5AVE image
Deposition Date 2015-06-15
Release Date 2016-03-02
Last Version Date 2024-03-20
Entry Detail
PDB ID:
5AVE
Title:
The ligand binding domain of Mlp37 with serine
Biological Source:
Source Organism:
Vibrio cholerae (Taxon ID: 666)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Methyl-accepting chemotaxis (MCP) signaling domain protein
Chain IDs:A
Chain Length:257
Number of Molecules:1
Biological Source:Vibrio cholerae
Ligand Molecules
Primary Citation
Identification of a Vibrio cholerae chemoreceptor that senses taurine and amino acids as attractants
Sci Rep 6 20866 20866 (2016)
PMID: 26878914 DOI: 10.1038/srep20866

Abstact

Vibrio cholerae, the etiological agent of cholera, was found to be attracted by taurine (2-aminoethanesulfonic acid), a major constituent of human bile. Mlp37, the closest homolog of the previously identified amino acid chemoreceptor Mlp24, was found to mediate taxis to taurine as well as L-serine, L-alanine, L-arginine, and other amino acids. Methylation of Mlp37 was enhanced upon the addition of taurine and amino acids. Isothermal titration calorimetry demonstrated that a purified periplasmic fragment of Mlp37 binds directly to taurine, L-serine, L-alanine and L-arginine. Crystal structures of the periplamic domain of Mlp37 revealed that L-serine and taurine bind to the membrane-distal PAS domain in essentially in the same way. The structural information was supported by characterising the in vivo properties of alanine-substituted mutant forms of Mlp37. The fact that the ligand-binding domain of the L-serine complex had a small opening, which would accommodate a larger R group, accounts for the broad ligand specificity of Mlp37 and allowed us to visualise ligand binding to Mlp37 with fluorescently labelled L-serine. Taken together, we conclude that Mlp37 serves as the major chemoreceptor for taurine and various amino acids.

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Primary Citation of related structures