Abstract:
:Retroviral integrases associate during the early viral life cycle with preintegration complexes that catalyze the integration of reverse-transcribed viral cDNA into the host chromosomes. Several cellular and viral proteins have been reported to be incorporated in the preintegration complex. This study demonstrates that transcription factor Yin Yang 1 binds to Moloney murine leukemia virus, human immunodeficiency virus type 1, and avian sarcoma virus integrases. The results of coimmunoprecipitation and in vitro pulldown assays revealed that Yin Yang 1 interacted with the catalytic core and C-terminal domains of Moloney murine leukemia virus and human immunodeficiency virus type 1 integrases, while the transcriptional repression and DNA-binding domains of the Yin Yang 1 molecule interacted with Moloney murine leukemia virus integrase. Immunoprecipitation of the cytoplasmic fraction of virus-infected cells followed by Southern blotting and chromatin immunoprecipitation demonstrated that Yin Yang 1 associated with Moloney murine leukemia virus cDNA in virus-infected cells. Yin Yang 1 enhanced the in vitro integrase activity of Moloney murine leukemia virus, human immunodeficiency virus type 1, and avian sarcoma virus integrases. Furthermore, knockdown of Yin Yang 1 in host cells by small interfering RNA reduced Moloney murine leukemia virus cDNA integration in vivo, although viral cDNA synthesis was increased, suggesting that Yin Yang 1 facilitates integration events in vivo. Taking these results together, Yin Yang 1 appears to be involved in integration events during the early viral life cycle, possibly as an enhancer of integration.
journal_name
J Viroljournal_title
Journal of virologyauthors
Inayoshi Y,Okino Y,Miyake K,Mizutani A,Yamamoto-Kishikawa J,Kinoshita Y,Morimoto Y,Imamura K,Morshed M,Kono K,Itoh T,Nishijima K,Iijima Sdoi
10.1128/JVI.02681-09subject
Has Abstractpub_date
2010-08-01 00:00:00pages
8250-61issue
16eissn
0022-538Xissn
1098-5514pii
JVI.02681-09journal_volume
84pub_type
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