6S3U image
Entry Detail
PDB ID:
6S3U
Keywords:
Title:
Adhesin P140 from Mycoplasma Genitalium
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2019-06-26
Release Date:
2020-06-24
Method Details:
Experimental Method:
Resolution:
3.24 Å
R-Value Free:
0.20
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Adhesin P1
Chain IDs:A, B, C, D, E, F
Chain Length:1304
Number of Molecules:6
Biological Source:Mycoplasma genitalium G37
Ligand Molecules
Primary Citation
Structure and mechanism of the Nap adhesion complex from the human pathogen Mycoplasma genitalium.
Nat Commun 11 2877 2877 (2020)
PMID: 32513917 DOI: 10.1038/s41467-020-16511-2

Abstact

Mycoplasma genitalium is a human pathogen adhering to host target epithelial cells and causing urethritis, cervicitis and pelvic inflammatory disease. Essential for infectivity is a transmembrane adhesion complex called Nap comprising proteins P110 and P140. Here we report the crystal structure of P140 both alone and in complex with the N-terminal domain of P110. By cryo-electron microscopy (cryo-EM) and tomography (cryo-ET) we find closed and open Nap conformations, determined at 9.8 and 15 Å, respectively. Both crystal structures and the cryo-EM structure are found in a closed conformation, where the sialic acid binding site in P110 is occluded. By contrast, the cryo-ET structure shows an open conformation, where the binding site is accessible. Structural information, in combination with functional studies, suggests a mechanism for attachment and release of M. genitalium to and from the host cell receptor, in which Nap conformations alternate to sustain motility and guarantee infectivity.

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Primary Citation of related structures