3PVI

D34G MUTANT OF PVUII ENDONUCLEASE COMPLEXED WITH COGNATE DNA SHOWS THAT ASP34 IS DIRECTLY INVOLVED IN DNA RECOGNITION AND INDIRECTLY INVOLVED IN CATALYSIS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.59 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 

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This is version 1.2 of the entry. See complete history. 


Literature

Asp34 of PvuII endonuclease is directly involved in DNA minor groove recognition and indirectly involved in catalysis.

Horton, J.R., Nastri, H.G., Riggs, P.D., Cheng, X.

(1998) J Mol Biol 284: 1491-1504

  • DOI: 10.1006/jmbi.1998.2269
  • Primary Citation of Related Structures:  
    3PVI

  • PubMed Abstract: 

    • The PvuII restriction endonuclease is a homodimer that recognizes and cleaves the DNA sequence 5'-CAGCTG-3' in double-stranded DNA, and the structure of this enzyme has been reported. In the wild-type enzyme, Asp34 interacts with the internal guanine of the recognition sequence on the minor groove side ...

    The PvuII restriction endonuclease is a homodimer that recognizes and cleaves the DNA sequence 5'-CAGCTG-3' in double-stranded DNA, and the structure of this enzyme has been reported. In the wild-type enzyme, Asp34 interacts with the internal guanine of the recognition sequence on the minor groove side. The Asp34 codon was altered to specify Gly (D34G), and in vitro studies have revealed that the D34G protein has lost binding specificity for the central G.C base-pairs, and that it cuts the canonical sequence with 10(-4)-fold reduced activity as compared to the wild-type enzyme. We have now determined the structure at 1.59 A resolution of the D34G PvuII endonuclease complexed with a 12 bp duplex deoxyoligonucleotide containing the cognate sequence. The D34G alteration results in several structural changes relative to wild-type protein/DNA complexes. First, the sugar moiety of the internal guanine changes from a C2'-endo to C3'-endo pucker while that of the 3' guanine changes from C3'-endo to C2'-endo pucker. Second, the axial rise between the internal G.C base-pairs is reduced while that between the G.C and flanking base-pairs is expanded. Third, two distinct monomeric active sites are observed that we refer to as being "primed" and "unprimed" for phosphodiester bond cleavage. The primed and unprimed sites differ in the conformation of the Asp58 side-chain, and in the absence from unprimed sites of four networked water molecules. These water molecules, present in the primed site, have been implicated in the catalytic mechanism of this and other endonucleases; some of them can be replaced by the Mg2+ necessary for cleavage. Taken together, these structural changes imply that the Asp34 side-chains from the two subunits maintain a distinct conformation of its DNA substrate, properly situating the target backbone phosphates and indirectly manipulating the active sites. This provides some insight into how recognition of the specific DNA sequence is linked to catalysis by the highly specific restriction endonucleases, and reveals one way in which the structural conformation of the DNA is modulated coordinately with that of the PvuII protein.

    Related Citations: 
    • Structure of PvuII Endonuclease with Cognate DNA
      Cheng, X., Balendiran, K., Schildkraut, I., Anderson, J.E.
      (1994) EMBO J 13: 3927
    • Expression, Purification, and Crystallization of Restriction Endonuclease PvuII with DNA Containing its Recognition Site
      Balendiran, K., Bonventre, J., Knott, R., Jack, W., Benner, J., Schildkraut, I., Anderson, J.E.
      (1994) Proteins 19: 77
    Organizational Affiliation: 

    Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, GA, 30322, USA.



Macromolecules

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(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (PVUII ENDONUCLEASE)C [auth A],
D [auth B]		157Proteus vulgarisMutation(s): 1 
EC: 3.1.21.4
UniProt
Find proteins for P23657 (Proteus hauseri)
Explore P23657 
Go to UniProtKB:  P23657
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23657
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*GP*AP*CP*CP*AP*GP*CP*TP*GP*GP*TP*C)-3')A [auth C],
B [auth D]		13N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.59 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.8α = 90
b = 86.3β = 90
c = 48.5γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-10-14
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance