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TitleStructural characterization and functional insights into the type II secretion system of the poly-extremophile Deinococcus radiodurans.
Journal, issue, pagesJ Biol Chem, Vol. 300, Issue 2, Page 105537, Year 2024
Publish dateDec 10, 2023
AuthorsDomenica Farci / Stefan Milenkovic / Luca Iesu / Marta Tanas / Matteo Ceccarelli / Dario Piano /
PubMed AbstractThe 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) ...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.
External linksJ Biol Chem / PubMed:38072042 / PubMed Central
MethodsEM (single particle)
Resolution2.56 Å
Structure data

16770

8co1

EMDB-16770, PDB-8co1:
Type II Secretion System
Method: EM (single particle) / Resolution: 2.56 Å

Source
  • Deinococcus radiodurans R1 (radioresistant)
  • deinococcus radiodurans r1 = atcc 13939 = dsm 20539 (radioresistant)
KeywordsMEMBRANE PROTEIN / Type II Secretion System / Cell envelope

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