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The retroviral attachment (att ) sites at viral DNA ends arecis -acting regions essential for proviral integration. To investigate the sequence features ofatt important for human immunodeficiency virus type 1 (HIV-1) integration in vivo, we generated a series of 25att mutants of HIV-1 by mutagenesis of the U3, U5, or both boundaries ofatt . Our results indicated that the terminal 11 or 12 bp of viral DNA are sufficient for specific recognition by HIV-1 integrase (IN) and suggested that IN might recognize eachatt site independently in vivo.

Specific and Independent Recognition of U3 and U5 att Sites by Human Immunodeficiency Virus Type 1 Integrase In Vivo