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Toward the Synthesis of Strychnos Alkaloids: Effective Construction of Fused Cyclohexane and Pyrrolidine Portion of the Strychnos Skeleton via Domino Intermolecular and Intramolecular S2 Cyclization.
Chem Pharm Bull (Tokyo)
January 2025
Graduate School of Integrated Basic Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan.
A method for preparing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton has been developed using domino intermolecular and intramolecular S2 cyclization. Using this method, the formation of pyrrolidine proceeded smoothly with good yield without the E2 elimination product. This reaction condition is effective for synthesizing the fused cyclohexane and pyrrolidine portion of the strychnos skeleton.
View Article and Find Full Text PDFKinetic Isotope Effect in the Unfolding of a Protein Secondary Structure: Calculations for Beta-Sheet Polyglycine Dimers as a Model.
Biomolecules
January 2025
Institute of Chemical Kinetics and Combustion SB RAS, 3 Institutskaya Street, Novosibirsk 630090, Russia.
In the present work, we performed calculations of the kinetic isotope effect (KIE) on H/D, N/N, O/O, and C/C isotopic substitution in the dissociation of beta-sheet polyglycine dimers of different lengths into two monomer chains. This dissociation reaction, proceeding via breaking of the interchain hydrogen bonds (H-bonds), is considered to be a model of unfolding of the secondary structure of proteins. The calculated strengthening of the interchain hydrogen bonds N-H⋯O=C due to heavy isotope substitution decreases in the row H/D >> N/N > O/O > C/C.
View Article and Find Full Text PDFMultimorbidity patterns and function among adults in low- and middle-income countries: a scoping review.
BMJ Open
January 2025
Division of Physiotherapy, Department of Health and Rehabilitation Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.
Objectives: To map the scope of available evidence on relationships between multimorbidity patterns and functioning among adults in low- and middle-income countries (LMICs), and describe methods used.
Design: Scoping review guided by a five-step methodological framework and Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews reporting guidelines.
Data Sources: PubMed/MEDLINE, Scopus, EBSCOhost (CINAHL) and Cochrane databases were searched from January 1976 to March 2023, plus reference lists of included studies.
Patients with antiphospholipid antibodies preferentially seek health information from physicians: a cross-sectional online patient quantitative survey.
Rheumatol Int
January 2025
Division of Rheumatology, Department of Medicine, University of Calgary, Cumming School of Medicine, Calgary, AB, Canada.
Little is known about how patients with antiphospholipid syndrome (APS) or antiphospholipid antibodies (aPL) access and trust health information. This research aimed to: describe the sources of information most frequently accessed/trusted by patients with APS/aPL; identify if individuals with APS/aPL perceived their health had been negatively impacted by various sources and document obstacles to accessing health information. Patients meeting Revised Sapporo Criteria for APS or with ≥1 positive aPL on ≥2 occasions were recruited to an online survey regarding their health information use at diagnosis and within 6 months preceding survey completion.
View Article and Find Full Text PDFA lectin produced by a Streptomyces species targets mammalian pancreatic acinar cells in mice and humans.
Sci Rep
January 2025
Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, Duarte, USA.
Lectins are produced in almost all life forms, can interact with targets (glycans) in a cross-kingdom manner and have served as valuable tools for studying glycobiology. Previously, a bacterial lectin, named Streptomyces hemagglutinin (SHA), was found to agglutinate human type B erythrocytes. However, the binding of SHA to mammalian cell types other than human erythrocytes has not been explored.
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