Dataset Information

Identification of O-glycosylation sites in Clostridium botulinum and Geobacillus kaustophilus flagellins

ABSTRACT: In this study, we identified the O-glycosylation sites in recombinant Clostridium botulinum flagellin (CbFla) and Geobacillus kaustophilus flagellins, GkFlaA1 and GkFlaA2, expressed from the E. coli strains, EV136 and EV240 (K1:K12 strains engineered by Prof. Eric Vimr’s group to accumulate CMP-sialic acid in the cytosol), EV36 (wildtype K1:K12 strain), and BL21(DE3) (laboratory strain used for protein expression using T7 RNA polymerase). The recombinant flagellins were expressed with or without co-expression of motility associated factor (Maf) (flagellin nonulosonic acid glycosyltransferase) in these strains, purified and subjected to MS/MS analysis at Taplin Biological Mass Spectrometry facility.

INSTRUMENT(S): LTQ Orbitrap Velos

ORGANISM(S): Geobacillus Kaustophilus Hta426 Clostridium Botulinum F Str. Langeland

SUBMITTER: Ramya Chakravarthy

LAB HEAD: T.N.C. Ramya

PROVIDER: PXD018167 | Pride | 2020-09-07

REPOSITORIES: Pride

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Publications

Novel serine/threonine-O-glycosylation with N-acetylneuraminic acid and 3-deoxy-D-manno-octulosonic acid by bacterial flagellin glycosyltransferases.

Khairnar Aasawari A Sunsunwal Sonali S Babu Ponnusamy P Ramya T N C TNC

Glycobiology 20210401 3

Some bacterial flagellins are O-glycosylated on surface-exposed serine/threonine residues with nonulosonic acids such as pseudaminic acid, legionaminic acid and their derivatives by flagellin nonulosonic acid glycosyltransferases, also called motility-associated factors (Maf). We report here two new glycosidic linkages previously unknown in any organism, serine/threonine-O-linked N-acetylneuraminic acid (Ser/Thr-O-Neu5Ac) and serine/threonine-O-linked 3-deoxy-D-manno-octulosonic acid or keto-deo ...[more]

PMID: 32886756

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Project description:The healthy gut microbiota is composed of three different functional subgroups, symbionts, commensals and pathobionts. Additionally, infection with pathogenic bacteria can occur. Microbe Associated Molecular Patterns (MAMPs) are expressed by most members of both, microbiota and pathogens and interact with Pattern Recognition Receptors (PRRs), resulting in activation of the innate immune system. It is still unclear whether the interaction of PRRs with MAMPs of different origin, leads to a differential activation of innate immunity and whether thereby, distinction can be made between symbionts, commensals, pathobionts and pathogens. Here we addressed the question whether the interaction of flagellin with Toll-like receptor 5 (TLR5) might be a possible mechanism of the innate immune system to distinguish between the different microbial subgroups and initiate the respective immune response. To characterize distinct cellular immune responses to symbiont or pathogen derived flagellin we run transcriptomics, phosphoproteomics and proteomics of TLR5 overexpressing cells. Responses to different flagellins were characterized by differential kinetics and regulation of protein phosphorylation as well as variant protein expression patterns. In vivo experiments revealed that commensal derived flagellin mediated an inert TLR5 signal, thus not affecting Dextran-Sodium-Sulfate (DSS) induced intestinal inflammation. In vitro pathogenic derived flagellin induced a strong pro-inflammatory TLR5 response and did not ameliorate intestinal inflammation. In contrast, symbiont derived flagellin revealed an intermediate TLR5 activation and clearly ameliorated DSS induced intestinal inflammation thus shifting the host immune response in favor of mucosal immune balance. Bone marrow chimeric mice proofed that CD11c+TLR5+ intestinal lamina propria cells mediate the anti-inflammatory symbiotic effect of flagellin. We suggest that the quality of flagellin-induced TL signal might determine the balance between homeostasis and intestinal inflammation and may help the innate immune system to distinguish between symbionts, commensals, pathobionts and pathogenic microbes. We used microarrays to analyze differential expression of genes between treatments with flagellins of E. coli Nissle (EcN) and Salmonella Typhimurium SL1344 (ST).

Dataset Information

Identification of O-glycosylation sites in Clostridium botulinum and Geobacillus kaustophilus flagellins

Publications

Novel serine/threonine-O-glycosylation with N-acetylneuraminic acid and 3-deoxy-D-manno-octulosonic acid by bacterial flagellin glycosyltransferases.

Similar Datasets

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