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1.
Kathmandu Univ Med J (KUMJ) ; 20(79): 316-322, 2022.
Article in English | MEDLINE | ID: mdl-37042373

ABSTRACT

Background Severe acute respiratory syndrome corona virus-2 (SARS-CoV-2) variants, which have emerged due to several mutations in spike protein, have a potential to escape immune protection provided by the first-generation vaccines, thereby resulting in breakthrough infections. Objective To identify the socio-demographic factors, clinical features, and outcomes in both vaccinated and unvaccinated hospitalized patients infected with SARS-CoV-2. Method Socio-demographic details, clinical features, and the outcomes among fully vaccinated (double for Covishield/AstraZeneca and BBIBP-CorV and single for Janssen), partially vaccinated, and unvaccinated hospitalized patients with coronavirus disease of 2019 (COVID-19) were collected and analyzed using SPSS version 17. Result Among the hospitalized COVID-19 patients (n=299), 175 (58.5%) patients received a single-dose, 82 (27.4%) double-dose, and 124 (41.5%) did not receive any dose of the COVID-19 vaccines. The risk of SARS-CoV-2 infection when compared between vaccinated and unvaccinated patients was found to be associated among professional degree holders (23.4% versus 9.7%) (p<0.05), professional workers (43.4% vs. 25.0%) (p<0.05), hospitalization to general ward (76.6% vs. 72.6%) (p<0.05), and presence of multiple symptoms (> or equel 3) (86.8% vs. 75.0%) (p>0.05) and comorbidities (> or equal 2) (15.5% vs. 13.7%) (p>0.05). Despite such approximate incidences, the risk of in-hospital mortality among the vaccinated patients was reduced (0.6% vs. 3.2%) (p>0.05), when compared to the unvaccinated patients. The risk of in-hospital mortality was associated with the older age and the presence of multiple comorbidities including bronchial asthma, diabetes, and hypertension. Conclusion Full or partial vaccination against the SARS-CoV-2 variants of concerns might be effective in preventing in-hospital mortality among COVID-19 patients.


Subject(s)
COVID-19 Vaccines , COVID-19 , Humans , SARS-CoV-2 , ChAdOx1 nCoV-19
3.
Kathmandu Univ Med J (KUMJ) ; 16(61): 8-13, 2018.
Article in English | MEDLINE | ID: mdl-30631009

ABSTRACT

Background Expanded program on immunization is one of the most cost-effective and widely applied public health interventions in worldwide. It is priority program for government of Nepal. Objective To estimate the incomplete immunization and identify predictors of incomplete immunization among age of 12-60 months children residing in the slum areas of Kathmandu Valley. Method This cross sectional, community based door-to-door survey was carried out in slum areas of Kathmandu Valley in months of January to February, 2017. Among nine squatters; having more than 100 households, five were selected by using stratified random sampling. The total 505 children age of 12-60 months was included for study. The face-to-face interview with selected mothers was performed using the structured questionnaire. Mean and standard deviation was calculated for continuous variables and proportions with 95% confidence interval level for categorical variables. The chi-square analyses were used to evaluate association between selected variables with incomplete immunization. The p-value <0.05 was considered as statistically significant. Result The mean age of children was 34.7±17.8 months. Nearly half of the children (43.6%) were within age of 12-24 months. The mean age of mothers was 27.1±5.3 years and more than three quarters (82.2%) were literate. The incomplete immunization was 13.0%; it was found higher among female (14.7%) than male children (11.4%). The incomplete immunization was highly associated with poor knowledge on immunization schedule of mothers (p=0.001). Conclusion The incomplete immunization was higher than national mean. It was found association with poor knowledge on immunization schedule of mothers. So, the immunization program should be more strengthen in slum areas and need to expand the education program focusing on immunization schedule.


Subject(s)
Immunization/statistics & numerical data , Poverty Areas , Surveys and Questionnaires , Adult , Child, Preschool , Cross-Sectional Studies , Family Characteristics , Female , Humans , Immunization Programs , Infant , Male , Mothers/education , Nepal , Prevalence , Young Adult
4.
Kathmandu Univ Med J (KUMJ) ; 16(61): 49-52, 2018.
Article in English | MEDLINE | ID: mdl-30631017

ABSTRACT

Background A United Nations Children's Fund reported that the global low birth weight was 15.5%, more than 95.6% of them being from developing countries. Low Birth Weight is a major factor associated with neonatal deaths in developing countries. Also, birth weight is one of the major factor in determining child survival, growth and development. Objective The objective of the study was to identify the prevalence and associated factors of low birth weight among newborns delivered in Dhulikhel Hospital. Method A cross sectional research design was carried out among all newborns delivered at the maternity ward of Dhulikhel Hospital within a period of one year. Data were collected using delivery record register as well as its electronic version which was available in the ward. The collected data were entered and analyzed using software SPSS 20 version with descriptive and inferential statistics. Result Total 2,798 numbers of newborns delivered in the hospital during the period of one year met the inclusion criteria for the study. Among them, 21.6% had low birth weight. We found that low birth weight of newborns was significantly affected by younger age of the mother and lesser weeks of gestation at birth. There were no significantly affected by antenatal clinic visit, parity, sex of the baby, type of delivery. Conclusion The study found that more than one fifth of babies had Low Birth Weight. The study findings suggest that special emphasis should be given to minimize early pregnancy to avoid low birth weight babies.


Subject(s)
Infant, Low Birth Weight/psychology , Tertiary Care Centers , Adult , Cross-Sectional Studies , Female , Humans , Infant, Newborn , Nepal/epidemiology , Pregnancy , Prevalence , Risk Factors , Young Adult
5.
Kathmandu Univ Med J (KUMJ) ; 16(62): 166-170, 2018.
Article in English | MEDLINE | ID: mdl-30636759

ABSTRACT

Background Breast feeding is the priceless gift given by mother to her newborn. It also has benefits to both mothers and baby. Prevalence of exclusive breast feeding varies from 26.4% in one study to that of 82.2% in another study. Objective To assess the factors associated with exclusive breast feeding among mothers. Method A prospective cross-sectional study using systematic random sampling method, was carried out in Dhulikhel Municipality for two months in November and December 2017 after taking permission from KUSMS IRC and from Dhulikhel Municipality. The study sample was 218 mothers whose infants between 6 months to 1 year were included in the study. A structured and semi-structured interview schedule was used in order to collect the information. Descriptive statistics including frequency and percentage was calculated to summarize mothers' socio-demographic information. Chi-square test was used for non-parametric categorical data in order to find out the association between variables. P-value less than 0.05 were considered significant. Result The prevalence of exclusive breast feeding was 75.7% in the present study. Maternal age found to be varied from 17 years to 40 years. Maternal age, parity of mother and types of family found to be significantly associated with the practice of exclusive breast feeding (p < 0.05). Mothers' occupation and education level was not associated with the practice of exclusive breast feeding. Conclusion Majority of the mothers practice exclusive breast feeding (75.7%). Finding of this study i.e. the factors influencing the practice of exclusive breast feeding will help the health care workers to plan the community awareness program on it.


Subject(s)
Breast Feeding/statistics & numerical data , Mothers/psychology , Sociological Factors , Adult , Awareness , Cross-Sectional Studies , Female , Health Personnel , Humans , Infant , Nepal , Pregnancy , Prevalence , Prospective Studies
6.
J Nepal Health Res Counc ; 11(24): 126-32, 2013 May.
Article in English | MEDLINE | ID: mdl-24362599

ABSTRACT

BACKGROUND: Distribution and skill mix of health workforce has always been a challenge in rural Nepal. Workforce surpluses or shortages and inappropriate skill mix, decrease productivity and efficiency, deplete scarce resources and squander worker capabilities. This study was aimed at generating evidences on the current distribution and skill mix of health workforce in Nepal. METHODS: A cross-sectional study was conducted using both qualitative and quantitative methods.Fifteen districts representing three eco-developmental regions of Nepal were selected using multi-stage cluster sampling method. Out of 404 sampled health institutions, 747 health workers from 375 health institutions were interviewed. Observation was carried out in 256 health facilities. RESULTS: Currently, the vacant positions are mostly of doctors 74(38%) technicians 28 (21%) nurses 50 (10%) and paramedics 26 (6%)with respect to sanctioned positions. Variations of fulfilled positions occurred in all three ecological belts, with the Hill belt having the highest proportion of vacant posts 116 (16%).On the basis of types of health facilities, ayurvedic centres have the highest fulfilled positions 55 (95%) and the lowest in primary healthcare centres (PHCCs) 162 (81%). Proper skill mix was observed in 6 (43%) of hospitals and 3(18%) of PHCCs.Only 132 (17.7%) of health workers have taken part in orientation on non-communicable diseases (NCDs) despite the increasing trend of NCDs. CONCLUSIONS: There is scarcity of health workforce with appropriate skills, particularly in rural Nepal. Sanctioned positions and categories of health workers need to be revised on the basis of population growth and epidemiological shifts.


Subject(s)
Clinical Competence , Health Personnel , Clinical Competence/statistics & numerical data , Cost of Illness , Cross-Sectional Studies , Humans , Nepal , Qualitative Research , Rural Health Services
7.
J Nepal Health Res Counc ; 11(24): 138-43, 2013 May.
Article in English | MEDLINE | ID: mdl-24362601

ABSTRACT

BACKGROUND: The policy document of Nepal has spelled out commitment to involving civil society organisations (CSOs) in improving human resources for health (HRH). However, lack of empirical evidences, it is very hard to figure out exact situation about the roles and engagement of CSOs in HRH management. METHODS: A cross-sectional descriptive study was conducted using both quantitative and qualitative methods. Out of 404 sample health institutions, 747 health workforce from 375 health institutions were interviewed (<10% non-response rate) using the probability proportionate to size method as per World Health Organization (WHO) guidelines. RESULTS: Nearly 75% respondents had opined that the political parties were supporting the health institutions in the grassroots. It was found that the support from the CSO was better in Hill (54.9%) compared to Terai (46.9%) and Mountain (46.7%). The support was significantly different between rural (CI: 0.5063-0.591) and urban (CI: 0.3055-0.4363) (p <0.05, CI 95%). Mean index score of effectiveness of CSOs was found highest in Hills (0.3036) followed by Mountains (0.2669) and Terai (0.2589). Effectiveness of CSOs was found positively correlated with feeling of security by health workers and social prestige. CONCLUSIONS: The roles of civil society in HRH management still need to be recognized and well documented ensuring their active participation in formulation and implementation of policies, strategies and planning related to HRH for effective and quality healthcare services in Nepal.


Subject(s)
Community Networks , Health Workforce , Private Sector , Role , Adult , Confidence Intervals , Cross-Sectional Studies , Female , Humans , Male , Middle Aged , Nepal , Qualitative Research , Surveys and Questionnaires , World Health Organization
8.
J Nepal Health Res Counc ; 11(24): 153-7, 2013 May.
Article in English | MEDLINE | ID: mdl-24362604

ABSTRACT

BACKGROUND: In Nepal, the relationship of health worker and patient or community people is now deteriorating and the security and safety of health worker is becoming emerging issues. The poor relationship between community people and health worker is hampering the health service especially in rural setting. This study was aimed at finding the security perception and situation of health workforce in Nepal. METHODS: A cross-sectional descriptive study was conducted using both quantitative and qualitative methods. Out of 404 sample health institutions, 747 health workforce from 375 health institutions were interviewed (<10% non-response rate) using the probability proportionate to size method as per World Health Organization (WHO) guidelines. RESULTS: Nearly 168 (23%) of health workers felt some level of insecurity at their workplace. Mostly, doctors felt insecure at their workplace 24 (30%) and argued with service users , 26 (32.50%). Feeling of security was highest in central region 160 (83.30%). Nationwide, 121 (16%) of health workers faced some level of arguments with service users, which was highest in Tarai 64 (18.08%). Of the total harassment, both gender based and sexual harassment was higher among female health workers [20 (62.5%) and 13 (56.5%) respectively]. Only, 230 (30.7%) of health workers who suffered from workplace accidents got compensation and treatment. CONCLUSIONS: Higher proportions of health workers feel insecurity at workplace whereas provision of compensation was minimal. There is a need of strict implementation of Security of the Health Workers and Health Organizations Act, 2066 (2009) for effective health service delivery.


Subject(s)
Health Knowledge, Attitudes, Practice , Health Personnel/psychology , Safety Management , Security Measures , Community-Institutional Relations , Cross-Sectional Studies , Female , Health Facilities , Humans , Male , Nepal , Qualitative Research , Security Measures/statistics & numerical data , Violence/statistics & numerical data , Workplace
9.
J Wound Care ; 21(8): 369-73, 2012 Aug.
Article in English | MEDLINE | ID: mdl-22885309

ABSTRACT

Patients with profound sensorimotor deficits following spinal trauma/post spinal surgery are vulnerable to develop pressure ulceration. Here we present an unusual case of multiple pressure ulcers in an 11-year-old paraplegic child, with histiocytoma of the spine at the T1-T3 level. Although multiplicity of ulcers is not uncommon, this was the first case, in our institute, in which such a large number of pressure ulcers were encountered in a child. Successful management, using a multidisciplinary approach, led to improved quality of life and, at follow-up of more than 1 year, the child has not developed any new pressure ulcers, and neither is there any recurrence.


Subject(s)
Histiocytosis, Langerhans-Cell/surgery , Laminectomy/rehabilitation , Paraplegia/complications , Pressure Ulcer/etiology , Pressure Ulcer/surgery , Skin Transplantation , Spinal Diseases/surgery , Child , Histiocytosis, Langerhans-Cell/rehabilitation , Humans , Male , Paraplegia/rehabilitation , Spinal Diseases/rehabilitation
10.
Nepal Med Coll J ; 14(4): 283-6, 2012 Dec.
Article in English | MEDLINE | ID: mdl-24579535

ABSTRACT

College students form a large and important group of population eligible for blood donation. Studies report that students do not donate much, and medical students' blood donation rate is less as compared to non-medical students. To assess and compare the knowledge, attitude, and practice of blood donation among medical and non-medical Nepalese students. A cross-sectional descriptive study using structured self-administered questionnaire was conducted in students of medical (MBBS) and non-medical programs of different colleges of Nepal. Total 456 students, 177 non-medical and 279 medical, participated; 28.5% students were donors. More medical students donated blood, more often, and were more knowledgeable in all aspects of blood and blood donation related knowledge (p values 0.01 or less). In both groups, proportionately more boys donated than girls. Common reasons for not donating included no request, medically unfit, no information about blood collection services, fear of weakness, and fear related to venepuncture. Moral satisfaction was the commonest reason to donate. Among Nepalese students, medical students donate more and are more knowledgeable than non-medical students. Lack of information and lack of direct requests are important causes of fewer donors in the non-medical group and girls.


Subject(s)
Blood Donors/psychology , Health Knowledge, Attitudes, Practice , Students/psychology , Cross-Sectional Studies , Female , Humans , Male , Nepal , Students, Medical/psychology , Surveys and Questionnaires , Young Adult
11.
J Postgrad Med ; 57(4): 332-4, 2011.
Article in English | MEDLINE | ID: mdl-22120864

ABSTRACT

Malignancy arising from the blood vessels is a very rare finding in daily clinical practice. In addition, the finding can often be misdiagnosed and ill-treated. These tumors usually go unnoticed unless it has metastasized to distant tissues. Among these rare tumors, leiomyosarcoma is the most common. It mostly arises in the inferior vena cava (IVC). Clinical signs and symptoms are very vague. Usually it is often misdiagnosed as an abscess cavity in the liver or primary hepatic malignancy (when present at level II) or as a thrombus in the IVC. Radiological investigations are the key to proper diagnosis. Depending upon the exact location, further treatment options vary. Generally, it is believed that level II and level III tumors are amenable to surgery followed by chemo or radiotherapy. We present a rare case of leiomyosarcoma of IVC at level II being diagnosed with proper radiological investigations and its management with further stress on offering chemo-radiotherapy after its surgical removal as compared to only surgery performed earlier. This case report will throw some light on the proper management of such rare tumors in terms of their exact diagnosis and treatment in order to prolong patient survival.


Subject(s)
Leiomyosarcoma/diagnosis , Vascular Neoplasms/diagnosis , Aged , Female , Humans , Leiomyosarcoma/pathology , Vascular Neoplasms/pathology , Vena Cava, Inferior
12.
Pharmacognosy Res ; 3(1): 62-6, 2011 Jan.
Article in English | MEDLINE | ID: mdl-21731398

ABSTRACT

CONTEXT: Obsessive-compulsive disorder (OCD) is the fourth most common mental disorder and is diagnosed nearly as often as asthma and diabetes mellitus. Over the last decade, the inhibition of burying of glass marbles by mice has been used as an index of anti-OCD drug action in the so-called marble-burying test. Lagenaria siceraria (Molina) Standley (LS), commonly known as "bottle gourd" (English), possesses several medicinal properties; little is known about its action as a nerve tonic. OBJECTIVE: The purpose of this study was to characterize the anti-OCD (anti-compulsive) activity of the methanolic extract of the fruits of L. siceraria (Molina) Standley (LS) using the marble-burying behavior in mice. MATERIALS AND METHODS: The experiment was conducted in specific animal models of Swiss albino mice to evaluate marble-burying behavior. RESULTS AND CONCLUSIONS: Intraperitonial administration of 25 and 50 mg/kg of LS extract significantly (P < 0.001) decreased the total number of buried marbles. The effect was comparable to that of the fluoxetine (10 mg/kg, i.p.). Fluoxetine and LS fruit extract do not produce any overt motor dysfunction. Preliminary phytochemical screening of the methanolic extract of LS showed the presence of flavonoids, saponins, sterols, proteins, tannins and carbohydrates. The results of the study for the first time show that the plant possesses anti-compulsive (anti-OCD) activity, confirming the traditional claims. Future research should focus on the identification and the mechanism of action of the constituents from this plant.

13.
Nepal Med Coll J ; 13(2): 131-2, 2011 Jun.
Article in English | MEDLINE | ID: mdl-22364099

ABSTRACT

Vital capacity, frequently measured clinically as an index of pulmonary function, gives useful information about the strength of respiratory muscles and other aspects of lung functions. It is generally noted in sitting position. As in the supine position, respiratory excursions of diaphragm is highest in normal breathing, this study was planned to note whether there occurred any alteration in vital capacity in supine position in comparison to that noted in sitting position. Young sedentary non smoker healthy medial students (n = 100, age 19-22 years) of Nepal Medical College participated as volunteers in this study. Body mass index (BMI) of each of them was calculated. Vital capacity was noted in sitting position and in supine position with the help of a spirometer, following the standard procedure. Result exhibited greater vital capacity in supine posture than in sitting position in the same individual. Diaphragm is the major muscle of inspiration, responsible for some two-thirds of the vital capacity. Naturally, in supine posture the scope of diaphragmatic movements increased and as a result, vital capacity exhibited greater value in comparison to that recorded in sitting posture.


Subject(s)
Supine Position/physiology , Vital Capacity/physiology , Adult , Body Mass Index , Female , Humans , Male , Young Adult
14.
Nepal Med Coll J ; 12(1): 45-7, 2010 Mar.
Article in English | MEDLINE | ID: mdl-20677610

ABSTRACT

The present study was undertaken to assess the difference between the normal predicted value and observed value of pulmonary function test (PFT) amongst the asthmatic patients and also to compare the aforesaid observed values between male and female asthmatic patients. Clinically diagnosed cases (male 62, female 75) of bronchial asthma attending medical out patient department of Nepal Medical College Teaching Hospital were assessed. All the pulmonary parameters showed significantly less observed values than the normal predicted values except PEFR in female and FVC in male asthmatic patients. Hence, PEFR in female and FVC in male asthmatic patients might not be considered as a valid parameter to indicate bronchial asthma. Present study also revealed that all the pulmonary variables were significantly higher in males than in females.


Subject(s)
Asthma/physiopathology , Respiratory Function Tests , Spirometry , Adult , Female , Humans , Male , Middle Aged , Sex Factors
15.
Nepal Med Coll J ; 12(3): 154-7, 2010 Sep.
Article in English | MEDLINE | ID: mdl-21446363

ABSTRACT

The study was carried out to evaluate the immediate effect Bhramari pranayama, a slow breathing exercise for 5 minutes on heart rate and blood pressure. Heart rate and blood pressure of volunteers were recorded. The subject was directed to inhale slowly up to the maximum for about 5 seconds and then to exhale slowly up to the maximum for about 15 sec keeping two thumbs on two external auditory canal, index and middle finger together on two closed eyes and ring finger on the two sides of the nose. During exhalation the subject must chant the word "O-U-Mmmma" with a humming nasal sound mimicking the sound of a humming wasp, so that the laryngeal walls and the inner walls of the nostril mildly vibrate (Bhramari pranayama, respiratory rate 3/min). After 5 minutes of this exercise, the blood pressure and heart rate were recorded again. Both the systolic and diastolic blood pressure were found to be'decreased with a slight fall in heart rate. Fall of diastolic pressure and mean pressure were significant. The result indicated that slow pace Bhramari pranayama for 5 minutes, induced parasympathetic dominance on cardiovascular system.


Subject(s)
Blood Pressure , Breathing Exercises , Heart Rate , Adult , Female , Humans , India , Male
16.
Nepal Med Coll J ; 12(3): 190-2, 2010 Sep.
Article in English | MEDLINE | ID: mdl-21446371

ABSTRACT

Kidney stone analysis is the test done on the stone which cause problems when they block the flow of urine through or out of the kidneys. The stones cause severe pain and are also associated with morbidity and renal damage. There is also no clear understanding on the relative metabolic composition of renal calculi. Hence, the study is aimed to find out the chemical composition of it which can guide treatment and give information that may prevent more stones from forming. The study was carried out on the stones that had been sent to the department of Biochemistry (n = 99; M = 61; F = 38; Mean age: 33.6 +/- 14.4 years) Approximately 98.9% of stones were composed of oxalate, 95.9% of Calcium, 85.8% of phosphate, 62.6% of Urate, 46.4% of Ammonium and very few percentages of Carbonate.


Subject(s)
Kidney Calculi/chemistry , Adolescent , Adult , Aged , Calcium/analysis , Carbonates/analysis , Child , Child, Preschool , Female , Humans , Kidney Calculi/epidemiology , Male , Middle Aged , Oxalates/analysis , Phosphates/analysis , Quaternary Ammonium Compounds/analysis , Uric Acid/analysis , Young Adult
18.
Nepal Med Coll J ; 10(1): 25-7, 2008 Mar.
Article in English | MEDLINE | ID: mdl-18700626

ABSTRACT

Pranayama (breathing exercise), one of the yogic techniques can produce different physiological responses in healthy individuals. The responses of Alternate Nostril Breathing (ANB) the Nadisudhi Pranayama on some cardio-respiratory functions were investigated in healthy young adults. The subjects performed ANB exercise (15 minutes everyday in the morning) for four weeks. Cardio-respiratory parameters were recorded before and after 4-weeks training period. A significant increment in Peak expiratory flow rate (PEFR L/min) and Pulse pressure (PP) was noted. Although Systolic blood pressure (SBP) was decreased insignificantly, the decrease in pulse rate (PR), respiratory rate (RR), diastolic blood pressure (DBP) were significant. Results indicate that regular practice of ANB (Nadisudhi) increases parasympathetic activity.


Subject(s)
Breathing Exercises , Hemodynamics , Pulmonary Ventilation , Yoga , Adult , Female , Humans , Male
19.
Nepal Med Coll J ; 10(1): 28-9, 2008 Mar.
Article in English | MEDLINE | ID: mdl-18700627

ABSTRACT

Some pulmonary function tests along with cardio respiratory fitness test were performed to assess the health status of the young (19-21 years) non-smokers Nepalese medical students. Results revealed that the vital capacity was 3.46 liters and 2.40 liters among the boys and girls respectively. PEFR was found to be 597.98 l/min among the boys and 456.53 l/min among the girls. Likewise, VO2 max among the boys and girls were 54.32 ml/kg/min and 44.88 ml/kg/min respectively. It was evident from the result that the health status of the Nepalese medical students ill the present study group was fairly well. It might be due to their health awareness, balanced-nutritious diet and the habits of occasional physical exercise.


Subject(s)
Physical Fitness , Respiratory Function Tests , Adult , Female , Humans , Male , Oxygen Consumption , Peak Expiratory Flow Rate , Vital Capacity
20.
Proteins ; 53(4): 863-71, 2003 Dec 01.
Article in English | MEDLINE | ID: mdl-14635128

ABSTRACT

Introduction of Pro residues into helix interiors results in protein destabilization. It is currently unclear if the converse substitution (i.e., replacement of Pro residues that naturally occur in helix interiors would be stabilizing). Maltose-binding protein is a large 370-amino acid protein that contains 21 Pro residues. Of these, three nonconserved residues (P48, P133, and P159) occur at helix interiors. Each of the residues was replaced with Ala and Ser. Stabilities were characterized by differential scanning calorimetry (DSC) as a function of pH and by isothermal urea denaturation studies as a function of temperature. The P48S and P48A mutants were found to be marginally more stable than the wild-type protein. In the pH range of 5-9, there is an average increase in T(m) values of P48A and P48S of 0.4 degrees C and 0.2 degrees C, respectively, relative to the wild-type protein. The other mutants are less stable than the wild type. Analysis of the effects of such Pro substitutions in MBP and in three other proteins studied to date suggests that substitutions are more likely to be stabilizing if the carbonyl group i-3 or i-4 to the mutation site is not hydrogen bonded in the wild-type protein.


Subject(s)
Carrier Proteins/chemistry , Proline/chemistry , Amino Acid Substitution , Binding Sites/genetics , Calorimetry/methods , Carrier Proteins/genetics , Genotype , Hydrogen-Ion Concentration , Maltose-Binding Proteins , Mutation , Proline/genetics , Protein Denaturation , Protein Folding , Protein Structure, Secondary , Protein Structure, Tertiary , Temperature , Thermodynamics , Urea/chemistry
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