3ZUX

Crystal structure of a bacterial homologue of the bile acid sodium symporter ASBT.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Crystal Structure of a Bacterial Homologue of the Bile Acid Sodium Symporter Asbt.

Hu, N.-J., Iwata, S., Cameron, A.D., Drew, D.

(2011) Nature 478: 408

  • DOI: 10.1038/nature10450
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • High cholesterol levels greatly increase the risk of cardiovascular disease. About 50 per cent of cholesterol is eliminated from the body by its conversion into bile acids. However, bile acids released from the bile duct are constantly recycled, bein ...

    High cholesterol levels greatly increase the risk of cardiovascular disease. About 50 per cent of cholesterol is eliminated from the body by its conversion into bile acids. However, bile acids released from the bile duct are constantly recycled, being reabsorbed in the intestine by the apical sodium-dependent bile acid transporter (ASBT, also known as SLC10A2). It has been shown in animal models that plasma cholesterol levels are considerably lowered by specific inhibitors of ASBT, and ASBT is thus a target for hypercholesterolaemia drugs. Here we report the crystal structure of a bacterial homologue of ASBT from Neisseria meningitidis (ASBT(NM)) at 2.2 Å. ASBT(NM) contains two inverted structural repeats of five transmembrane helices. A core domain of six helices harbours two sodium ions, and the remaining four helices pack in a row to form a flat, 'panel'-like domain. Overall, the architecture of the protein is remarkably similar to the sodium/proton antiporter NhaA, despite having no detectable sequence homology. The ASBT(NM) structure was captured with the substrate taurocholate present, bound between the core and panel domains in a large, inward-facing, hydrophobic cavity. Residues near this cavity have been shown to affect the binding of specific inhibitors of human ASBT. The position of the taurocholate molecule, together with the molecular architecture, suggests the rudiments of a possible transport mechanism.

    Organizational Affiliation: 

    Division of Molecular Biosciences, Imperial College London, London SW7 2AZ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSPORTER
A
332Neisseria meningitidis serogroup B (strain MC58)Mutation(s): 1 
Membrane protein
mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Apical Sodium-Dependent Bile Acid Transporters (ASBT)		Protein: 
Bacterial homologue of ASBT (ASBTNM) with bound taurocholate
Find proteins for Q9K0A9 (Neisseria meningitidis serogroup B (strain MC58))
Go to UniProtKB:  Q9K0A9
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA
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Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
TCH
Query on TCH
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Download CCD File 
A
TAUROCHOLIC ACID
C26 H45 N O7 S
WBWWGRHZICKQGZ-HZAMXZRMSA-N
 Ligand Interaction
LDA
Query on LDA
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Download CCD File 
A
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
 Ligand Interaction
PTY
Query on PTY
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Download CCD File 
A
PHOSPHATIDYLETHANOLAMINE
C40 H80 N O8 P
NJGIRBISCGPRPF-KXQOOQHDSA-N
 Ligand Interaction
HG
Query on HG
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Download CCD File 
A
MERCURY (II) ION
Hg
BQPIGGFYSBELGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.197 
  • Space Group: P 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 73.330α = 90.00
b = 73.330β = 90.00
c = 163.520γ = 90.00
Software Package:
Software NamePurpose
SHARPphasing
MOSFLMdata reduction
SCALAdata scaling
BUSTERrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-10-12
    Type: Initial release
  • Version 1.1: 2011-10-26
    Type: Database references, Structure summary