Biochemical and genetic analyses of integrase-interacting proteins lens epithelium-derived growth factor (LEDGF)/p75 and hepatoma-derived growth factor related protein 2 (HRP2) in preintegration complex function and HIV-1 replication.
Human immunodeficiency virus type 1 (HIV-1) integrase (IN) functions in cells within the context of high molecular weight preintegration complexes (PICs). Lens epithelium-derived growth factor (LEDGF) transcriptional coactivator/p75 and hepatoma-derived growth factor related protein 2 (HRP2) tightly bind to HIV-1 IN and stimulate its integration activity in vitro. Here, we show that each recombinant host cell factor efficiently reconstitutes the in vitro activity of HIV-1 PICs disrupted for functional integration by pre-treatment with high concentrations of salt. Mutational analysis reveals that both the IN-binding and DNA-binding activities of LEDGF/p75 contribute to functional PIC reconstitution. We also investigate a role(s) for these proteins in HIV-1 infection by using short-interfering RNA. HIV-1 infection was essentially unaffected in HeLa-P4 cells depleted for LEDGF/p75, HRP2, or both proteins. We conclude that cells knocked-out for LEDGF/p75 and/or HRP2 will be useful genetic tools to address the roles of these host cell factors in HIV-1 replication.
Vandegraaff
Nick
N
Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115, USA.
Devroe
Eric
E
Turlure
Fanny
F
Silver
Pamela A
PA
Engelman
Alan
A
D002460:Cell Line; D004247:DNA / Q000378:metabolism; D004252:DNA Mutational Analysis; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology; D020868:Gene Silencing; D019427:HIV Integrase / Q000378:metabolism; D015497:HIV-1 / Q000502:physiology*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics* / Q000502:physiology*; D011485:Protein Binding; D016662:Virus Integration; D014779:Virus Replication
D004268:DNA-Binding Proteins; D036341:Intercellular Signaling Peptides and Proteins; C051610:hepatoma-derived growth factor; C119380:lens epithelium-derived growth factor; D004247:DNA; D019427:HIV Integrase