3HFX

Crystal structure of carnitine transporter


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.262 

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Literature

Crystal structure of the carnitine transporter and insights into the antiport mechanism

Tang, L.Bai, L.Wang, W.-H.Jiang, T.

(2010) Nat Struct Mol Biol 17: 492-496

  • DOI: 10.1038/nsmb.1788
  • Primary Citation of Related Structures:  
    3HFX

  • PubMed Abstract: 
  • CaiT is a membrane antiporter that catalyzes the exchange of L-carnitine with gamma-butyrobetaine across the Escherichia coli membrane. To obtain structural insights into the antiport mechanism, we solved the crystal structure of CaiT at a resolution of 3 ...

    CaiT is a membrane antiporter that catalyzes the exchange of L-carnitine with gamma-butyrobetaine across the Escherichia coli membrane. To obtain structural insights into the antiport mechanism, we solved the crystal structure of CaiT at a resolution of 3.15 A. We crystallized CaiT as a homotrimer complex, in which each protomer contained 12 transmembrane helices and 4 l-carnitine molecules outlining the transport pathway across the membrane. Mutagenesis studies revealed a primary binding site at the center of the protein and a secondary substrate-binding site at the bottom of the intracellular vestibule. These results, together with the insights obtained from structural comparison with structurally homologous transporters, provide mechanistic insights into the association between substrate translocation and the conformational changes of CaiT.


    Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
L-carnitine/gamma-butyrobetaine antiporterA504Escherichia coli K-12Mutation(s): 0 
Gene Names: caiTyaaPb0040JW0039
Membrane Entity: Yes 
UniProt
Find proteins for P31553 (Escherichia coli (strain K12))
Explore P31553 
Go to UniProtKB:  P31553
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31553
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.262 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 134.21α = 90
b = 134.21β = 90
c = 85γ = 120
Software Package:
Software NamePurpose
SHARPphasing
REFMACrefinement
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance