2MX0

Solution structure of HP0268 from Helicobacter pylori


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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Literature

Structure-based functional identification of Helicobacter pylori HP0268 as a nuclease with both DNA nicking and RNase activities

Lee, K.Y.Lee, K.Y.Kim, J.H.Lee, I.G.Lee, S.H.Sim, D.W.Won, H.S.Lee, B.J.

(2015) Nucleic Acids Res 43: 5194-5207

  • DOI: 10.1093/nar/gkv348
  • Primary Citation of Related Structures:  
    2MX0

  • PubMed Abstract: 
  • HP0268 is a conserved, uncharacterized protein from Helicobacter pylori. Here, we determined the solution structure of HP0268 using three-dimensional nuclear magnetic resonance (NMR) spectroscopy, revealing that this protein is structurally most similar to a small MutS-related (SMR) domain that exhibits nicking endonuclease activity ...

    HP0268 is a conserved, uncharacterized protein from Helicobacter pylori. Here, we determined the solution structure of HP0268 using three-dimensional nuclear magnetic resonance (NMR) spectroscopy, revealing that this protein is structurally most similar to a small MutS-related (SMR) domain that exhibits nicking endonuclease activity. We also demonstrated for the first time that HP0268 is a nicking endonuclease and a purine-specific ribonuclease through gel electrophoresis and fluorescence spectroscopy. The nuclease activities for DNA and RNA were maximally increased by Mn(2+) and Mg(2+) ions, respectively, and decreased by Cu(2+) ions. Using NMR chemical shift perturbations, the metal and nucleotide binding sites of HP0268 were determined to be spatially divided but close to each other. The lysine residues (Lys7, Lys11 and Lys43) are clustered and form the nucleotide binding site. Moreover, site-directed mutagenesis was used to define the catalytic active site of HP0268, revealing that this site contains two acidic residues, Asp50 and Glu54, in the metal binding site. The nucleotide binding and active sites are not conserved in the structural homologues of HP0268. This study will contribute to improving our understanding of the structure and functionality of a wide spectrum of nucleases.


    Organizational Affiliation

    Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea lbj@nmr.snu.ac.kr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Uncharacterized protein HP_0268A82Helicobacter pylori 26695Mutation(s): 0 
Gene Names: HP_0268
Find proteins for O25047 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore O25047 
Go to UniProtKB:  O25047
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2MX0 Olderado

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2014-12-05 
  • Released Date: 2015-12-09 
  • Deposition Author(s): Lee, K.Y.

Revision History 

  • Version 1.0: 2015-12-09
    Type: Initial release