Neisseria adhesin A

UniProtKB accession:  P0DV44

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UniProtKB description:  Adheres to and induces bacterial uptake by human epithelial cells in a microfilament-dependent process. Binding is reduced by pronase treatment, suggesting there is a protein receptor on the human cells (PubMed:15660996, PubMed:30327444). Possible human protein receptors include integrin beta-1 (ITGB1) and oxidized low-density lipoprotein receptor 1 (OLR1) (Probable). Binds to extracellular human Hsp90 (preferentially the beta isoform, HSP90AB1) on monocytes, binding stimulates monocytes in a TLR4-dependent fashion, polymixin B, which binds NadA, blocks the activation. Hsp90 is probably not the first receptor on human monocytes (PubMed:21949862). Non-membrane anchored protein (residues 24-350) is internalized into human epithelial cells by hijacking the endosome recycling pathway and may be recycled back to the cell surface, which might aid transcellular trafficking of the bacteria (PubMed:25347845). A bacterial cell surface protein; antisera against this protein induce complement-mediated killing of this and other strains (PubMed:12045242).