectiveness models are lacking in low-income and middle-income countries and with them, the impetus and funding to expand PC delivery. METHODS: We conducted a systematic search of seven databases to gather evidence of the cost-effectiveness of PC in low-income and middle-income countries. We extracted and synthesised palliative outcomes and economic data from original research studies occurring in low-income and middle-income countries. This review adheres to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines and includes a quality appraisal. RESULTS: Our search identified 10 eligible papers that included palliative and economic outcomes in low-income and middle-income countries. Four provided true cost-effectiveness analyses in comparing the costs of PC versus alternative care, with PC offering cost savings, favourable palliative outcomes and positive patient-reported and family-reported outcomes. CONCLUSIONS: Despite the small number of included studies, wide variety of study types and lack of high-quality studies, several patterns emerged: (1) low-cost PC delivery in low-income and middle-income countries is possible, (2) patient-reported outcomes are favourable and (3) PC is less costly than the alternative. This review highlights the extraordinary need for robust cost-effectiveness analysis of PC in low-income and middle-income countries in order to develop health economic models for the delivery of PC, direct resource allocation and guide healthcare policy for PC delivery in low-income and middle-income countries.


Assuntos
Análise Custo-Benefício , Atenção à Saúde/economia , Enfermagem de Cuidados Paliativos na Terminalidade da Vida/economia , Cuidados Paliativos/economia , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Pobreza/economia , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino
11.
J Nurs Educ ; 57(5): 265-274, 2018 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-29718515

RESUMO

BACKGROUND: Improvement methods were applied to optimize NCLEX-RN first-attempt pass rates in an Accelerated Bachelor of Science in Nursing (ABSN) program. METHOD: An improvement team was formed comprising nursing faculty, a student, faculty leading a course in the ABSN program involved in preparing students for NCLEX-RN, and a faculty expert in improvement science. Two Plan-Do-Study-Act (PDSA) cycles aimed at increasing practice and mastery were conducted. Effects were assessed using inferential statistics and statistical process control analyses. RESULTS: One hundred eighty-four ABSN students participated over two semesters. Average practice questions per student per semester increased from 1,000 questions at baseline to 2,130 questions (p < .01) postintervention, average practice examinations from 2.9 to 3.2 (p < .05), and average practice test mastery from 6.8 to 7.2 on an 8-point scale (p < .05). First-attempt NCLEX-RN pass rates increased from 76.7% to 86.2% (p < .05). CONCLUSION: ABSN NCLEX-RN performance improved subsequent to this microsystem-based improvement effort. [J Nurs Educ. 2018;57(5):265-274.].


Assuntos
Bacharelado em Enfermagem/métodos , Bacharelado em Enfermagem/organização & administração , Licenciamento em Enfermagem/estatística & dados numéricos , Avaliação Educacional/estatística & dados numéricos , Humanos , Pesquisa em Educação em Enfermagem , Pesquisa em Avaliação de Enfermagem , Pesquisa Metodológica em Enfermagem , Estudantes de Enfermagem/psicologia , Estados Unidos
12.
J Palliat Med ; 21(5): 622-630, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29425055

RESUMO

BACKGROUND: Palliative care aims to reduce physical suffering and the emotional, spiritual, and psychosocial distress of life-limiting illness. Palliative care is a human right, yet there are vast disparities in its provision: of the 40 million people globally in need of palliative care, less than 10% receive it, largely in high-income countries. There is a particular paucity of data on palliative care needs across the spectrum of incurable disease in Ethiopia. OBJECTIVES: The aims of this research were to assess the overall burden of life-limiting illness, the costs associated with life-limiting illness, and barriers to accessing palliative care in Ethiopia. DESIGN: Mixed-methods case-series. SETTING/SUBJECTS: One hundred adults (mean age: 43.7 ± 14 years, 64% female) were recruited at three outpatient clinics (oncology, HIV, noncommunicable disease) and hospice patient homes in Ethiopia. MEASUREMENTS: Four internationally validated questionnaires were used to assess physical symptoms, psychosocial distress, and disability. In-depth interviews gauged poverty level, costs of care, and end-of-life preferences. Qualitative data were analyzed by thematic content, quantitative data by standard descriptive, frequency and regression analyses. RESULTS: In oncology, 95.5% of the population endorsed moderate or severe pain, while 24% were not prescribed analgesia. Importantly, 80% of the noncommunicable disease population reported moderate or severe pain. The mean psychosocial distress score was 6.4/10. Severe disability was reported in 26% of the population, with mobility most affected. Statistically significant relationships were found between pain and costs, and pain and lack of well-being. Very high costs were reported by oncology patients. Oncology withstanding, the majority of subjects wished to die at home. Oncology patients cited pain control as the top reason they preferred a hospital death. CONCLUSION: There are extensive unmet palliative care needs in Ethiopia. Untreated pain and high costs of illness are the major contributors to psychosocial distress and financial crisis in this Ethiopian population.


Assuntos
Assistência Ambulatorial/economia , Doença Crônica/economia , Doença Crônica/epidemiologia , Pacientes Ambulatoriais/estatística & dados numéricos , Cuidados Paliativos/economia , Assistência Terminal/economia , Adulto , Idoso , Assistência Ambulatorial/estatística & dados numéricos , Etiópia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Cuidados Paliativos/estatística & dados numéricos , Pesquisa Qualitativa , Inquéritos e Questionários , Assistência Terminal/estatística & dados numéricos
13.
BMJ Qual Saf ; 22(9): 719-26, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-23603474

RESUMO

BACKGROUND: The recognition of patient deterioration depends largely on identifying abnormal vital signs, yet little is known about the daily pattern of vital signs measurement and charting. METHODS: We compared the pattern of vital signs and VitalPAC Early Warning Score (ViEWS) data collected from admissions to all adult inpatient areas (except high care areas, such as critical care units) of a NHS district general hospital from 1 May 2010 to 30 April 2011, to the hospital's clinical escalation protocol. Main outcome measures were hourly and daily patterns of vital signs and ViEWS value documentation; numbers of vital signs in the periods 08:00-11:59 and 20:00-23:59 with subsequent vital signs recorded in the following 6 h; and time to next observation (TTNO) for vital signs recorded in the periods 08:00-11:59 and 20:00-23:59. RESULTS: 950 043 vital sign datasets were recorded. The daily pattern of observation documentation was not uniform; there were large morning and evening peaks, and lower night-time documentation. The pattern was identical on all days. 23.84% of vital sign datasets with ViEWS ≥ 9 were measured at night compared with 10.12-19.97% for other ViEWS values. 47.42% of patients with ViEWS=7-8 and 31.22% of those with ViEWS ≥ 9 in the period 20:00-23:59 did not have vital signs recorded in the following 6 h. TTNO decreased with increasing ViEWS value, but less than expected by the monitoring protocol. CONCLUSIONS: There was only partial adherence to the vital signs monitoring protocol. Sicker patients appear more likely to have vital signs measured overnight, but even their observations were often not followed by timely repeat assessments. The observed pattern of monitoring may reflect the impact of competing clinical priorities.


Assuntos
Fidelidade a Diretrizes , Monitorização Fisiológica/normas , Sinais Vitais , Inglaterra , Hospitais Gerais , Humanos , Monitorização Fisiológica/métodos , Sistemas Automatizados de Assistência Junto ao Leito , Guias de Prática Clínica como Assunto , Medicina Estatal
14.
J Bacteriol ; 185(16): 4734-47, 2003 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-12896992

RESUMO

The Neisseria gonorrhoeae genome encodes a homologue of the Escherichia coli FNR protein (the fumarate and nitrate reductase regulator). Despite its similarity to E. coli FNR, the gonococcal FNR only partially complemented an E. coli fnr mutation. After error-prone PCR mutagenesis of the gonococcal fnr gene, we identified four mutant fnr derivatives carrying the same S18F substitution, and we showed that the mutant FNR could activate transcription from a range of class I and class II FNR-dependent promoters in E. coli. Prompted by the similarities between gonococcal and E. coli FNR, we made changes in gonococcal fnr that created substitutions that are equivalent to previously characterized substitutions in E. coli FNR. First, our experiments showed that cysteine, C116, in the gonococcal FNR, equivalent to C122 in E. coli FNR, is essential, presumably because, as in E. coli FNR, it binds to an iron-sulfur center. Second, the L22H and D148A substitutions in gonococcal FNR were made. These changes are equivalent to the L28H and D154A changes in E. coli FNR, which had been shown to increase FNR activity in the presence of oxygen. We show that the effects of these substitutions in gonococcal FNR are distinct from those of the S18F substitution. Similarly, substitutions in the putative activating regions of gonococcal FNR were made. We show that the activity of gonococcal FNR in E. coli can be increased by transplanting certain activating regions from E. coli FNR. The effects of these substitutions are additive to those due to S18F. From these data, we conclude that the effects of the S18F substitution in gonococcal FNR are distinct from the effects of the other substitutions. S18 is immediately adjacent to one of three N-terminal cysteine residues that coordinate the iron-sulfur center, and thus the S18F substitution is most likely to stabilize this center. Support for this came from complementary experiments in which we created the S24F substitution in E. coli FNR, which is equivalent to the S18F substitution in gonococcal FNR. Our results show that the S24F substitution changes the activity of E. coli FNR and that the changes are distinct from those due to previously characterized substitutions.


Assuntos
Proteínas de Escherichia coli , Escherichia coli/genética , Proteínas Ferro-Enxofre , Neisseria gonorrhoeae/genética , Regiões Promotoras Genéticas , Ativação Transcricional , Sequência de Aminoácidos , Substituição de Aminoácidos , Escherichia coli/química , Escherichia coli/metabolismo , Proteínas de Escherichia coli/química , Proteínas de Escherichia coli/genética , Proteínas de Escherichia coli/metabolismo , Regulação Bacteriana da Expressão Gênica , Proteínas Ferro-Enxofre/química , Proteínas Ferro-Enxofre/genética , Proteínas Ferro-Enxofre/metabolismo , Modelos Moleculares , Mutagênese Sítio-Dirigida , Neisseria gonorrhoeae/química , Neisseria gonorrhoeae/metabolismo , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo
15.
Biochem J ; 373(Pt 3): 865-73, 2003 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-12720546

RESUMO

A cytochrome c peroxidase (CCP) produced by Neisseria gonorrhoeae has been shown to have novel characteristics by investigating its location, expression and role in Neisseria gonorrhoeae and by expression in Escherichia coli. Analysis of the N-terminus of CCP indicated that it is a lipoprotein with a signal peptide for cleavage by signal peptidase II. Expression of the gonococcal CCP in E. coli revealed that it is first synthesized as a pro-apo-cytochrome that is translocated across the cytoplasmic membrane. The signal peptide is cleaved and haem is attached in the periplasm. The gonococcal CCP was associated with the membrane of both E. coli and N. gonorrhoeae. The expression of a MalE-CCP fusion protein has allowed characterization of CCP in vitro. Evidence is presented that CCP protects gonococci from hydrogen peroxide, presumably in the periplasmic compartment of the cell. The expression of CCP is dependent on the transcription factor FNR, but is repressed by nitrite, indicating that it could be most important in the stationary-phase response. These data support the hypothesis that the gonococcal lipoprotein CCP is anchored to the membrane in the periplasm, where it might be responsible for the reduction of hydrogen peroxide. Other putative CCP lipoproteins have been identified, representing a new subclass of bacterial CCP proteins.


Assuntos
Citocromo-c Peroxidase/metabolismo , Neisseria gonorrhoeae/enzimologia , Sequência de Aminoácidos , Sequência de Bases , Catalase/genética , Clonagem Molecular , Citocromo-c Peroxidase/química , Citocromo-c Peroxidase/genética , Primers do DNA , Escherichia coli/genética , Dados de Sequência Molecular , Plasmídeos , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Homologia de Sequência de Aminoácidos , Frações Subcelulares/enzimologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...