9J6C | pdb_00009j6c

Crystal structure of an oxidoreductase mutant M4 from Streptomyces aureocirculatus

• PDB DOI: https://doi.org/10.2210/pdb9J6C/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Streptomyces aureocirculatus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-08-15 Released: 2025-09-03 
• Deposition Author(s): Li, Q., Xu, Z.F., Feng, J.H., Liu, X.T., Liu, W.D., Yao, P.Y., Wu, Q.Q., Zhu, D.M.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.32 Å
• R-Value Free: 
  0.241 (Depositor), 0.242 (DCC) 
• R-Value Work: 
  0.218 (Depositor), 0.227 (DCC) 
• R-Value Observed: 
  0.220 (Depositor) 

Starting Model: in silico

Literature

Asymmetric synthesis of chiral N-substituted amino amides and esters with two chiral centers by imine reductase-catalyzed dynamic kinetic resolution via reductive amination

Xu, Z., Feng, J., Liu, X., Li, Q., Liu, W., Yao, P., Wu, Q., Zhu, D.

(2025) Chin J Catal 77: 144-152

• DOI: https://doi.org/10.1016/S1872-2067(25)64769-3

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content 

• Total Structure Weight: 64.54 kDa 
• Atom Count: 4,234 
• Modeled Residue Count: 574 
• Deposited Residue Count: 622 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
IR104M4	A, B	311	Streptomyces aureocirculatus	Mutation(s): 0
UniProt
Find proteins for A0A6L6X851 (Streptomyces typhae) Explore A0A6L6X851  Go to UniProtKB:  A0A6L6X851

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.32 Å
• R-Value Free:  0.241 (Depositor), 0.242 (DCC) 
• R-Value Work:  0.218 (Depositor), 0.227 (DCC) 
• R-Value Observed: 0.220 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.65	α = 90
b = 100.958	β = 112.3
c = 86.91	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
XDS	data reduction
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-09-03 
Deposition Author(s): Li, Q., Xu, Z.F., Feng, J.H., Liu, X.T., Liu, W.D., Yao, P.Y., Wu, Q.Q., Zhu, D.M.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	--

Revision History  

• Version 1.0: 2025-09-03
  Type: Initial release
  
• Version 1.1: 2026-03-18
  Changes: Database references