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Document 0317
DOCN M9610317
TI High-resolution structure of the catalytic domain of avian sarcoma virus
integrase.
DT 9601
AU Bujacz G; Jaskolski M; Alexandratos J; Wlodawer A; Merkel G; Katz RA;
Skalka AM; Macromolecular Structure Laboratory, NCI-Frederick Cancer;
Research and Development Center, MD 21702, USA.
SO J Mol Biol. 1995 Oct 20;253(2):333-46. Unique Identifier : AIDSLINE
MED/96036765
AB Retroviral integrase (IN) functions to insert retroviral DNA into the
host cell chromosome in a highly coordinated manner. IN catalyzes two
biochemically separable reactions: processing of the viral DNA ends and
joining of these ends to the host DNA. Previous studies suggested that
these two reactions are chemically similar and are carried out by a
single active site that is characterized by a highly conserved
constellation of carboxylate residues, the D,D(35)E motif. We report
here the crystal structure of the isolated catalytic domain of avian
sarcoma virus (ASV) IN, solved using multiwavelength anomalous
diffraction data for a selenomethionine derivative and refined at 1.7 A
resolution. The protein is a crystallographic dimer with each monomer
featuring a five-stranded mixed beta-sheet region surrounded by five
alpha-helices. Based on the general fold and the arrangement of
catalytic carboxylate residues, it is apparent that ASV IN is a member
of a superfamily of proteins that also includes two types of nucleases,
RuvC and RNase H. The general fold and the dimer interface are similar
to those of the analogous domain of HIV-1 IN, whose crystal structure
has been determined at 2.5 A resolution. However, the ASV IN structure
is more complete in that all three critical carboxylic acids, Asp64,
Asp121 and Glu157, are ordered. The ordered active site and the
considerably higher resolution of the present structure are all
important to an understanding of the mechanism of retroviral DNA
integration, as well as for designing antiviral agents that may be
effective against HIV.
DE Amino Acid Sequence Aspartic Acid Bacterial Proteins/CHEMISTRY
Binding Sites Comparative Study Crystallization Crystallography,
X-Ray DNA Nucleotidyltransferases/*CHEMISTRY/ISOLATION & PURIF/
METABOLISM Endodeoxyribonucleases/CHEMISTRY Glutamic Acid
HIV/ENZYMOLOGY Macromolecular Systems Models, Molecular Molecular
Sequence Data *Protein Folding *Protein Structure, Secondary
Ribonuclease H, Calf Thymus/CHEMISTRY Sarcoma Viruses,
Avian/*ENZYMOLOGY Sequence Homology, Amino Acid Support, Non-U.S.
Gov't Support, U.S. Gov't, P.H.S. Virus Integration JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).