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To investigate the mechanisms underlying pneumococcal infection, a proteomic analysis was previously conducted to identify pneumococcal proteins in infected mouse samples. In the present study, we characterized three proteins, ATP synthase subunit beta (AtpD), ABC transporter transmembrane protein (Vex3), and fructose bisphosphate aldolase (Fba), which bind to human plasminogen and subsequently facilitate its conversion to plasmin by tissue-type plasminogen activator. These findings suggest that Streptococcus pneumoniae might exploit the proteolytic activity of plasmin to promote infection and highlights the potential importance of plasminogen-binding capacity in the pathogenesis of pneumococcal infection.
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http://dx.doi.org/10.1111/1348-0421.70000 | DOI Listing |
Lupus Sci Med
September 2025
Department of Clinical Immunology and Rheumatology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
Background: SLE has increased risk of invasive pneumococcal disease due to immune dysregulation and immunosuppression. European Alliance of Associations for Rheumatology recommendations suggest sequential vaccination with conjugate vaccine, followed by 23-valent pneumococcal polysaccharide vaccine (PPSV23). However, data on immunogenicity of sequential vaccination in SLE are limited.
View Article and Find Full Text PDFFront Immunol
September 2025
Department of Pediatric Nephrology, Radboud University Medical Centre, Amalia Children's Hospital, Nijmegen, Netherlands.
Hemolytic uremic syndrome caused by an invasive infection (SP-HUS) is a rare and severe disease that primarily affects children under two years of age. The pathophysiology of SP-HUS remains poorly understood, and treatment is largely supportive. Complement factor H (FH) is a key regulator of the alternative pathway of the complement system.
View Article and Find Full Text PDFJ Hazard Mater
August 2025
Department of Microbiology and Immunology, Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan; Division of Allergy, Asthma, and Rheumatology, Molecular Infectious Disease Research Center, Department of Pediatrics, Chang Gung Memorial Hospital at Li
Microplastics (MPs) are ubiquitous environmental pollutants posing serious concerns owing to their potential health implications. MPs exert detrimental effects via the plastic particles, MP-bound chemicals, and MP-carrying pathogens. Streptococcus pneumoniae (pneumococcus) is a major pathogen causing bacterial pneumonia and respiratory inflammation.
View Article and Find Full Text PDFMicrobiol Spectr
September 2025
Division of Pulmonary, Allergy and Critical Care, Department of Medicine, The University of Alabama at Birmingham, Birmingham, Alabama, USA.
Bacterial surface glycan polymerases, such as Wzy, are integral membrane-bound glycosyltransferases that synthesize various surface-bound glycopolymers by linking repeat units via α-glycosidic or β-glycosidic bonds. Despite its central role in the widely employed "Wzy/Wzx-dependent pathway" for glycan synthesis, Wzy remains poorly understood, largely due to its high sequence variability. Using (pneumococcus) capsules as a model, we leveraged AlphaFold and Orientation of Proteins in Membranes computational tools to predict 3D molecular architectures of pneumococcal Wzys and elucidate their correlation with glycosidic linkage stereochemistry.
View Article and Find Full Text PDF3 Biotech
September 2025
Research and Development, Biological E Limited, Plot No.1,Phase II, SP Biotech Park, Genome Valley, Shameerpet, Hyderabad, 500078 India.
is widely used in biopharmaceutical production due to its ability to grow aerobically and produce proteins intracellularly. However, the limitation of the fermentation process is acetate accumulation, a by-product of overflow metabolism during high-glucose aerobic growth, which negatively impacts cell growth and protein expression. Traditional strategies to mitigate this include genetic modifications or low-density fermentation, which have significant limitations.
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