7X6F

Outer membrane lipoprotein QseG of Escherichia coli O157:H7

PDB DOI: https://doi.org/10.2210/pdb7X6F/pdb

Classification: SIGNALING PROTEIN
Organism(s): Escherichia coli O157:H7
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No
Membrane Protein: Yes mpstruc

Deposited: 2022-03-07 Released: 2023-03-15
Deposition Author(s): Matsumoto, K., Fukuda, Y., Inoue, T.
Funding Organization(s): Japan Society for the Promotion of Science (JSPS)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.30 Å
R-Value Free: 0.274
R-Value Work: 0.221

wwPDB Validation 3D Report Full Report

This is version 1.1 of the entry. See complete history.

Literature

Crystal structures of QseE and QseG: elements of a three-component system from Escherichia coli.

Matsumoto, K., Fukuda, Y., Inoue, T.

(2023) Acta Crystallogr F Struct Biol Commun 79: 285-293

PubMed: 37877621 Search on PubMedSearch on PubMed Central
DOI: https://doi.org/10.1107/S2053230X23009123
Primary Citation of Related Structures:
7X6F, 7X6G, 7X6H, 8JWD

PubMed Abstract:
Bacteria regulate virulence by using two-component systems (TCSs) composed of a histidine kinase (HK) and a response regulator (RR). TCSs respond to environmental signals and change gene-expression levels. The HK QseE and the RR QseF regulate the virulence of Enterobacteriaceae bacteria such as enterohemorrhagic Escherichia coli. The operon encoding QseE/QseF also contains a gene encoding an outer membrane lipoprotein, qseG. The protein product QseG interacts with QseE in the periplasmic space to control the activity of QseE and constitutes a unique QseE/F/G three-component system. However, the structural bases of their functions are unknown. Here, crystal structures of the periplasmic regions of QseE and QseG were determined with the help of AlphaFold models. The periplasmic region of QseE has a helix-bundle structure as found in some HKs. The QseG structure is composed of an N-terminal globular domain and a long C-terminal helix forming a coiled-coil-like structure that contributes to dimerization. Comparison of QseG structures obtained from several crystallization conditions shows that QseG has structural polymorphisms at the C-terminus of the coiled-coil structure, indicating that the C-terminus is flexible. The C-terminal flexibility is derived from conserved hydrophilic residues that reduce the hydrophobic interaction at the coiled-coil interface. Electrostatic surface analysis suggests that the C-terminal coiled-coil region can interact with QseE. The observed structural fluctuation of the C-terminus of QseG is probably important for interaction with QseE.

Organizational Affiliation

Graduate School of Pharmaceutical Science, Osaka University, Yamadaoka 1-6, Suita, Osaka 565-0871, Japan.

Macromolecule Content

Total Structure Weight: 123.4 kDa
Atom Count: 7,708
Modelled Residue Count: 883
Deposited Residue Count: 1,050
Unique protein chains: 1

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Quorum-sensing regulator protein G	A, B, C, D, E A, B, C, D, E, F	175	Escherichia coli O157:H7	Mutation(s): 0 Gene Names: qseG, yfhG, Z3831, ECs3421 Membrane Entity: Yes
UniProt
Find proteins for P0AD45 (Escherichia coli O157:H7) Explore P0AD45 Go to UniProtKB: P0AD45
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P0AD45
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
FLC Query on FLC Download Ideal Coordinates CCD File SDF format, chain M [auth C] SDF format, chain P [auth D] MOL2 format, chain M [auth C] MOL2 format, chain P [auth D]	M [auth C], P [auth D]	CITRATE ANION C₆ H₅ O₇ KRKNYBCHXYNGOX-UHFFFAOYSA-K		Interactions Focus chain M [auth C] Focus chain P [auth D] Interactions & Density Focus chain M [auth C] Focus chain P [auth D]
SER Query on SER Download Ideal Coordinates CCD File SDF format, chain I [auth B] MOL2 format, chain I [auth B]	I [auth B]	SERINE C₃ H₇ N O₃ MTCFGRXMJLQNBG-REOHCLBHSA-N		Interactions Focus chain I [auth B] Interactions & Density Focus chain I [auth B]
EDO Query on EDO Download Ideal Coordinates CCD File SDF format, chain H [auth A] SDF format, chain L [auth C] MOL2 format, chain H [auth A] MOL2 format, chain L [auth C]	H [auth A], L [auth C]	1,2-ETHANEDIOL C₂ H₆ O₂ LYCAIKOWRPUZTN-UHFFFAOYSA-N		Interactions Focus chain H [auth A] Focus chain L [auth C] Interactions & Density Focus chain H [auth A] Focus chain L [auth C]
ACT Query on ACT Download Ideal Coordinates CCD File SDF format, chain G [auth A] SDF format, chain J [auth B] SDF format, chain K [auth C] SDF format, chain O [auth D] MOL2 format, chain G [auth A] MOL2 format, chain J [auth B] MOL2 format, chain K [auth C] MOL2 format, chain O [auth D]	G [auth A], J [auth B], K [auth C], O [auth D]	ACETATE ION C₂ H₃ O₂ QTBSBXVTEAMEQO-UHFFFAOYSA-M		Interactions Focus chain G [auth A] Focus chain J [auth B] Focus chain K [auth C] Focus chain O [auth D] Interactions & Density Focus chain G [auth A] Focus chain J [auth B] Focus chain K [auth C] Focus chain O [auth D]
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain N [auth C] MOL2 format, chain N [auth C]	N [auth C]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain N [auth C] Interactions & Density Focus chain N [auth C]