ESAT-6-like protein EsxB - P9WNK5 (ESXB_MYCTU)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P9WNK5: 1
A secreted protein. Acts as a strong host (human) T-cell antigen (PubMed:11940590). Involved in translocation of bacteria from the host (human) phagolysosome to the host cytoplasm (PubMed:17604718). Might serve as a chaperone to prevent uncontrolled membrane lysis by its partner EsxA; native protein binds poorly to artificial liposomes in the absence or presence of EsxA (PubMed:17557817, PubMed:26260636). EsxA and EsxA-EsxB are cytotoxic to pneumocytes (PubMed:19906174). EsxB (and EsxA-EsxB but not EsxA alone) activates human neutrophils; EsxB transiently induces host (human) intracellular Ca(2+) mobility in a dose-dependent manner, monocytes and lymphocytes do not respond (PubMed:25332123). Neutrophils respond to EsxB by chemotaxis and primed neutrophils treated with EsxB produce reactive oxygen species (ROS); Ca(2+) release and the ROS burst via are induced by an unidentified G-protein coupled receptor (PubMed:25332123). May help regulate assembly and function of the type VII secretion system (T7SS) (PubMed:25865481). UniProt
Pathway Maps
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Subunit Structure
Able to form a homodimer (By similarity). Forms a tight 1:1 complex with EsxA (ESAT-6) (PubMed:11940590, PubMed:14557536, PubMed:16048998, PubMed:16973880, PubMed:19854905, PubMed:19906174, PubMed:23150662, PubMed:26260636, PubMed:20085764, PubMed:15973432, PubMed:24586681). The complex persists even after secretion (PubMed:16048998). In vitro EsxB only interacts with non-acetylated EsxA; it interacts with C-terminally truncated EsxA (missing the last 10 residues) (PubMed:15378760). The native EsxA-EsxB complex dissociates at pH 4.0, and EsxA may then be freed to then lyse membranes (PubMed:17557817). Another study using recombinant protein did not find dissociation at acidic pH (PubMed:23150662). Recombinant heterodimer (with a His tag on EsxB) can be dissociated by the detergents amidosulfobetaine-14 and lauryldimethylamine N-oxide (PubMed:26260636). Interacts with EccCb1 (PubMed:14557536, PubMed:16973880, PubMed:25865481). Interacts with PPE68 (PubMed:17433643). Interacts with EccCa1, EccCb1, EsxA, EspI and EspJ (PubMed:19854905). An artificial EsxB-EsxA heterodimer interacts with EspA, EccB1, EccCa1, EccCb1, EspI, EspJ, EccA2 and EccE2; the latter 2 are from the adjacent ESX-2 locus (PubMed:19854905). Interacts with host (human) beta-2-microglobulin (B2M) in complex with EsxA; only binds free B2M and not B2M in complex with HLA-I (PubMed:25356553). UniProt
May be secreted as a 4 coiled-coil complex with EsxA (PubMed:16048998). The C-terminal domain is required for interaction with both EsxA and EccCb1; the last 7 amino acids are necessary and sufficient for EccCb1 binding and secretion (PubMed:16973880). UniProt
  • Other Gene names: esxB, cfp10, lhp, mtsA10, Rv3874, MTV027.09
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