Thiol/disulfide exchange occurs in rotavirus structural proteins during contact with intestinal villus cell surface.

Thiol/disulfide exchange occurs in rotavirus structural proteins during contact with intestinal villus cell surface. Acta Virol. 2020;64(1):44-58 Authors: Rivera M, Guerrero CA, Acosta O Abstract Protein disulfide isomerase (PDI) is an enzyme that catalyzes disulfide bond reduction or formation and rearrangements of disulfide bridges, and also functions as a chaperone. During entry of some of the viruses PDI participates in thiol-disulfide exchange. Previous reports show that rotavirus entry is interfered by impermeant thiol/disulfide exchange inhibitors and antibodies against PDI. Our objective was to assess the interaction between PDI and triple-layered particles (TLPs) from rotavirus strains ECwt and RRV and from a human rotavirus isolate (HI) during the early steps of virus entry in a system of isolated small intestinal villi. Purified soluble PDI was incubated with either isolated intestinal villi or cell membrane-enriched fractions in the presence or absence of thiol/disulfide inhibitors such as bacitracin, DTNB or N- ethylmaleimide followed by the assessment of the PDI interactions with TLPs and rotavirus structural proteins in terms of their redox state changes. Soluble and membrane-bound PDI was found to interact with TLPs from all the rotaviruses assayed and also with the isolated structural proteins represented by the recombinant rVP5* (a tryptic cleavage product of VP4), rVP6 and the native VP7. PDI interaction with TLPs and rotavirus structu...
Source: Acta Virologica - Category: Infectious Diseases Authors: Tags: Acta Virol Source Type: research

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Source: Environmental Health Insights - Category: Environmental Health Authors: Tags: Environ Health Insights Source Type: research
Rotaviruses (RVs) are recognized as a major cause of acute gastroenteritis (AGE) in infants and young children worldwide. Here we summarize the virology, disease burden, prevalence, distribution of genotypes a...
Source: Journal of Biomedical Science - Category: Biomedical Science Authors: Tags: Review Source Type: research
Abstract Species A rotavirus (RVA) is an important gastrointestinal pathogen that is widely distributed in humans, mammalian animals and birds. The RVA genome consists of eleven double-stranded RNA segments, enabling the generation of novel strains with new pathogenic or antigenic features by genetic reassortment. While reassortants between human and mammalian animal RVAs have been repeatedly described, data on the reassortment potential of avian RVA strains are rare. To investigate genome segment exchanges between avian and mammalian RVA strains, a plasmid-based reverse genetics strategy originally developed for ...
Source: Virus Research - Category: Virology Authors: Tags: Virus Res Source Type: research
Authors: Tamminen K, Heinimäki S, Vesikari T, Blazevic V Abstract We have previously shown that rotavirus (RV) inner capsid protein VP6 has an adjuvant effect on norovirus (NoV) virus-like particle- (VLP-) induced immune responses and studied the adjuvant mechanism in immortalized cell lines used as antigen-presenting cells (APCs). Here, we investigated the uptake and presentation of RV VP6 and NoV GII.4 VLPs by primary bone marrow-derived dendritic cells (BMDCs). The adjuvant effect of VP6 on GII.4 VLP presentation and NoV-specific immune response induction by BMDC in vivo was also studied. Intracellular stai...
Source: Journal of Immunology Research - Category: Allergy & Immunology Tags: J Immunol Res Source Type: research
Source: Gut Microbes - Category: Microbiology Authors: Source Type: research
AbstractAn unusual reassortant rotavirus A (RVA) strain was isolated during RVA surveillance in two previously hospitalized children in 2018. G/P typing revealed uncommon G9P[4] genotypes, so the strains were further characterized by Illumina next-generation sequencing. Whole-genome typing showed that the two strains had a DS-1-like backbone except for NSP2: G9-P[4]-I2-R2-C2-M2-A2-N1-T2-E2-H2. The two strains shared 99.9-100% nucleotide sequence identity in all genes.
Source: Archives of Virology - Category: Virology Source Type: research
Microalgae and probiotics such as Bifidobacterium and Lactobacillus genera are associated with human beneficial effects. The aim of this study was to evaluate the activity of Chlorella sorokiniana on Bifidobacterium longum and Lactobacillus plantarum viability in a dairy product (flan) and its microbial effect against rotavirus, which is one of the major diarrhea-causing pathogens worldwide. Microalge were isolated from a Mexican river and characterized by molecular tools. Their prebiotic activity was evaluated by determining Bifidobacterium longum and Lactobacillus plantarum shelf-life after incorporation in the food matr...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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Source: Cato-at-liberty - Category: American Health Authors: Source Type: blogs
In conclusion, Abu-Rawash WWTP acts as a source of HAdV and RVA, releasing them into El-Rahawy drain then to the River Nile Rosetta branch.
Source: Food and Environmental Virology - Category: Virology Source Type: research
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