Transactivator of transcription from HIV type 1 subtype E selectively inhibits TNF gene expression via interference with chromatin remodeling of the TNF locus.
The transactivator of transcription (Tat) protein is essential for efficient HIV type 1 (HIV-1) replication and is involved in the transcriptional regulation of the host immune response gene, TNF. In this study, we demonstrate that Tat proteins from representative HIV-1 subtype E isolates, but not from subtypes B or C, selectively inhibit TNF gene transcription and protein production in CD4(+) Jurkat T cells. Strikingly, we show that this repression is due to a tryptophan at residue 32 of Tat E and is secondary to interference with recruitment of the histone acetyltransferase P/CAF to the TNF promoter and with chromatin remodeling of the TNF locus. This study presents a novel mechanism by which HIV-1 manipulates a host immune response gene that is important in its own replication. Moreover, these results demonstrate a new mechanism by which the TNF gene is regulated via chromatin remodeling secondary to viral infection.
Ranjbar
Shahin
S
CBR Institute for Biomedical Research, Harvard Medical School, Boston, MA 02115, USA.
Rajsbaum
Ricardo
R
Goldfeld
Anne E
AE
D000107:Acetylation; D000595:Amino Acid Sequence; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D042002:Chromatin Assembly and Disassembly / Q000235:genetics*; D005786:Gene Expression Regulation / Q000235:genetics*; D015696:Gene Products, tat / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014644:Genetic Variation / Q000235:genetics; D015497:HIV-1 / Q000737:chemistry / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D051548:Histone Acetyltransferases / Q000235:genetics / Q000378:metabolism; D006657:Histones / Q000378:metabolism; D006801:Humans; D019169:Jurkat Cells; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics; D017434:Protein Structure, Tertiary; D015534:Trans-Activators / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic / Q000235:genetics; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D050880:p300-CBP Transcription Factors / Q000235:genetics / Q000378:metabolism; D054322:tat Gene Products, Human Immunodeficiency Virus; D000099224:p300-CBP-Associated Factor
D018797:Cell Cycle Proteins; D015696:Gene Products, tat; D051548:Histone Acetyltransferases; D006657:Histones; D015534:Trans-Activators; D014157:Transcription Factors; D014409:Tumor Necrosis Factor-alpha; D050880:p300-CBP Transcription Factors; D054322:tat Gene Products, Human Immunodeficiency Virus; D000099224:p300-CBP-Associated Factor