1NQH

OUTER MEMBRANE COBALAMIN TRANSPORTER (BTUB) FROM E. COLI, WITH BOUND CALCIUM AND CYANOCOBALAMIN (VITAMIN B12) SUBSTRATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.265
  • R-Value Work: 0.224

Literature

Macromolecules
Sequence Display for 1NQH

Classification: TRANSPORT PROTEIN

Total Structure Weight: 69740.48

Macromolecule Entities
Molecule Chains Length Organism Details
VITAMIN B12 RECEPTOR A 594 Escherichia coli Gene Name(s): btuB bfe cer dcrC b3966 JW3938
Metabolic Pathways
Maps:       
Reactions:
ESCHER  BiGG

Membrane Protein

Source: inferred by homology | Group: BETA-BARREL

Subgroup Name: Beta-Barrel Membrane Proteins: Monomeric/Dimeric

Protein Name: apo BtuB cobalamin transporter


Small Molecules
Ligands 3 Unique
ID Chains Name / Formula / InChI Key 2D Diagram 3D Interactions
CNC
Query on CNC

A CO-CYANOCOBALAMIN
C63 H88 Co N14 O14 P
OEEKSCBDGPRZJZ-BYLSPCLQSA-N
Ligand Explorer NGL
 
Binding Pocket (JSmol)
 
Electron Density (JSmol)
C8E
Query on C8E

A (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
Ligand Explorer NGL
 
Binding Pocket (JSmol)
 
Electron Density (JSmol)
CA
Query on CA

A CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Ligand Explorer NGL
 
Binding Pocket (JSmol)
 
Electron Density (JSmol)

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.265
  • R-Value Work: 0.224
  • Space Group: P 31 2 1

Unit Cell:

Length (Å) Angle (°)
a = 81.69 α = 90.00
b = 81.69 β = 90.00
c = 225.81 γ = 120.00

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History

Deposition Data

  • Deposited Date: 2003-01-21
  • Released Date: 2003-04-29
  • Deposition author(s): Chimento, D.P., Mohanty, A.K., Kadner, R.J., Wiener, M.C.

Revision History

  • Version 1_0: 2003-04-29

    Type: Initial release

  • Version 1_1: 2007-10-16

    Type: Version format compliance

  • Version 1_2: 2011-07-13

    Type: Advisory, Version format compliance