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TitleOligomeric assembly of the gatekeeper InvE orchestrates hierarchical type III protein secretion in Typhimurium.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 123, Issue 5, Page e2530441123, Year 2026
Publish dateFeb 3, 2026
AuthorsTingting Wang / Liyan Zhu / Emily Guo / Chunxiang Wu / Florian Schueder / Maria Lara-Tejero / Jorge E Galán /
PubMed AbstractType III secretion systems (T3SS) are critical virulence machines in many Gram-negative bacteria, enabling hierarchical secretion of translocases followed by effectors. In the serovar Typhimurium ...Type III secretion systems (T3SS) are critical virulence machines in many Gram-negative bacteria, enabling hierarchical secretion of translocases followed by effectors. In the serovar Typhimurium SPI-1 T3SS, the regulatory protein InvE (SctW) enforces this order. Here, we show that InvE assembles into tetramers and higher-order oligomers and that oligomerization is essential for function. A 2.4 Å cryo-electron microscopy (cryo-EM) structure reveals a tetramer built as a dimer of antiparallel dimers. Photocrosslinking maps one set of residues to the interdimer seams in this tetramer, while crosslinks from additional sites suggest lateral docking between dimers in alternative registries in vivo. Blue-native electrophoresis and SEC-MALS detect native high-molecular-weight species consistent with such assemblies. DNA-PAINT superresolution microscopy confirms the presence of higher-order InvE oligomers in vivo. Charge-reversal mutations that disrupt oligomerization collapse InvE to monomers and abolish secretion, effector translocation, invasion, and virulence. Together, these data define an oligomerization-based switch in which InvE reuses the dimeric face to form higher-order contacts that govern the transition from translocase to effector secretion.
External linksProc Natl Acad Sci U S A / PubMed:41587314 / PubMed Central
MethodsEM (single particle)
Resolution2.42 Å
Structure data

72687

9y93

EMDB-72687, PDB-9y93:
Tetrameric InvE from Salmonella Typhimurium
Method: EM (single particle) / Resolution: 2.42 Å

Source
  • salmonella enterica subsp. enterica serovar typhimurium (bacteria)
KeywordsPROTEIN TRANSPORT / tetramer / gatekeeper protein / T3SS

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