PDBsum entry 5exs

Transcription

PDB id: 5exs

Contents

Protein chain

252 a.a.

Ligands

AGS

Waters ×148

PDB id:

5exs

Name:

Transcription

Title:

Aaa+ atpase fleq from pseudomonas aeruginosa bound to atp-gamma-s

Structure:

Transcriptional regulator fleq. Chain: a. Fragment: unp residues 137-394. Engineered: yes

Source:

Pseudomonas aeruginosa. Organism_taxid: 208964. Strain: atcc 15692 / pao1 / 1c / prs 101 / lmg 12228. Gene: fleq, pa1097. Expressed in: escherichia coli. Expression_system_taxid: 469008.

Resolution:

2.50Å R-factor: 0.180 R-free: 0.229

Authors:

M.V.A.S.Navarro,H.Sondermann,B.Matsuyama

Key ref:

B.Y.Matsuyama et al. (2016). Mechanistic insights into c-di-GMP-dependent control of the biofilm regulator FleQ from Pseudomonas aeruginosa. Proc Natl Acad Sci U S A, 113, E209. PubMed id: 26712005 DOI: 10.1073/pnas.1523148113

Date:

24-Nov-15 Release date: 13-Jan-16

Protein chain

G3XCV0  (G3XCV0_PSEAE) -  Transcriptional regulator FleQ from Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)

Seq: 490 a.a.

Struc: 252 a.a.

Enzyme reactions

• Enzyme class: E.C.?

DOI no: 10.1073/pnas.1523148113

Proc Natl Acad Sci U S A 113:E209 (2016)

PubMed id: 26712005

Mechanistic insights into c-di-GMP-dependent control of the biofilm regulator FleQ from Pseudomonas aeruginosa.

B.Y.Matsuyama, P.V.Krasteva, C.Baraquet, C.S.Harwood, H.Sondermann, M.V.Navarro.

ABSTRACT

Bacterial biofilm formation during chronic infections confers increased fitness, antibiotic tolerance, and cytotoxicity. In many pathogens, the transition from a planktonic lifestyle to collaborative, sessile biofilms represents a regulated process orchestrated by the intracellular second-messenger c-di-GMP. A main effector for c-di-GMP signaling in the opportunistic pathogen Pseudomonas aeruginosa is the transcription regulator FleQ. FleQ is a bacterial enhancer-binding protein (bEBP) with a central AAA+ ATPase σ(54)-interaction domain, flanked by a C-terminal helix-turn-helix DNA-binding motif and a divergent N-terminal receiver domain. Together with a second ATPase, FleN, FleQ regulates the expression of flagellar and exopolysaccharide biosynthesis genes in response to cellular c-di-GMP. Here we report structural and functional data that reveal an unexpected mode of c-di-GMP recognition that is associated with major conformational rearrangements in FleQ. Crystal structures of FleQ's AAA+ ATPase domain in its apo-state or bound to ADP or ATP-γ-S show conformations reminiscent of the activated ring-shaped assemblies of other bEBPs. As revealed by the structure of c-di-GMP-complexed FleQ, the second messenger interacts with the AAA+ ATPase domain at a site distinct from the ATP binding pocket. c-di-GMP interaction leads to active site obstruction, hexameric ring destabilization, and discrete quaternary structure transitions. Solution and cell-based studies confirm coupling of the ATPase active site and c-di-GMP binding, as well as the functional significance of crystallographic interprotomer interfaces. Taken together, our data offer unprecedented insight into conserved regulatory mechanisms of gene expression under direct c-di-GMP control via FleQ and FleQ-like bEBPs.