4NSP

Crystal structure of human ENDOV


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.210 

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This is version 1.1 of the entry. See complete history


Literature

Structure of human endonuclease V as an inosine-specific ribonuclease.

Zhang, Z.Hao, Z.Wang, Z.Li, Q.Xie, W.

(2014) Acta Crystallogr D Biol Crystallogr 70: 2286-2294

  • DOI: 10.1107/S139900471401356X
  • Primary Citation of Related Structures:  
    4NSP

  • PubMed Abstract: 
  • The 6-aminopurine ring of adenosine (A) can be deaminated to form the 6-oxopurine of inosine (I). Endonuclease Vs (EndoVs) are inosine-specific nucleases that cleave at the second phosphodiester bond 3' to inosine. EndoV proteins are highly conserved ...

    The 6-aminopurine ring of adenosine (A) can be deaminated to form the 6-oxopurine of inosine (I). Endonuclease Vs (EndoVs) are inosine-specific nucleases that cleave at the second phosphodiester bond 3' to inosine. EndoV proteins are highly conserved in all domains of life, but the bacterial and human enzymes seem to display distinct substrate preferences. While the bacterial enzymes exhibit high cleavage efficiency on various nucleic acid substrates, human EndoV (hEndoV) is most active towards ssRNA but is much less active towards other substrates. However, the structural basis of substrate recognition by hEndoV is not well understood. In this study, the 2.3 Å resolution crystal structure of hEndoV was determined and its unusual RNA-cleaving properties were investigated. The enzyme preserves the general `RNase H-like' structure, especially in the wedge motif, the metal-binding site and the hypoxanthine-binding pocket. hEndoV also features several extra insertions and a characteristic four-cysteine motif, in which Cys227 and Cys228, two cysteines that are highly conserved in higher eukaryotes, play important roles in catalysis. The structure presented here helps in understanding the substrate preference of hEndoV catalysis.


    Organizational Affiliation

    Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory for Biocontrol, School of Life Sciences, The Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Endonuclease VA250Homo sapiensMutation(s): 0 
Gene Names: ENDOV
EC: 3.1.26
Find proteins for Q8N8Q3 (Homo sapiens)
Explore Q8N8Q3 
Go to UniProtKB:  Q8N8Q3
NIH Common Fund Data Resources
PHAROS  Q8N8Q3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.210 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.75α = 90
b = 48.713β = 90
c = 108.531γ = 90
Software Package:
Software NamePurpose
CrysalisProdata collection
PHASERphasing
PHENIXrefinement
CrysalisProdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-10
    Type: Initial release
  • Version 1.1: 2014-09-24
    Changes: Database references