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  • Open Access

Identification of SFPQ as novel interacting partner of HIV-1 Integrase and its functional characterization

  • 1,
  • 2,
  • 2,
  • 1,
  • 2,
  • 2 and
  • 1Email author
BMC Infectious Diseases201212 (Suppl 1) :P80

  • Published:


  • Viral Genome
  • Gene Cloning
  • Interact Partner
  • Nuclear Import
  • Stable Cell Line


HIV-1 requires the support of its appropriate host for the survival and propagation like any other parasite. These host cell factors have been reported to be involved in different stages of viral life cycle. The nuclear import and infection maintenance of HIV-1 Integrase (IN) in human cells is dependent upon the integration efficiency of the proviral DNA and stability of viral RNA. In our study we identified a new host cell interacting factor for HIV-1 IN, SFPQ-a RNA splicing protein, by cross-linking, pull down and mass spectrometry.


This study involved gene cloning, protein expression, purification, cell culture, transfection and selection of stable cell lines for the HIV-1 IN GFP fusion protein and in-vitro IN activity assays study.


We identified a new host cell interacting factor for HIV-1 IN-SFPQ, an RNA splicing protein that interacts with HIV-1, shows 5 fold binding (Kd 0.05 µM) and modulates its disintegration activity.


This study presents SFPQ as a novel cellular factor which has functional interaction with HIV-1 IN. SFPQ, revealed that this protein is not only recruited to the sites where viral genome integration takes place but also increases the disintegration activity and 3’ end processing activities of HIV-1 IN.

Authors’ Affiliations

Department of Chemistry, University of Delhi, India
Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi, India


© Sur et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.