scholarly journals Variable role of the long terminal repeat Sp1-binding sites in human immunodeficiency virus replication in T lymphocytes.

1991 ◽  
Vol 65 (3) ◽  
pp. 1414-1419 ◽  
Author(s):  
C Parrott ◽  
T Seidner ◽  
E Duh ◽  
J Leonard ◽  
T S Theodore ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
T Lymphocytes ◽  
Long Terminal Repeat ◽  
Virus Replication ◽  
Binding Sites ◽  
Terminal Repeat ◽  
Human Immunodeficiency Virus Replication ◽  
Immunodeficiency Virus

scholarly journals A proliferative p53-responsive element mediates tumor necrosis factor alpha induction of the human immunodeficiency virus type 1 long terminal repeat.

1995 ◽  
Vol 15 (6) ◽  
pp. 3450-3459 ◽  
Author(s):  
A Gualberto ◽  
M L Hixon ◽  
T S Finco ◽  
N D Perkins ◽  
G J Nabel ◽  
...  
Keyword(s):  
Human Immunodeficiency Virus ◽  
Tumor Necrosis Factor ◽  
Long Terminal Repeat ◽  
Binding Sites ◽  
Tumor Necrosis ◽  
Terminal Repeat ◽  
Mutant P53 ◽  
Immunodeficiency Virus ◽  
Necrosis Factor

Transforming mutants of the p53 tumor suppressor gene can positively regulate transcription from several promoters that do not contain known p53 binding sites. Here, we report the identification of a novel p53 binding site in the human immunodeficiency virus long terminal repeat that specifically mediates mutant p53 transactivation. This DNA element was bound by endogenous Jurkat p53 when these cells were stimulated by tumor necrosis factor. Mutation of this sequence inhibited p53 transactivation and tumor necrosis factor inducibility of the human immunodeficiency virus type 1 long terminal repeat. In addition, this DNA element was found to be sufficient to confer mutant p53 responsiveness on a heterologous minimal promoter. It has been hypothesized that transforming mutants of p53 represent a proliferative conformational stage that can be adopted by the native protein under stimulation by growth factors. The data presented suggest that proliferative and antiproliferative p53 conformations recognize different DNA binding sites in order to mediate distinct biological functions. Thus, transforming mutants of p53 that fold into the proliferative conformation would favor proliferative over antiproliferative functions.

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