Crystal structure analysis of an amidase from Nesterenkonia sp.

Experimental Data Snapshot

  • Resolution: 1.66 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

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This is version 1.3 of the entry. See complete history


Unique aliphatic amidase from a psychrotrophic and haloalkaliphilic nesterenkonia isolate.

Nel, A.J.Tuffin, I.M.Sewell, B.T.Cowan, D.A.

(2011) Appl Environ Microbiol 77: 3696-3702

  • DOI: https://doi.org/10.1128/AEM.02726-10
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Nesterenkonia strain AN1 was isolated from a screening program for nitrile- and amide-hydrolyzing microorganisms in Antarctic desert soil samples. Strain AN1 showed significant 16S rRNA sequence identity to known members of the genus. Like known Nesterenkonia species, strain AN1 was obligately alkaliphilic (optimum environmental pH, 9 to 10) and halotolerant (optimum environmental Na(+) content, 0 to 15% [wt/vol]) but was also shown to be an obligate psychrophile with optimum growth at approximately 21°C. The partially sequenced genome of AN1 revealed an open reading frame (ORF) encoding a putative protein member of the nitrilase superfamily, referred to as NitN (264 amino acids). The protein crystallized readily as a dimer and the atomic structure of all but 10 amino acids of the protein was determined, confirming that the enzyme had an active site and a fold characteristic of the nitrilase superfamily. The protein was screened for activity against a variety of nitrile, carbamoyl, and amide substrates and was found to have only amidase activity. It had highest affinity for propionamide but demonstrated a low catalytic rate. NitN had maximal activity at 30°C and between pH 6.5 and 7.5, conditions which are outside the optimum growth range for the organism.

  • Organizational Affiliation

    Institute for Microbial Biotechnology and Metagenomics, Department of Biotechnology, University of the Western Cape, Private Bag X17, Bellville 7535, Cape Town, South Africa.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amidase283Nesterenkonia sp. 10004Mutation(s): 0 
Gene Names: Nit2
Find proteins for D0VWZ1 (Nesterenkonia sp. 10004)
Explore D0VWZ1 
Go to UniProtKB:  D0VWZ1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD0VWZ1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.66 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.999α = 90
b = 115.639β = 90
c = 65.321γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
MxCuBEdata collection
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2013-02-20
    Changes: Database references, Other
  • Version 1.3: 2023-09-06
    Changes: Data collection, Database references, Refinement description