6EXE image
Entry Detail
PDB ID:
6EXE
Keywords:
Title:
Crystal structure of DotM cytoplasmic domain (residues 153-380),R217E
Biological Source:
PDB Version:
Deposition Date:
2017-11-08
Release Date:
2018-02-14
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 65
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:IcmP (DotM)
Chain IDs:A, B
Chain Length:235
Number of Molecules:2
Biological Source:Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513)
Primary Citation
Legionella DotM structure reveals a role in effector recruiting to the Type 4B secretion system.
Nat Commun 9 507 507 (2018)
PMID: 29410427 DOI: 10.1038/s41467-017-02578-x

Abstact

Legionella pneumophila, a causative agent of pneumonia, utilizes the Type 4B secretion (T4BS) system to translocate over 300 effectors into the host cell during infection. T4BS systems are encoded by a large gene cluster termed dot/icm, three components of which, DotL, DotM, and DotN, form the "coupling complex", which serves as a platform for recruitment of effector proteins. One class of effectors includes proteins containing Glu-rich/E-block sequences at their C terminus. However, the protein or region of the coupling complex mediating recruitment of such effectors is unknown. Here we present the crystal structure of DotM. This all alpha-helical structure exhibits patches of positively charged residues. We show that these regions form binding sites for acidic Glu-rich peptides and that mutants targeting these patches are defective in vivo in the translocation of acidic Glu-rich motif-containing effectors. We conclude that DotM forms the interacting surface for recruitment of acidic Glu-rich motif-containing Legionella effectors.

Legend

Protein

Chemical

Disease

Primary Citation of related structures