8CO1 image
Deposition Date 2023-02-26
Release Date 2024-04-10
Last Version Date 2025-07-09
Entry Detail
PDB ID:
8CO1
Keywords:
MEMBRANE PROTEIN
Title:
Type II Secretion System
Biological Source:
Source Organism:
Deinococcus radiodurans R1 = ATCC 13939 = DSM 20539 (Taxon ID: 243230)
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
2.56 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
8CO1 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Probable type IV piliation system protein DR_0774
Gene (Uniprot):DR_0774
Chain IDs:A (auth: Q1), D (auth: P1), G (auth: O1), J (auth: N1), M (auth: M1), P (auth: L1), S (auth: A1), V (auth: I1), Y (auth: H1), BA (auth: F1), EA (auth: G1), HA (auth: E1), KA (auth: D1), NA (auth: C1), QA (auth: B1)
Chain Length:740
Number of Molecules:15
Biological Source:Deinococcus radiodurans R1 = ATCC 13939 = DSM 20539
UniProt ID:Q9RW95 Pfam ID:PF03958, PF00263
Protein Blast
Polymer Type:polypeptide(L)
Molecule:IPT/TIG domain-containing protein
Gene (Uniprot):DR_1364
Chain IDs:B (auth: Q2), E (auth: P2), H (auth: O2), K (auth: N2), N (auth: M2), Q (auth: L2), T (auth: A2), W (auth: I2), Z (auth: H2), CA (auth: F2), FA (auth: G2), IA (auth: E2), LA (auth: D2), OA (auth: C2), RA (auth: B2)
Chain Length:155
Number of Molecules:15
Biological Source:Deinococcus radiodurans R1 = ATCC 13939 = DSM 20539
UniProt ID:Q9RUM0 Pfam ID:PF01833
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Lipoprotein
Gene (Uniprot):DR_0940
Chain IDs:C (auth: Q3), F (auth: P3), I (auth: O3), L (auth: N3), O (auth: M3), R (auth: L3), U (auth: A3), X (auth: I3), AA (auth: H3), DA (auth: F3), GA (auth: G3), JA (auth: E3), MA (auth: D3), PA (auth: C3), SA (auth: B3)
Chain Length:208
Number of Molecules:15
Biological Source:Deinococcus radiodurans R1 = ATCC 13939 = DSM 20539
UniProt ID:Q9RVT2
Ligand Molecules
NA
Primary Citation
Structural characterization and functional insights into the type II secretion system of the poly-extremophile Deinococcus radiodurans.
J.Biol.Chem. 300 105537 105537 (2024)
PMID: 38072042 DOI: 10.1016/j.jbc.2023.105537

Abstact

The extremophile bacterium D. radiodurans boasts a distinctive cell envelope characterized by the regular arrangement of three protein complexes. Among these, the Type II Secretion System (T2SS) stands out as a pivotal structural component. We used cryo-electron microscopy to reveal unique features, such as an unconventional protein belt (DR_1364) around the main secretin (GspD), and a cap (DR_0940) found to be a separated subunit rather than integrated with GspD. Furthermore, a novel region at the N-terminus of the GspD constitutes an additional second gate, supplementing the one typically found in the outer membrane region. This T2SS was found to contribute to envelope integrity, while also playing a role in nucleic acid and nutrient trafficking. Studies on intact cell envelopes show a consistent T2SS structure repetition, highlighting its significance within the cellular framework.

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Primary Citation of related structures
8CO1