Crystal structure of AQ_1354, a hypothetical protein from Aquifex aeolicus

Experimental Data Snapshot

  • Resolution: 1.89 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 

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This is version 1.3 of the entry. See complete history


Structure of the hypothetical protein AQ_1354 from Aquifex aeolicus.

Oganesyan, V.Busso, D.Brandsen, J.Chen, S.Jancarik, J.Kim, R.Kim, S.H.

(2003) Acta Crystallogr D Biol Crystallogr 59: 1219-1223

  • DOI: https://doi.org/10.1107/s0907444903011028
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of a hypothetical protein AQ_1354 (gi 2983779) from the hyperthermophilic bacteria Aquifex aeolicus has been determined using X-ray crystallography. As found in many structural genomics studies, this protein is not associated with any known function based on its amino-acid sequence. PSI-BLAST analysis against a non-redundant sequence database gave 68 similar sequences referred to as 'conserved hypothetical proteins' from the uncharacterized protein family UPF0054 (accession No. PF02310). Crystallographic analysis revealed that the overall fold of this protein consists of one central alpha-helix surrounded by a four-stranded beta-sheet and four other alpha-helices. Structure-based homology analysis with DALI revealed that the structure has a moderate to good resemblance to metal-dependent proteinases such as collagenases and gelatinases, thus suggesting its possible molecular function. However, experimental tests for collagenase and gelatinase-type function show no detectable activity under standard assay conditions. Therefore, we suggest either that the members of the UPF0054 family have a similar fold but different biochemical functions to those of collagenases and gelatinases or that they have a similar function but perform it under different conditions.

  • Organizational Affiliation

    Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hypothetical protein AQ_1354150Aquifex aeolicusMutation(s): 0 
Find proteins for O67367 (Aquifex aeolicus (strain VF5))
Explore O67367 
Go to UniProtKB:  O67367
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67367
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.89 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.018α = 90
b = 58.018β = 90
c = 110.255γ = 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: 2003-09-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references