1VSJ

ASV INTEGRASE CORE DOMAIN WITH CD(II) COFACTORS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Binding of different divalent cations to the active site of avian sarcoma virus integrase and their effects on enzymatic activity.

Bujacz, G.Alexandratos, J.Wlodawer, A.Merkel, G.Andrake, M.Katz, R.A.Skalka, A.M.

(1997) J.Biol.Chem. 272: 18161-18168

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Retroviral integrases (INs) contain two known metal binding domains. The N-terminal domain includes a zinc finger motif and has been shown to bind Zn2+, whereas the central catalytic core domain includes a triad of acidic amino acids that bind Mn2+ o ...

    Retroviral integrases (INs) contain two known metal binding domains. The N-terminal domain includes a zinc finger motif and has been shown to bind Zn2+, whereas the central catalytic core domain includes a triad of acidic amino acids that bind Mn2+ or Mg2+, the metal cofactors required for enzymatic activity. The integration reaction occurs in two distinct steps; the first is a specific endonucleolytic cleavage step called "processing," and the second is a polynucleotide transfer or "joining" step. Our previous results showed that the metal preference for in vitro activity of avian sarcoma virus IN is Mn2+ > Mg2+ and that a single cation of either metal is coordinated by two of the three critical active site residues (Asp-64 and Asp-121) in crystals of the isolated catalytic domain. Here, we report that Ca2+, Zn2+, and Cd2+ can also bind in the active site of the catalytic domain. Furthermore, two zinc and cadmium cations are bound at the active site, with all three residues of the active site triad (Asp-64, Asp-121, and Glu-157) contributing to their coordination. These results are consistent with a two-metal mechanism for catalysis by retroviral integrases. We also show that Zn2+ can serve as a cofactor for the endonucleolytic reactions catalyzed by either the full-length protein, a derivative lacking the N-terminal domain, or the isolated catalytic domain of avian sarcoma virus IN. However, polynucleotidyl transferase activities are severely impaired or undetectable in the presence of Zn2+. Thus, although the processing and joining steps of integrase employ a similar mechanism and the same active site triad, they can be clearly distinguished by their metal preferences.


    Organizational Affiliation

    Macromolecular Structure Laboratory, NCI-Frederick Cancer Research and Development Center, ABL-Basic Research Program, Frederick, Maryland 21702, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INTEGRASE
A
152Rous sarcoma virus (strain Schmidt-Ruppin B)Mutation(s): 0 
Gene Names: gag-pol
Find proteins for O92956 (Rous sarcoma virus (strain Schmidt-Ruppin B))
Go to UniProtKB:  O92956
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download SDF File 
Download CCD File 
A
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
HEPES
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
CD
Query on CD

Download SDF File 
Download CCD File 
A
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
OCY
Query on OCY
A
L-PEPTIDE LINKINGC5 H11 N O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.175 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 66.330α = 90.00
b = 66.330β = 90.00
c = 80.920γ = 90.00
Software Package:
Software NamePurpose
PROFFTrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-05-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance