2IXG

Crystal structure of the ATPase domain of TAP1 with ATP (S621A, G622V, D645N mutant)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.217 

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This is version 1.2 of the entry. See complete history. 


Literature

Distinct Structural and Functional Properties of the ATPase Sites in an Asymmetric Abc Transporter.

Procko, E., Ferrin-O'Connell, I., Ng, S.-L., Gaudet, R.

(2001) Mol Cell 24: 51

  • DOI: 10.1016/j.molcel.2006.07.034
  • Primary Citation of Related Structures:  
    2IXE, 2IXF, 2IXG

  • PubMed Abstract: 

    • The ABC transporter associated with antigen processing (TAP) shuttles cytosolic peptides into the endoplasmic reticulum for loading onto class I MHC molecules. Transport is fueled by ATP binding and hydrolysis at two distinct cytosolic ATPase sites. One site comprises consensus motifs shared among most ABC transporters, while the second has substituted, degenerate motifs ...

    The ABC transporter associated with antigen processing (TAP) shuttles cytosolic peptides into the endoplasmic reticulum for loading onto class I MHC molecules. Transport is fueled by ATP binding and hydrolysis at two distinct cytosolic ATPase sites. One site comprises consensus motifs shared among most ABC transporters, while the second has substituted, degenerate motifs. Biochemical and crystallography experiments with a TAP cytosolic domain demonstrate that the consensus ATPase site has high catalytic activity and facilitates ATP-dependent dimerization of the cytosolic domains, which is an important conformational change during transport. In contrast, the degenerate site is defective in dimerization and ATP hydrolysis. Full-length TAP mutagenesis demonstrates the necessity for at least one consensus site, supporting our conclusion that the consensus site is the principal facilitator of substrate transport. Since asymmetry of the ATPase site motifs is a feature of many mammalian homologs, our proposed model has broad implications for ABC transporters.

    Organizational Affiliation: 

    Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ANTIGEN PEPTIDE TRANSPORTER 1A271Rattus norvegicusMutation(s): 3 
Gene Names: Tap1, Abcb2, Mtp1
EC: 7.4.2
UniProt
Find proteins for P36370 (Rattus norvegicus)
Explore P36370 
Go to UniProtKB:  P36370
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP36370
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP
Download Ideal Coordinates CCD File 
B [auth A]ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
C [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.217 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.477α = 90
b = 67.477β = 90
c = 105.903γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-10-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-05-08
    Changes: Data collection, Experimental preparation, Other