5TCP image
Deposition Date 2016-09-15
Release Date 2016-12-21
Last Version Date 2024-03-13
Entry Detail
PDB ID:
5TCP
Title:
Near-atomic resolution cryo-EM structure of the periplasmic domains of PrgH and PrgK
Biological Source:
Method Details:
Experimental Method:
Resolution:
4.30 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Lipoprotein PrgK
Gene (Uniprot):prgK
Chain IDs:A (auth: 0), C (auth: 2), E (auth: 4), G (auth: 6), I (auth: 8), L (auth: B), N (auth: D), P (auth: F), R (auth: H), T (auth: J), V (auth: L), X (auth: N), Z (auth: P), BA (auth: R), DA (auth: T), FA (auth: V), HA (auth: X), JA (auth: Z), KA (auth: a), MA (auth: c), OA (auth: e), QA (auth: g), SA (auth: i), UA (auth: k)
Chain Length:235
Number of Molecules:24
Biological Source:Salmonella enterica subsp. enterica serovar Typhimurium
Polymer Type:polypeptide(L)
Molecule:Protein PrgH
Gene (Uniprot):prgH
Chain IDs:B (auth: 1), D (auth: 3), F (auth: 5), H (auth: 7), J (auth: 9), K (auth: A), M (auth: C), O (auth: E), Q (auth: G), S (auth: I), U (auth: K), W (auth: M), Y (auth: O), AA (auth: Q), CA (auth: S), EA (auth: U), GA (auth: W), IA (auth: Y), LA (auth: b), NA (auth: d), PA (auth: f), RA (auth: h), TA (auth: j), VA (auth: l)
Chain Length:263
Number of Molecules:24
Biological Source:Salmonella enterica subsp. enterica serovar Typhimurium
Ligand Molecules
Primary Citation
Near-atomic-resolution cryo-EM analysis of the Salmonella T3S injectisome basal body.
Nature 540 597 601 (2016)
PMID: 27974800 DOI: 10.1038/nature20576

Abstact

The type III secretion (T3S) injectisome is a specialized protein nanomachine that is critical for the pathogenicity of many Gram-negative bacteria, including purveyors of plague, typhoid fever, whooping cough, sexually transmitted infections and major nosocomial infections. This syringe-shaped 3.5-MDa macromolecular assembly spans both bacterial membranes and that of the infected host cell. The internal channel formed by the injectisome allows for the direct delivery of partially unfolded virulence effectors into the host cytoplasm. The structural foundation of the injectisome is the basal body, a molecular lock-nut structure composed predominantly of three proteins that form highly oligomerized concentric rings spanning the inner and outer membranes. Here we present the structure of the prototypical Salmonella enterica serovar Typhimurium pathogenicity island 1 basal body, determined using single-particle cryo-electron microscopy, with the inner-membrane-ring and outer-membrane-ring oligomers defined at 4.3 Å and 3.6 Å resolution, respectively. This work presents the first, to our knowledge, high-resolution structural characterization of the major components of the basal body in the assembled state, including that of the widespread class of outer-membrane portals known as secretins.

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