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TitleProteins DotY and DotZ modulate the dynamics and localization of the type IVB coupling complex of Legionella pneumophila.
Journal, issue, pagesMol Microbiol, Vol. 117, Issue 2, Page 307-319, Year 2022
Publish dateDec 6, 2021
AuthorsKevin Macé / Amit Meir / Natalya Lukoyanova / Luying Liu / David Chetrit / Manuela K Hospenthal / Craig R Roy / Gabriel Waksman /
PubMed AbstractLegionella pneumophila is an opportunistic pathogen infecting alveolar macrophages and protozoa species. Legionella utilizes a Type IV Secretion System (T4SS) to translocate over 300 effector ...Legionella pneumophila is an opportunistic pathogen infecting alveolar macrophages and protozoa species. Legionella utilizes a Type IV Secretion System (T4SS) to translocate over 300 effector proteins into its host cell. In a recent study, we have isolated and solved the cryo-EM structure of the Type IV Coupling Complex (T4CC), a large cytoplasmic determinant associated with the inner membrane that recruits effector proteins for delivery to the T4SS for translocation. The T4CC is composed of a DotLMNYZ hetero-pentameric core from which the flexible IcmSW module flexibly protrudes. The DotY and DotZ proteins were newly reported members of this complex and their role remained elusive. In this study, we observed the effect of deleting DotY and DotZ on T4CC stability and localization. Furthermore, we found these two proteins are co-dependent, whereby the deletion of DotY resulted in DotZ absence from the coupling complex, and vice versa. Additional cryo-EM data analysis revealed the dynamic movement of the IcmSW module is modified by the DotY/Z proteins. We therefore determined the likely function of DotY and DotZ and revealed their importance on T4CC function.
External linksMol Microbiol / PubMed:34816517 / PubMed Central
MethodsEM (single particle)
Resolution3.61 - 15.0 Å
Structure data

13083

7ovb

EMDB-13083, PDB-7ovb:
L. pneumophila Type IV Coupling Complex (T4CC) with density for DotY N-terminal and middle domains
Method: EM (single particle) / Resolution: 3.61 Å

EMDB-13858:
L. pneumophila Type IV Coupling Complex (T4CC) computed from WT particles where DotY/Z is missing (referred to as T4CCWTminusYZ at 6.3A)
Method: EM (single particle) / Resolution: 6.3 Å

EMDB-13859:
L. pneumophila Type IV Coupling Complex (T4CC) computed from a sample where dotY/Z genes were deleted (referred to as T4CCdeltaDotYZ at 15A)
Method: EM (single particle) / Resolution: 15.0 Å

Chemicals

ChemComp-ZN:
Unknown entry

Source
  • legionella pneumophila subsp. pneumophila str. philadelphia 1 (bacteria)
  • Legionella pneumophila subsp. pneumophila str. Philadelphia 1
  • Legionella pneumophila (bacteria)
KeywordsMEMBRANE PROTEIN / Type IV Coupling Complex / T4CC / Type IV Secretion System / T4SS / Membrane protein complex / Membrane complex / DotY / DotZ / DotL / DotM / DotN / IcmSW / Legionella

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