The free fatty acid-binding pocket is a conserved hallmark in pathogenic ß-coronavirus spike proteins from SARS-CoV to Omicron.

As coronavirus disease 2019 (COVID-19) persists, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern (VOCs) emerge, accumulating spike (S) glycoprotein mutations. S receptor binding domain (RBD) comprises a free fatty acid (FFA)-binding pocket. FFA binding stabilizes a locked S conformation, interfering with virus infectivity. We provide evidence that the pocket is conserved in pathogenic ß-coronaviruses (ß-CoVs) infecting humans. SARS-CoV, MERS-CoV, SARS-CoV-2, and VOCs bind the essential FFA linoleic acid (LA), while binding is abolished by one mutation in common cold-causing HCoV-HKU1. In the SARS-CoV S structure, LA stabilizes the locked conformation, while the open, infectious conformation is devoid of LA. Electron tomography of SARS-CoV-2-infected cells reveals that LA treatment inhibits viral replication, resulting in fewer deformed virions. Our results establish FFA binding as a hallmark of pathogenic ß-CoV infection and replication, setting the stage for FFA-based antiviral strategies to overcome COVID-19.

Transitional Challenges and Role of Preceptor among New Nursing Graduates.

Introduction: The period of transition from nursing student to professional nurse is demanding. Most often the challenges among the novice nurses are attributed to the number of patients with complex illness and co-morbidities, inaccessible mentors, performance anxiety, communication difficulties, and blame/complaint culture. Transitional challenges could result in work dissatisfaction forcing novice nursing graduates to quit their jobs that result in a high turnover rate. The study aimed to identify the transitional challenges among new nursing graduates and the role of preceptor in various transitional challenges. Methods: The study adopted descriptive correlational design. The data were collected from 314 participants working in six different tertiary level public hospitals situated in six states of India. Casey-Fink graduate nurse experience survey-revised was used to collect the data and methods of this study were in line with the guidelines of Strengthening the Reporting of Observational studies in Epidemiology (STROBE). Descriptive and Inferential statistics were calculated using SPSS software version 16. Results: The study found that new nursing graduates are uncomfortable in performing numerous procedures independently and in accordance with them increased support would help them feel more supported or integrated into the unit. The study also found positive relationship between preceptor support and organizing and prioritizing, communication/leadership, professional satisfaction, and job satisfaction. Conclusion: New nursing graduates experience various challenges during their transition period in the areas of role expectation, confidence, workload, orientation, and fears. The preceptors and the nursing administrators needs to bring forth significant strategies to address these challenges.