4R9U image
Deposition Date 2014-09-08
Release Date 2014-11-19
Last Version Date 2024-11-20
Entry Detail
PDB ID:
4R9U
Keywords:
HYDROLASE
Title:
Structure of vitamin B12 transporter BtuCD in a nucleotide-bound outward facing state
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 83333)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.79 Å
R-Value Free:
0.24
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 1 2 1
4R9U validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Vitamin B12 import system permease protein BtuC
Gene (Uniprot):btuC
Mutations:C18S, C32S, C120S, C156S, C205S, C206S, C267S
Chain IDs:A, B
Chain Length:333
Number of Molecules:2
Biological Source:Escherichia coli
UniProt ID:P06609 Pfam ID:PF01032 EC:7.6.2.8
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Vitamin B12 import ATP-binding protein BtuD
Gene (Uniprot):btuD
Mutations:C180S, E159Q, N162C
Chain IDs:C, D
Chain Length:249
Number of Molecules:2
Biological Source:Escherichia coli
UniProt ID:P06611 Pfam ID:PF00005 EC:7.6.2.8
Ligand Molecules
ANP
LDA
MG
Primary Citation
Structure of AMP-PNP-bound BtuCD and mechanism of ATP-powered vitamin B12 transport by BtuCD-F.
Nat.Struct.Mol.Biol. 21 1097 1099 (2014)
PMID: 25402482 DOI: 10.1038/nsmb.2918

Abstact

The reaction mechanism of BtuCD-F-catalyzed vitamin B12 transport into Escherichia coli is currently unclear. Here we present the structure of the last missing state in the form of AMP-PNP-bound BtuCD, trapped by a disulfide cross-link. Our structural and biochemical data allow a consistent mechanism to be formulated, thus rationalizing the roles of substrate, ATP and substrate-binding protein.

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Primary Citation of related structures
4R9U