HIV-1 Tat interaction with cyclin T1 represses mannose receptor and the bone morphogenetic protein receptor-2 transcription

Archives of Biochemistry and Biophysics
Robert L CaldwellVirginia L Shepherd

Abstract

Macrophage transcription is significantly altered by HIV-1 infection. HIV Tat, an immediate-early product of the viral lifecycle, interacts with host transcription factors to alter host gene expression. We have previously shown that Tat represses transcription from the mannose receptor (MR) and the bone morphogenetic protein receptor-2 (BMPR2) promoters. The current study shows that transcriptional repression of these receptors involves Tat interaction with cyclin T1. Assays using U937 human monocytic cells transiently expressing MR or BMPR2 promoter-luciferase constructs demonstrated equal repression by one- and two-exon Tat gene products. A mutant Tat expression vector encoding Tat protein lacking the cyclin T1 binding domain failed to inhibit MR and BMPR2 promoter activities. Over-expression of cyclin T1 in the presence of wild-type Tat resulted in recovered activity from both promoters. Finally, two inhibitors of cyclin-dependent kinase 9 (a dominant negative CDK9 and flavopiridol) repressed activity from the MR and BMPR2 promoters.

Citations

Dec 21, 2004·Springer Seminars in Immunopathology·Marie Larsson
May 18, 2012·Journal of Virology·Marta J Gonzalez-HernandezDavid M Markovitz
Jul 22, 2009·Molecular and Cellular Biology·Stephanie J Ellison-ZelskiElaine T Alarid
Aug 20, 2005·American Journal of Respiratory Cell and Molecular Biology·Souvenir D TachadoHenry Koziel
Feb 11, 2015·Global Heart·Suman Gidwani, Ajith Nair
Sep 17, 2011·Revue de pneumologie clinique·C TcherakianL-J Couderc
Nov 11, 2011·PloS One·Céline MarbanSiavash K Kurdistani
Sep 2, 2005·Veterinary Immunology and Immunopathology·A Gruden-Movsesijan, Lj Sofronic Milosavljevic

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