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Elucidating assembly and function of VirB8 cell wall subunits refines the DNA translocation model in Gram-positive T4SSs.
Sci Adv
January 2025
Université de Lorraine, INRAE, DynAMic, F-54000 Nancy, France.
Bacterial type IV secretion systems (T4SSs) are widespread nanomachines specialized in the transport across the cell envelope of various types of molecules including mobile genetic elements during conjugation. Despite their prevalence in Gram-positive bacteria, including relevant pathogens, their assembly and functioning remain unknown. This study addresses these gaps by investigating VirB8 proteins, known to be central components of conjugative T4SSs in Gram-positive bacteria.
View Article and Find Full Text PDFGRASP55 Regulates Sorting and Maturation of the Lysosomal Enzyme β-Hexosaminidase A.
Mol Biol Cell
January 2025
Department of Molecular, Cellular and Developmental Biology, the University of Michigan, Ann Arbor, MI 48109, USA.
The Golgi apparatus plays a crucial role in the delivery of lysosomal enzymes. Golgi Reassembly Stacking Proteins, GRASP55 and GRASP65, are vital for maintaining Golgi structure and function. GRASP55 depletion results in the missorting and secretion of the lysosomal enzyme cathepsin D (Xiang , 2013), though the mechanisms remain unclear.
View Article and Find Full Text PDFPopulation structure of Clinostomum complanatum (Trematoda: Digenea) with new data on haplotype diversity of flukes from Slovakia and Italy.
Parasite
January 2025
Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3, 040 01 Košice, Slovakia.
The fluke Clinostomum complanatum, a parasite of piscivorous birds, but also reptiles and rarely mammals, has established several foci in the western Palaearctic regions. Previous studies pointed out the complicated taxonomy of the genus, but broader population genetic analysis of C. complanatum has not yet been carried out.
View Article and Find Full Text PDFStructure, kinetics, and mechanism of Pseudomonas putida sulfoquinovose dehydrogenase, the first enzyme in the sulfoglycolytic Entner-Doudoroff pathway.
Biochem J
January 2025
School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia.
The sulfosugar sulfoquinovose (SQ) is catabolized through the sulfoglycolytic Entner-Doudoroff pathway, beginning with the oxidation of SQ to sulfogluconolactone by SQ dehydrogenase. We present a comprehensive structural and kinetic characterization of Pseudomonas putida SQ dehydrogenase (PpSQDH). PpSQDH is a tetrameric enzyme belonging to the short-chain dehydrogenase/reductase (SDR) superfamily with a strong preference for NAD+ over NADP+.
View Article and Find Full Text PDFLuteinizing hormone receptor knockout mouse: What has it taught us?
Andrology
January 2025
Department of Digestion, Metabolism and Reproduction, Institute of Reproductive and Developmental Biology, Hammersmith Campus, Imperial College London, London, UK.
Luteinizing hormone (LH), along with its agonist choriongonadotropin (hCG) in humans, is the key hormone responsible for the tropic regulation of the gonadal function. LH and hCG act through their cognate receptor, the luteinizing hormone/choriongonadotropin receptor (LHCGR; more appropriately LHR in rodents lacking CG), located in the testis in Leydig cells and in the ovary in theca, luteal, and luteinizing granulosa cells. Low levels in LHCGR are also expressed in numerous extragonadal sites.
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