7OKO image
Deposition Date 2021-05-18
Release Date 2021-12-08
Last Version Date 2024-07-10
Entry Detail
PDB ID:
7OKO
Keywords:
MEMBRANE PROTEIN
Title:
Structure of the outer-membrane core complex (outer ring) from a conjugative type IV secretion system
Biological Source:
Source Organism:
Salmonella enterica (Taxon ID: 28901)
Salmonella enterica subsp. salamae serovar 58:l,z13,z28:z6 (Taxon ID: 1160778)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7OKO validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Type-F conjugative transfer system secretin TraK
Gene (Uniprot):traK
Chain IDs:G (auth: 3), H (auth: 4), L (auth: 8), M (auth: 9), N (auth: A), O (auth: B), S (auth: F), T (auth: G), X (auth: K), Y (auth: L), CA (auth: P), DA (auth: Q), HA (auth: U), IA (auth: V), MA (auth: Z), NA (auth: a), RA (auth: e), SA (auth: f), WA (auth: j), XA (auth: k), BB (auth: o), CB (auth: p), GB (auth: t), HB (auth: u), LB (auth: y), MB (auth: z)
Chain Length:216
Number of Molecules:26
Biological Source:Salmonella enterica subsp. salamae serovar 58:l,z13,z28:z6
UniProt ID:A0A734HNY4 Pfam ID:PF06586
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Type IV conjugative transfer system lipoprotein TraV
Gene (Uniprot):traV
Chain IDs:A (auth: AA), B (auth: AB), D (auth: 0), E (auth: 1), I (auth: 5), J (auth: 6), P (auth: C), Q (auth: D), U (auth: H), V (auth: I), Z (auth: M), AA (auth: N), EA (auth: R), FA (auth: S), JA (auth: W), KA (auth: X), OA (auth: b), PA (auth: c), TA (auth: g), UA (auth: h), YA (auth: l), ZA (auth: m), DB (auth: q), EB (auth: r), IB (auth: v), JB (auth: w)
Chain Length:204
Number of Molecules:26
Biological Source:Salmonella enterica
UniProt ID:A0A753A8N9 Pfam ID:PF09676
Polymer Type:polypeptide(L)
Molecule:TraB
Chain IDs:C (auth: AC), F (auth: 2), K (auth: 7), R (auth: E), W (auth: J), BA (auth: O), GA (auth: T), LA (auth: Y), QA (auth: d), VA (auth: i), AB (auth: n), FB (auth: s), KB (auth: x)
Chain Length:10
Number of Molecules:13
Biological Source:Salmonella enterica
Ligand Molecules
NA
Primary Citation
Architecture of the outer-membrane core complex from a conjugative type IV secretion system.
Nat Commun 12 6834 6834 (2021)
PMID: 34824240 DOI: 10.1038/s41467-021-27178-8

Abstact

Conjugation is one of the most important processes that bacteria utilize to spread antibiotic resistance genes among bacterial populations. Interbacterial DNA transfer requires a large double membrane-spanning nanomachine called the type 4 secretion system (T4SS) made up of the inner-membrane complex (IMC), the outer-membrane core complex (OMCC) and the conjugative pilus. The iconic F plasmid-encoded T4SS has been central in understanding conjugation for several decades, however atomic details of its structure are not known. Here, we report the structure of a complete conjugative OMCC encoded by the pED208 plasmid from E. coli, solved by cryo-electron microscopy at 3.3 Å resolution. This 2.1 MDa complex has a unique arrangement with two radial concentric rings, each having a different symmetry eventually contributing to remarkable differences in protein stoichiometry and flexibility in comparison to other OMCCs. Our structure suggests that F-OMCC is a highly dynamic complex, with implications for pilus extension and retraction during conjugation.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
7OKO