title: Identification of the LEDGF/p75 binding site in HIV-1 integrase.
abstract: Lens epithelium-derived growth factor (LEDGF)/p75 is an important cellular co-factor for human immunodeficiency virus (HIV) replication. We originally identified LEDGF/p75 as a binding partner of integrase (IN) in human cells. The interaction has been mapped to the integrase-binding domain (IBD) of LEDGF/p75 located in the C-terminal part. We have subsequently shown that IN carrying the Q168A mutation remains enzymatically active but is impaired for interaction with LEDGF/p75. To map the integrase/LEDGF interface in more detail, we have now identified and characterized two regions within the enzyme involved in the interaction with LEDGF/p75. The first region centers around residues W131 and W132 while the second extends from I161 up to E170. For the different IN mutants the interaction with LEDGF/p75 and the enzymatic activities were determined. IN(W131A), IN(I161A), IN(R166A), IN(Q168A) and IN(E170A) are impaired for interaction with LEDGF/p75, but retain 3' processing and strand transfer activities. Due to impaired integration, an HIV-1 strain containing the W131A mutation in IN displays reduced replication capacity, whereas virus carrying IN(Q168A) is replication defective. Comparison of the wild-type IN-LEDGF/p75 co-crystal structure with that of the modelled structure of the IN(Q168A) and IN(W131A) mutant integrases corroborated our experimental data.
authors.affiliation: Laboratory for Molecular Virology and Gene Therapy, Molecular Medicine, Katholieke Universiteit Leuven, Flanders, Belgium.
authors.forename: Katrien
authors.initials: K
authors.lastname: Busschots
authors.forename: Arnout
authors.initials: A
authors.lastname: Voet
authors.forename: Marc
authors.initials: M
authors.lastname: De Maeyer
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Rain
authors.forename: Stéphane
authors.initials: S
authors.lastname: Emiliani
authors.forename: Richard
authors.initials: R
authors.lastname: Benarous
authors.forename: Linda
authors.initials: L
authors.lastname: Desender
authors.forename: Zeger
authors.initials: Z
authors.lastname: Debyser
authors.forename: Frauke
authors.initials: F
authors.lastname: Christ
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D018360:Crystallography, X-Ray; D004279:DNA, Viral / Q000096:biosynthesis; D019427:HIV Integrase / Q000737:chemistry* / Q000378:metabolism*; D015497:HIV-1 / Q000201:enzymology* / Q000502:physiology; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000737:chemistry / Q000378:metabolism*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016296:Mutagenesis; D050505:Mutant Proteins / Q000737:chemistry / Q000378:metabolism; D011485:Protein Binding; D025941:Protein Interaction Mapping; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D013329:Structure-Activity Relationship; D014779:Virus Replication / Q000502:physiology
chemical_list: D004279:DNA, Viral; D036341:Intercellular Signaling Peptides and Proteins; D050505:Mutant Proteins; D011994:Recombinant Proteins; C119380:lens epithelium-derived growth factor; D019427:HIV Integrase