Phorbol esters modulate the phosphorylation of human T-cell leukemia virus type I Tax.

Abstract:

:The Tax protein from human T-cell leukemia virus type I (HTLV-I) is a 40-kDa phosphoprotein capable of activating transcription from its own long terminal repeat (LTR), as well as increasing the transcription of cellular genes. Transcriptional activation of the HTLV-I LTR has been demonstrated via a cyclic-AMP-responsive element within the 21-bp Tax-responsive elements of the LTR. Phorbol esters also upregulate expression via the LTR. Since phosphorylation of Tax may play a role in these processes, we investigated the relative effects of kinase-stimulating agents on 32P incorporation into Tax. Our studies demonstrated that the phorbol ester 4 beta-phorbol-12 beta-myristate-13 alpha-acetate greatly stimulated Tax phosphorylation in a time- and dose-dependent manner. In contrast, 8-bromoadenosine 3'-5'-cyclic monophosphate induced little stimulation of Tax phosphorylation. Tax phosphorylation occurred only on serine residues and was mapped to a single tryptic fragment in both Tax-producing human lymphocytes and mouse fibroblast cells.

journal_name

J Virol

journal_title

Journal of virology

authors

Fontes JD,Strawhecker JM,Bills ND,Lewis RE,Hinrichs SH

doi

10.1128/JVI.67.7.4436-4441.1993

subject

Has Abstract

pub_date

1993-07-01 00:00:00

pages

4436-41

issue

7

eissn

0022-538X

issn

1098-5514

journal_volume

67

pub_type

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