11BM | pdb_000011bm

Crystal structure of MrtR bound to 3O-C8 homoserine lactone

• PDB DOI: https://doi.org/10.2210/pdb11BM/pdb

• Classification: TRANSCRIPTION
• Organism(s): Mesorhizobium tianshanense
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2026-02-16 Released: 2026-09-23 
• Deposition Author(s): Stoutland, I.M., Bingman, C.A., Elias, M.H., Blackwell, H.E.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.44 Å
• R-Value Free: 
  0.232 (Depositor), 0.240 (DCC) 
• R-Value Work: 
  0.182 (Depositor), 0.191 (DCC) 

Starting Model: in silico

Literature

MrtR of Mesorhizobium tianshanense reveals both activation and inhibition mechanisms of a LuxR-type quorum sensing receptor.

Stoutland, I.M., Blackwell, H.E.

(2026) Proc Natl Acad Sci U S A 

• DOI: https://doi.org/10.1073/pnas.2616692123

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: cross-linking

Macromolecule Content 

• Total Structure Weight: 27.73 kDa 
• Atom Count: 2,121 
• Modeled Residue Count: 233 
• Deposited Residue Count: 241 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MrtR	A	241	Mesorhizobium tianshanense	Mutation(s): 0  Gene Names: mrtR
UniProt
Find proteins for Q45NF4 (Mesorhizobium tianshanense) Explore Q45NF4  Go to UniProtKB:  Q45NF4

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
LAE (Subject of Investigation/LOI)	B [auth A]	3-OXO-OCTANOIC ACID (2-OXO-TETRAHYDRO-FURAN-3-YL)-AMIDE C12 H19 N O4 FXCMGCFNLNFLSH-JTQLQIEISA-N
PEG	C [auth A], D [auth A]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.44 Å
• R-Value Free:  0.232 (Depositor), 0.240 (DCC) 
• R-Value Work:  0.182 (Depositor), 0.191 (DCC) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 126.334	α = 90
b = 35.554	β = 112.512
c = 61.964	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
autoPROC	data reduction
autoPROC	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-09-23 
Deposition Author(s): Stoutland, I.M., Bingman, C.A., Elias, M.H., Blackwell, H.E.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	2R35GM131817-06

Revision History  

• Version 1.0: 2026-09-23
  Type: Initial release