Nucleic Acids Research, Vol 26, Issue 19 4347-4355, Copyright © 1998 by Oxford University Press
A Gravel, B Fournier and PH Roy
Integrons are genetic elements that are able to capture genes by a site-
specific recombination mechanism. Integrons contain a gene coding for a
lambda-like integrase that carries out site-specific recombination by
interacting with two different target sites; the attI site and the
palindromic sequence attC (59 base element). Cassette integrations usually
involve the attI site, while cassette excisions use attC . Therefore, the
integrase should bind both sites to cleave DNA and perform site-specific
recombination reactions. We have used purified maltose-binding protein
fused with the integrase (MBP-IntI1) and native IntI1 protein and gel
retardation assays with fragments containing the complete and partial attI1
site to show formation of four complexes in this region. Chemical
modification of specific nucleotides within the attI1 site was used to
investigate their interference with binding of the integrase protein. We
attribute IntI1 specific binding to four regions in the attI1 site and a
GTTA consensus sequence is found in three of the four regions. Interference
by modified guanine and thymine residues in the DNA major groove and
adenine residues in the minor groove were observed, indicating that the
integrase interacts with both sides of the helix. Binding of IntI1 to attC
is also discussed.
ARTICLES
DNA complexes obtained with the integron integrase IntI1 at the attI1 site
Centre de Recherche en Infectiologie, Centre Hospitalier de l'Universite Laval and Departement de Biochimie,Faculte des Sciences et de Genie, Universite Laval, Sainte-Foy, Quebec G1V 4G2, Canada.
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