3IQB

Tt I75F/L144F H-NOX

• PDB DOI: https://doi.org/10.2210/pdb3IQB/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Caldanaerobacter subterraneus subsp. tengcongensis
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2009-08-19 Released: 2010-01-19 
• Deposition Author(s): Weinert, E.E., Plate, L., Whited, C.A., Olea Jr, C., Marletta, M.A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.239 
• R-Value Work: 0.213 
• R-Value Observed: 0.214 

Literature

Determinants of Ligand Affinity and Heme Reactivity in H-NOX Domains.

Weinert, E.E., Plate, L., Whited, C.A., Olea, C., Marletta, M.A.

(2009) Angew Chem Int Ed Engl 49: 720-723

• PubMed: 20017169 
• DOI: https://doi.org/10.1002/anie.200904799
• Primary Citation of Related Structures:  
  3IQB

---

Organizational Affiliation: 

California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 22.86 kDa 
• Atom Count: 1,664 
• Modelled Residue Count: 188 
• Deposited Residue Count: 188 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Methyl-accepting chemotaxis protein	A	188	Caldanaerobacter subterraneus subsp. tengcongensis	Mutation(s): 2  Gene Names: Tar4, TTE0680
UniProt
Find proteins for Q8RBX6 (Caldanaerobacter subterraneus subsp. tengcongensis (strain DSM 15242 / JCM 11007 / NBRC 100824 / MB4)) Explore Q8RBX6  Go to UniProtKB:  Q8RBX6

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	B [auth A]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
SO4	D [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
OXY	C [auth A]	OXYGEN MOLECULE O2 MYMOFIZGZYHOMD-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.239 
• R-Value Work: 0.213 
• R-Value Observed: 0.214 
• Space Group: P 6₄ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 75.49	α = 90
b = 75.49	β = 90
c = 174.978	γ = 120

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHASER	phasing
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-01-19 
Deposition Author(s): Weinert, E.E., Plate, L., Whited, C.A., Olea Jr, C., Marletta, M.A.

Revision History  

• Version 1.0: 2010-01-19
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2021-10-13
  Changes: Database references, Derived calculations
• Version 1.3: 2023-09-06
  Changes: Data collection, Refinement description