Interaction between Nef and INI1/SMARCB1 augments replicability of HIV-1 in resting human peripheral blood mononuclear cells

Interaction between Nef and INI1/SMARCB1 augments replicability of HIV-1 in resting human... A central feature of HIV-1 infection is the inability of entering virus to integrate into chromosomes of resting T lymphocytes unless they are mitogenically activated. In contrast, SIVpbj1.9 replicates in initially resting T lymphocytes by activating infected cells. Previous reports have shown that a difference in Nef-mediated T cell activation between HIV-1 and SIVpbj1.9 plays a critical role in the differing abilities of these viruses to replicate in resting lymphocytes. However, the molecular details of these differences are still unclear. Here, we show that infection with a chimeric virus, HSIVnef, which harbors the 5′ 308 nucleotides of SIVpbj1.9 nef in place of the 5′ 221 nucleotides of HIV-1 nef in the HIV-1 proviral backbone, resulted in integration of the provirus into host chromosomes without mitogenic activation and thereby replication in resting human PBMCs (hPBMCs). These results indicate that Nef is an essential viral determinant for the integration of provirus into host chromosomes in resting T cells. Using the yeast two-hybrid system, we identified integrase interactor-1 (INI1/SMARCB1) as a cellular factor that is involved in the integration process via interaction with Nef. Although INI1 interacted with both SIVpbj1.9 and HIV-1 Nefs, SIVpbj1.9 Nef, but not HIV-1 Nef, enhanced proviral integration into host DNA. Furthermore, mutational analysis revealed that the basic-amino-acid-rich amino-terminal domain in SIVpbj1.9 Nef is crucial for interaction with INI1 and virus replication in resting hPBMCs. Taken together, these data indicate that Nef is a critical viral protein for incorporating nascent proviral DNA into host chromosomes in resting PBMCs and that this occurs through interaction with INI1. This elucidates the basis for replication of the integrated provirus when the host cell is in a resting state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Virology Springer Journals

Interaction between Nef and INI1/SMARCB1 augments replicability of HIV-1 in resting human peripheral blood mononuclear cells

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Publisher
Springer Vienna
Copyright
Copyright © 2015 by Springer-Verlag Wien
Subject
Biomedicine; Virology; Medical Microbiology; Infectious Diseases
ISSN
0304-8608
eISSN
1432-8798
D.O.I.
10.1007/s00705-014-2315-9
Publisher site
See Article on Publisher Site

Abstract

A central feature of HIV-1 infection is the inability of entering virus to integrate into chromosomes of resting T lymphocytes unless they are mitogenically activated. In contrast, SIVpbj1.9 replicates in initially resting T lymphocytes by activating infected cells. Previous reports have shown that a difference in Nef-mediated T cell activation between HIV-1 and SIVpbj1.9 plays a critical role in the differing abilities of these viruses to replicate in resting lymphocytes. However, the molecular details of these differences are still unclear. Here, we show that infection with a chimeric virus, HSIVnef, which harbors the 5′ 308 nucleotides of SIVpbj1.9 nef in place of the 5′ 221 nucleotides of HIV-1 nef in the HIV-1 proviral backbone, resulted in integration of the provirus into host chromosomes without mitogenic activation and thereby replication in resting human PBMCs (hPBMCs). These results indicate that Nef is an essential viral determinant for the integration of provirus into host chromosomes in resting T cells. Using the yeast two-hybrid system, we identified integrase interactor-1 (INI1/SMARCB1) as a cellular factor that is involved in the integration process via interaction with Nef. Although INI1 interacted with both SIVpbj1.9 and HIV-1 Nefs, SIVpbj1.9 Nef, but not HIV-1 Nef, enhanced proviral integration into host DNA. Furthermore, mutational analysis revealed that the basic-amino-acid-rich amino-terminal domain in SIVpbj1.9 Nef is crucial for interaction with INI1 and virus replication in resting hPBMCs. Taken together, these data indicate that Nef is a critical viral protein for incorporating nascent proviral DNA into host chromosomes in resting PBMCs and that this occurs through interaction with INI1. This elucidates the basis for replication of the integrated provirus when the host cell is in a resting state.

Journal

Archives of VirologySpringer Journals

Published: Mar 1, 2015

References

  • Cellular APOBEC3G restricts HIV-1 infection in resting CD4 + T cells
    Chiu, YL; Soros, VB; Kreisberg, JF; Stopak, K; Yonemoto, W
  • Concerted action of cellular JNK and Pin1 restricts HIV-1 genome integration to activated CD4 + T lymphocytes
    Manganaro, L; Lusic, M; Gutierrez, MI; Cereseto, A; Sal, G
  • Pathology and diagnosis of SMARCB1-deficient tumors
    Margol, AS; Judkins, AR
  • Two orphan seven-transmembrane segment receptors which are expressed in CD4-positive cells support simian immunodeficiency virus infection
    Farzan, M; Choe, H; Martin, K; Marcon, L; Hofmann, W
  • A masked NES in INI1/hSNF5 mediates hCRM1-dependent nuclear export: implications for tumorigenesis
    Craig, E; Zhang, ZK; Davies, KP; Kalpana, GV

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