Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 28.58 kDa 
• Atom Count: 2072 
• Modelled Residue Count: 251 
• Deposited Residue Count: 260 
• Unique protein chains: 1

1JJ7

Crystal Structure of the C-terminal ATPase domain of human TAP1

• PDB DOI: 10.2210/pdb1JJ7/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2001-07-03 Released: 2001-09-12 
• Deposition Author(s): Gaudet, R., Wiley, D.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.240 
• R-Value Work: 0.198 
• R-Value Observed: 0.198 

Literature

Structure of the ABC ATPase domain of human TAP1, the transporter associated with antigen processing.

Gaudet, R., Wiley, D.C.

(2001) EMBO J 20: 4964-4972

• PubMed: 11532960 
• DOI: 10.1093/emboj/20.17.4964
• Primary Citation of Related Structures:  
  1JJ7


• PubMed Abstract: 
  

The transporter associated with antigen processing (TAP) is an ABC transporter formed of two subunits, TAP1 and TAP2, each of which has an N-terminal membrane-spanning domain and a C-terminal ABC ATPase domain. We report the structure of the C-terminal ABC ATPase domain of TAP1 (cTAP1) bound to ADP. cTAP1 forms an L-shaped molecule with two domains, a RecA-like domain and a small alpha-helical domain. The diphosphate group of ADP interacts with the P-loop as expected. Residues thought to be involved in gamma-phosphate binding and hydrolysis show flexibility in the ADP-bound state as evidenced by their high B-factors. Comparisons of cTAP1 with other ABC ATPases from the ABC transporter family as well as ABC ATPases involved in DNA maintenance and repair reveal key regions and residues specific to each family. Three ATPase subfamilies are identified which have distinct adenosine recognition motifs, as well as distinct subdomains that may be specific to the different functions of each subfamily. Differences between TAP1 and TAP2 in the nucleotide-binding site may be related to the observed asymmetry during peptide transport.

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Organizational Affiliation: 

Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, Harvard University, 7 Divinity Avenue, Cambridge, MA 02138, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PEPTIDE TRANSPORTER TAP1	A	260	Homo sapiens	Mutation(s): 0  Gene Names: TAP1, ABCB2, PSF1, RING4, Y3 EC: 7.4.2
UniProt & NIH Common Fund Data Resources
Find proteins for Q03518 (Homo sapiens) Explore Q03518  Go to UniProtKB:  Q03518
PHAROS:  Q03518 GTEx:  ENSG00000168394

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	C [auth A]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.240 
• R-Value Work: 0.198 
• R-Value Observed: 0.198 
• Space Group: P 6₂

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 87.57	α = 90
b = 87.57	β = 90
c = 79.85	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
XDS	data reduction
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-07-03 
• Released Date: 2001-09-12 
Deposition Author(s): Gaudet, R., Wiley, D.C.

Revision History  

• Version 1.0: 2001-09-12
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-04
  Changes: Advisory, Refinement description