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Structural analysis of extracellular ATP-independent chaperones of streptococcal species and protein substrate interactions.
mSphere
January 2025
Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Unlabelled: During infection, bacterial pathogens rely on secreted virulence factors to manipulate the host cell. However, in gram-positive bacteria, the molecular mechanisms underlying the folding and activity of these virulence factors after membrane translocation are not clear. Here, we solved the protein structures of two secreted parvulin and two secreted cyclophilin-like peptidyl-prolyl isomerase (PPIase) ATP-independent chaperones found in gram-positive streptococcal species.
View Article and Find Full Text PDFSynaptotagmin-1 attenuates myocardial programmed necrosis and ischemia/reperfusion injury through the mitochondrial pathway.
Cell Death Dis
January 2025
Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, and the Department of Physiology, School of Basic Medicine, Shanxi Medical University, Taiyuan, China.
Programmed necrosis/necroptosis greatly contributes to the pathogenesis of cardiac disorders including myocardial infarction, ischemia/reperfusion (I/R) injury and heart failure. However, the fundamental mechanism underlying myocardial necroptosis, especially the mitochondria-dependent death pathway, is poorly understood. Synaptotagmin-1 (Syt1), a Ca sensor, is originally identified in nervous system and mediates synchronous neurotransmitter release.
View Article and Find Full Text PDFCalcium-binding protein CALU-1 is essential for proper collagen formation in Caenorhabditis elegans.
Cell Mol Life Sci
January 2025
Department of Infection Biology, Wonkwang University School of Medicine, Iksan, 54538, Republic of Korea.
Collagen, a major component of the extracellular matrix, is crucial for the structural integrity of the Caenorhabditis elegans cuticle. While several proteins involved in collagen biosynthesis have been identified, the complete regulatory network remains unclear. This study investigates the role of CALU-1, an ER-resident calcium-binding protein, in cuticle collagen formation and maintenance.
View Article and Find Full Text PDFExploration of the Role of Cyclophilins in Established Hepatitis B and C Infections.
Viruses
December 2024
INSERM U1052, CNRS UMR5286, Université Claude Bernard Lyon 1, Hospices Civils de Lyon, Lyon Hepatology Institute (IHU Everest), 69003 Lyon, France.
Cyclophilin (Cyp) inhibitors are of clinical interest in respect to their antiviral activities in the context of many viral infections including chronic hepatitis B and C. Cyps are a group of enzymes with peptidyl-prolyl isomerase activity (PPIase), known to be required for replication of diverse viruses including hepatitis B and C viruses (HBV and HCV). Amongst the Cyp family, the molecular mechanisms underlying the antiviral effects of CypA have been investigated in detail, but potential roles of other Cyps are less well studied in the context of viral hepatitis.
View Article and Find Full Text PDFCyclophilin A Regulates Tripartite Motif 5 Alpha Restriction of HIV-1.
Int J Mol Sci
January 2025
Clinic of Gastroenterology, Hepatology and Infectious Diseases, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany.
The peptidyl-prolyl isomerase A (PPIA), also known as cyclophilin A (CYPA), is involved in multiple steps of the HIV-1 replication cycle. CYPA regulates the restriction of many host factors by interacting with the CYPA-binding loop on the HIV-1 capsid (CA) surface. TRIM5 (tripartite motif protein 5) in primates is a key species-specific restriction factor defining the HIV-1 pandemic.
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