9S6C | pdb_00009s6c

B12 Binding protein - BtuK1

• PDB DOI: https://doi.org/10.2210/pdb9S6C/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Bacteroides thetaiotaomicron
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-07-31 Released: 2025-09-17 
• Deposition Author(s): Clarke, C., Banasik, M., Pickersgill, R.W.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.82 Å
• R-Value Free: 
  0.192 (Depositor), 0.195 (DCC) 
• R-Value Work: 
  0.163 (Depositor), 0.164 (DCC) 

Starting Model: in silico

Literature

B12 Binding protein - BtuK1

Clarke, C., Banasik, M., Pickersgill, R.W.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Biological Assembly 3  

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

Biological assembly 3 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 116.81 kDa 
• Atom Count: 8,860 
• Modeled Residue Count: 1,013 
• Deposited Residue Count: 1,015 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Quinoprotein amine dehydrogenase-like protein	A [auth C]	337	Bacteroides thetaiotaomicron	Mutation(s): 0  Gene Names: BT_1486
UniProt
Find proteins for Q8A7N8 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / JCM 5827 / CCUG 10774 / NCTC 10582 / VPI-5482 / E50)) Explore Q8A7N8  Go to UniProtKB:  Q8A7N8

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Quinoprotein amine dehydrogenase-like protein	B [auth A], C [auth B]	339	Bacteroides thetaiotaomicron	Mutation(s): 0  Gene Names: BT_1486
UniProt
Find proteins for Q8A7N8 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / JCM 5827 / CCUG 10774 / NCTC 10582 / VPI-5482 / E50)) Explore Q8A7N8  Go to UniProtKB:  Q8A7N8

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CNC (Subject of Investigation/LOI)	D [auth C], E [auth A], F [auth B]	CYANOCOBALAMIN C63 H89 Co N14 O14 P SYZBZQWSWIJYAR-UVKKECPRSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.82 Å
• R-Value Free:  0.192 (Depositor), 0.195 (DCC) 
• R-Value Work:  0.163 (Depositor), 0.164 (DCC) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.739	α = 90
b = 129.984	β = 90
c = 164.66	γ = 90

Software Package:

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

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-09-17 
Deposition Author(s): Clarke, C., Banasik, M., Pickersgill, R.W.

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Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	--

Revision History  

• Version 1.0: 2025-09-17
  Type: Initial release