Structure of an amidohydrolase from Chromobacterium violaceum (EFI target EFI-500202) with bound Mn, AMP and phosphate.

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 

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Prospecting for Unannotated Enzymes: Discovery of a 3',5'-Nucleotide Bisphosphate Phosphatase within the Amidohydrolase Superfamily.

Cummings, J.A.Vetting, M.W.Ghodge, S.V.Xu, C.Hillerich, B.Seidel, R.D.Almo, S.C.Raushel, F.M.

(2014) Biochemistry 53: 591

  • DOI: https://doi.org/10.1021/bi401640r
  • Primary Citation of Related Structures:  
    2YB1, 2YB4

  • PubMed Abstract: 

    In bacteria, 3',5'-adenosine bisphosphate (pAp) is generated from 3'-phosphoadenosine 5'-phosphosulfate in the sulfate assimilation pathway, and from coenzyme A by the transfer of the phosphopantetheine group to the acyl-carrier protein. pAp is subsequently hydrolyzed to 5'-AMP and orthophosphate, and this reaction has been shown to be important for superoxide stress tolerance. Herein, we report the discovery of the first instance of an enzyme from the amidohydrolase superfamily that is capable of hydrolyzing pAp. Crystal structures of Cv1693 from Chromobacterium violaceum have been determined to a resolution of 1.9 Å with AMP and orthophosphate bound in the active site. The enzyme has a trinuclear metal center in the active site with three Mn(2+) ions. This enzyme (Cv1693) belongs to the Cluster of Orthologous Groups cog0613 from the polymerase and histidinol phosphatase family of enzymes. The values of kcat and kcat/Km for the hydrolysis of pAp are 22 s(-1) and 1.4 × 10(6) M(-1) s(-1), respectively. The enzyme is promiscuous and is able to hydrolyze other 3',5'-bisphosphonucleotides (pGp, pCp, pUp, and pIp) and 2'-deoxynucleotides with comparable catalytic efficiency. The enzyme is capable of hydrolyzing short oligonucleotides (pdA)5, albeit at rates much lower than that of pAp. Enzymes from two other enzyme families have previously been found to hydrolyze pAp at physiologically significant rates. These enzymes include CysQ from Escherichia coli (cog1218) and YtqI/NrnA from Bacillus subtilis (cog0618). Identification of the functional homologues to the experimentally verified pAp phosphatases from cog0613, cog1218, and cog0618 suggests that there is relatively little overlap of enzymes with this function in sequenced bacterial genomes.

  • Organizational Affiliation

    Department of Chemistry, Texas A&M University , College Station, Texas 77843, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AMIDOHYDROLASE292Chromobacterium violaceumMutation(s): 0 
Find proteins for Q7NXD4 (Chromobacterium violaceum (strain ATCC 12472 / DSM 30191 / JCM 1249 / NBRC 12614 / NCIMB 9131 / NCTC 9757))
Explore Q7NXD4 
Go to UniProtKB:  Q7NXD4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7NXD4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.958α = 90
b = 46.765β = 90
c = 130.785γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-16
    Type: Initial release
  • Version 1.1: 2014-01-22
    Changes: Database references, Version format compliance
  • Version 1.2: 2014-02-12
    Changes: Database references
  • Version 1.3: 2017-07-05
    Changes: Data collection
  • Version 1.4: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other