5XGD

Crystal structure of the PAS-GGDEF-EAL domain of PA0861 from Pseudomonas aeruginosa in complex with GTP

DOI: 10.2210/pdb5XGD/pdb

Classification: TRANSCRIPTION
Organism(s): Pseudomonas aeruginosa PAO1
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2017-04-13 Released: 2017-12-20
Deposition Author(s): Liu, C., Liew, C.W., Sreekanth, R., Lescar, J.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.80 Å
R-Value Free: 0.252
R-Value Work: 0.177
R-Value Observed: 0.181

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Insights into Biofilm Dispersal Regulation from the Crystal Structure of the PAS-GGDEF-EAL Region of RbdA from Pseudomonas aeruginosa.

Liu, C., Liew, C.W., Wong, Y.H., Tan, S.T., Poh, W.H., Manimekalai, M.S.S., Rajan, S., Xin, L., Liang, Z.X., Gruber, G., Rice, S.A., Lescar, J.

(2018) J Bacteriol 200

PubMed: 29109186 Search on PubMedSearch on PubMed Central
DOI: 10.1128/JB.00515-17
Primary Citation of Related Structures:
5XGB, 5XGE, 5XGD

PubMed Abstract:

RbdA is a positive r egulator of b iofilm d ispersal of Pseudomonas aeruginosa Its cytoplasmic region (cRbdA) comprises an N-terminal Per-ARNT-Sim (PAS) domain followed by a diguanylate cyclase (GGDEF) domain and an EAL domain, whose phosphodiesterase activity is allosterically stimulated by GTP binding to the GGDEF domain. We report crystal structures of cRbdA and of two binary complexes: one with GTP/Mg ²⁺ bound to the GGDEF active site and one with the EAL domain bound to the c-di-GMP substrate. These structures unveil a 2-fold symmetric dimer stabilized by a closely packed N-terminal PAS domain and a noncanonical EAL dimer. The autoinhibitory switch is formed by an α-helix (S-helix) immediately N-terminal to the GGDEF domain that interacts with the EAL dimerization helix (α _6-E) of the other EAL monomer and maintains the protein in a locked conformation. We propose that local conformational changes in cRbdA upon GTP binding lead to a structure with the PAS domain and S-helix shifted away from the GGDEF-EAL domains, as suggested by small-angle X-ray scattering (SAXS) experiments. Domain reorientation should be facilitated by the presence of an α-helical lever (H-helix) that tethers the GGDEF and EAL regions, allowing the EAL domain to rearrange into an active dimeric conformation. IMPORTANCE Biofilm formation by bacterial pathogens increases resistance to antibiotics. RbdA positively regulates biofilm dispersal of Pseudomonas aeruginosa The crystal structures of the cytoplasmic region of the RbdA protein presented here reveal that two evolutionarily conserved helices play an important role in regulating the activity of RbdA, with implications for other GGDEF-EAL dual domains that are abundant in the proteomes of several bacterial pathogens. Thus, this work may assist in the development of small molecules that promote bacterial biofilm dispersal.

Organizational Affiliation:

Nanyang Institute of Structural Biology, Nanyang Technological University, Singapore, Singapore.

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Uncharacterized protein PA0861	A	568	Pseudomonas aeruginosa PAO1	Mutation(s): 0 Gene Names: PA0861
Find proteins for Q9I580 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Explore Q9I580 Go to UniProtKB: Q9I580
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
GTP Query on GTP Download Ideal Coordinates CCD File SDF format, chain B [A] MOL2 format, chain B [A]	A	GUANOSINE-5'-TRIPHOSPHATE C₁₀ H₁₆ N₅ O₁₄ P₃ XKMLYUALXHKNFT-UUOKFMHZSA-N		Ligand Interaction
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain C [A] MOL2 format, chain C [A]	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Ligand Interaction