9MA1 | pdb_00009ma1

Crystal structure of MctB from Mycobacterium tuberculosis at 3.25 Angstroms resolution

• PDB DOI: https://doi.org/10.2210/pdb9MA1/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Mycobacterium tuberculosis CDC1551
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-03-13 Released: 2026-03-18 
• Deposition Author(s): Sun, D.M., Chen, L., Wu, M.H., Zang, J.Y., Tian, C.L.
• Funding Organization(s): National Science Foundation (NSF, China)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.25 Å
• R-Value Free: 
  0.297 (Depositor), 0.307 (DCC) 
• R-Value Work: 
  0.232 (Depositor), 0.235 (DCC) 
• R-Value Observed: 
  0.235 (Depositor) 

Starting Model: experimental

Literature

Crystal structure of MctB from Mycobacterium tuberculosis at 2.3 Angstroms resolution

Sun, D.M., Chen, L., Wu, M.H., Zang, J.Y., Tian, C.L.

To be published.

Biological Assembly 1  

Global Symmetry: Dihedral - D4  (Explore in 3D)
Global Stoichiometry: Homo 16-mer - A16 

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

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 61.86 kDa 
• Atom Count: 3,841 
• Modeled Residue Count: 560 
• Deposited Residue Count: 594 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Copper transporter MctB	A [auth C], B [auth A]	297	Mycobacterium tuberculosis CDC1551	Mutation(s): 0  Gene Names: mctB, MT1737
UniProt
Find proteins for P9WJ82 (Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh)) Explore P9WJ82  Go to UniProtKB:  P9WJ82

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.25 Å
• R-Value Free:  0.297 (Depositor), 0.307 (DCC) 
• R-Value Work:  0.232 (Depositor), 0.235 (DCC) 
• R-Value Observed: 0.235 (Depositor) 

Space Group: P 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 121.793	α = 90
b = 121.793	β = 90
c = 88.458	γ = 90

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-03-18 
Deposition Author(s): Sun, D.M., Chen, L., Wu, M.H., Zang, J.Y., Tian, C.L.

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Funding Organization	Location	Grant Number
National Science Foundation (NSF, China)	China	--

Revision History  

• Version 1.0: 2026-03-18
  Type: Initial release