title: Molecular organization in site-specific recombination: the catalytic domain of bacteriophage HP1 integrase at 2.7 A resolution.
abstract: HP1 integrase promotes site-specific recombination of the HP1 genome into that of Haemophilus influenzae. The isolated C-terminal domain (residues 165-337) of the protein interacts with the recombination site and contains the four catalytic residues conserved in the integrase family. This domain represents a novel fold consisting principally of well-packed alpha helices, a surface beta sheet, and an ordered 17-residue C-terminal tail. The conserved triad of basic residues and the active-site tyrosine are contributed by a single monomer and occupy fixed positions in a defined active-site cleft. Dimers are formed by mutual interactions of the tail of one monomer with an adjacent monomer; this orients active-site clefts antiparallel to each other.
authors.affiliation: Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
authors.forename: A B
authors.initials: AB
authors.lastname: Hickman
authors.forename: S
authors.initials: S
authors.lastname: Waninger
authors.forename: J J
authors.initials: JJ
authors.lastname: Scocca
authors.forename: F
authors.initials: F
authors.lastname: Dyda
mesh_terms: D000595:Amino Acid Sequence; D001435:Bacteriophages / Q000235:genetics; D001665:Binding Sites; D019281:Dimerization; D019426:Integrases / Q000737:chemistry*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D011993:Recombinant Fusion Proteins / Q000737:chemistry; D011995:Recombination, Genetic; D017421:Sequence Analysis
chemical_list: D011993:Recombinant Fusion Proteins; C060509:HP1 integrase; D019426:Integrases