Iron-regulated surface determinant protein B

UniProtKB accession:  Q7A656

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UniProtKB description:  Cell wall-anchored surface receptor that extracts heme from oxidized methemoglobin/metHb to enable growth on hemoglobin as a sole iron source (PubMed:24645787). Rapidly extracts heme from hemoglobin and transfers it to IsdA or IsdC, which then relays it to the membrane transporter/IsdEF for internalization (PubMed:24645787, PubMed:21574663, PubMed:29109153). Promotes also resistance to hydrogen peroxide and killing by neutrophils (By similarity).