2AYI

Wild-type AmpT from Thermus thermophilus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.70 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.308 
  • R-Value Observed: 0.308 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Substrate Access to the Active Sites in Aminopeptidase T, a Representative of a New Metallopeptidase Clan.

Odintsov, S.G.Sabala, I.Bourenkov, G.Rybin, V.Bochtler, M.

(2005) J Mol Biol 354: 403-412

  • DOI: 10.1016/j.jmb.2005.09.042
  • Primary Citation of Related Structures:  
    2AYI

  • PubMed Abstract: 
  • Aminopeptidase T (AmpT) from Thermus thermophilus is a metalloexopeptidase with no similarity to prototypical metallopeptidases with an HExxH or HxxEH motif. The crystal structure of the Staphylococcus aureus homologue of AmpT, which is known as aminopeptidase S (AmpS), has been reported recently ...

    Aminopeptidase T (AmpT) from Thermus thermophilus is a metalloexopeptidase with no similarity to prototypical metallopeptidases with an HExxH or HxxEH motif. The crystal structure of the Staphylococcus aureus homologue of AmpT, which is known as aminopeptidase S (AmpS), has been reported recently. This structure revealed a dimeric protein with a very unusual, elongated shape and a large internal cavity. The active sites were found on the inner walls of the cavity and were entirely shielded from the environment, which suggested either that the dimer in the crystals was not physiologically relevant, or that an inactive conformation had been crystallized. Here, we show by gel-filtration and analytical ultracentrifugation that AmpT, like AmpS, forms dimers in solution, and we present the structure of AmpT in a crystal form with five protomers in the asymmetric unit. The five protomers take conformations that range from fully closed, as in the AmpS structure, to nearly open, so that the active site is almost directly accessible. The different conformations indicate flexibility between the AmpT N and C-domains, and explain how AmpT can be active, although the unusual AmpS dimerization mode applies to AmpT as well.


    Organizational Affiliation

    International Institute of Molecular and Cell Biology, ul. Trojdena 4, 02-109 Warsaw, Poland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aminopeptidase TA, B, C, D, E408Thermus thermophilusMutation(s): 0 
Gene Names: AmpT
EC: 3.4.11
Find proteins for P42778 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Explore P42778 
Go to UniProtKB:  P42778
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.70 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.308 
  • R-Value Observed: 0.308 
  • Space Group: P 42
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 246.472α = 90
b = 246.472β = 90
c = 51.135γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-08
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description