Crystal structure of tetrahedral aminopeptidase from P. horikoshii in complex with amastatin

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 

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Crystal Structure of TET Protease Reveals Complementary Protein Degradation Pathways in Prokaryotes

Borissenko, L.Groll, M.

(2005) J Mol Biol 346: 1207-1219

  • DOI: https://doi.org/10.1016/j.jmb.2004.12.056
  • Primary Citation of Related Structures:  
    1Y0R, 1Y0Y

  • PubMed Abstract: 

    Protein degradation is an essential and strictly controlled process with proteasome and functionally related proteases representing its central part. Tricorn protease (TRI) has been shown to act downstream of the proteasome, degrading produced peptides. Recently, a novel large prokaryotic aminopeptidase oligomeric complex, named TET, has been identified. This complex degrades peptides of different length in organisms where TRI is not present. We determined the crystal structure of TET from the thermophilic archaeon Pyrococcus horikoshii at 1.6 A resolution in native form and in complex with the inhibitor amastatin. We demonstrate that, beside the novel tetrahedral oligomerisation pattern, TET possesses a unique mechanism of substrate attraction and orientation. TET sequentially degrades peptides produced by the proteasome to single amino acids. Furthermore, we reconstituted in vitro the minimal protein degradation system from initial unfolding of labelled protein substrates, up to release of free amino acids. We propose that TET and TRI act as functional analogues in different organisms, with TET being more widely distributed. Thus, TET and TRI represent two evolutionarily diverged pathways of peptide degradation in prokaryotes.

  • Organizational Affiliation

    Ludwig Maximilian Universität München, Adolf Butenandt Institut, Abteilung für Physiologische Chemie, Butenandtstr.5, GebäudeB, 81377 Munich, Germany. ljudmila.borissenko@bio.med.uni-muenchen.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Frv operon protein FrvX353Pyrococcus horikoshiiMutation(s): 0 
Find proteins for O59196 (Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3))
Explore O59196 
Go to UniProtKB:  O59196
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO59196
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
AMASTATIN4N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 
  • Space Group: P 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.56α = 90
b = 111.56β = 90
c = 111.56γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-03-01
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2012-12-12
    Changes: Structure summary
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations