5Y6F image
Entry Detail
PDB ID:
5Y6F
Keywords:
Title:
Crystal structure of YcgR in complex with c-di-GMP from Escherichia coli
Biological Source:
PDB Version:
Deposition Date:
2017-08-11
Release Date:
2018-07-18
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Flagellar brake protein YcgR
Chain IDs:A
Chain Length:257
Number of Molecules:1
Biological Source:Escherichia coli (strain K12)
Primary Citation
Structural insights into the mechanism of c-di-GMP-bound YcgR regulating flagellar motility inEscherichia coli.
J.Biol.Chem. 295 808 821 (2020)
PMID: 31836667 DOI: 10.1074/jbc.RA119.009739

Abstact

The motile-sessile transition is critical for bacterial survival and growth. Cyclic-di-GMP (c-di-GMP) plays a central role in controlling this transition and regulating biofilm formation via various effectors. As an effector of c-di-GMP in Escherichia coli and related species, the PilZ domain-containing protein YcgR responds to elevated c-di-GMP concentrations and acts on the flagellar motor to suppress bacterial motility in a brakelike fashion, which promotes bacterial surface attachment. To date, several target proteins within the motor, MotA, FliG, and FliM, along with different regulatory mechanisms have been reported. However, how YcgR acts on these components remains unclear. Here, we report that activated YcgR stably binds to MotA at the MotA-FliG interface and thereby regulates bacterial swimming. Biochemical and structural analyses revealed that c-di-GMP rearranges the PilZ domain configuration, resulting in the formation of a MotA-binding patch consisting of an RXXXR motif and the C-tail helix α3. Moreover, we noted that a conserved region in the YcgR-N domain, which is independent of MotA interaction, is necessary for motility regulation. On the basis of these findings, we infer that the YcgR-N domain is required for activity on other motor proteins. We propose that activated YcgR appends to MotA via its PilZ domain and thereby interrupts the MotA-FliG interaction and simultaneously interacts with other motor proteins via its YcgR-N domain to inhibit flagellar motility. Our findings suggest that the mode of interaction between YcgR and motor proteins may be shared by other PilZ family proteins.

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