Integrase mediates integration of a DNA copy of the viral genome into the host chromosome. Integrase is composed of three domains. The amino-terminal domain is a zinc binding domain. The central domain is the catalytic domain Pfam:PF00665. This domain is the carboxyl terminal domain that is a non-specific DNA binding domain [1].

1: Solution structure of the DNA binding domain of HIV-1 integrase. Lodi PJ, Ernst JA, Kuszewski J, Hickman AB, Engelman A, Craigie R, Clore GM, Gronenborn AM; Biochemistry 1995;34:9826-9833. PMID:7632683