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
 
Function
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
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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
Domain
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
This protein in other organisms (by gene name):
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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Validation Track

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Data in red indicates combined ranges of Homology Models from SBKB   and the Protein Model Portal  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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