INHIBITION OF TRANSCRIPTION FACTORS BELONGING TO THE REL/NF-KAPPA-B FAMILY BY A TRANSDOMINANT NEGATIVE MUTANT

被引:134
作者
LOGEAT, F [1 ]
ISRAEL, N [1 ]
TEN, R [1 ]
BLANK, V [1 ]
LEBAIL, O [1 ]
KOURILSKY, P [1 ]
ISRAEL, A [1 ]
机构
[1] INST PASTEUR,IMMUNOL VIRALE LAB,F-75724 PARIS 15,FRANCE
关键词
HETERODIMER; KBF1; REL; NF-KAPPA-B; TRANSDOMINANT NEGATIVE MUTANT;
D O I
10.1002/j.1460-2075.1991.tb07708.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The KBF1 factor, which binds to the enhancer A located in the promoter of the mouse MHC class I gene H-2K(b), is indistinguishable from the p50 DNA binding subunit of the transcription factor NF-kappa-B, which regulates a series of genes involved in immune and inflammatory responses. The KBF1/p50 factor binds as a homodimer but can also form heterodimers with the products of other members of the same family, like the c-rel and v-rel (proto)oncogenes. The dimerization domain of KBF1/p50 is contained between amino acids 201 and 367. A mutant of KBF1/p50 (DELTA-SP), unable to bind to DNA but able to form homo- or heterodimers, has been constructed. This protein reduces or abolishes in vitro the DNA binding activity of wild-type proteins of the same family (KBF1/p50, c- and v-rel). This mutant also functions in vivo as a trans-acting dominant negative regulator: the transcriptional inducibility of the HIV long terminal repeat (which contains two potential NF-kappa-B binding sites) by phorbol ester (PMA) is inhibited when it is co-transfected into CD4+ T cells with the DELTA-SP mutant. Similarly the basal as well as TNF or IL1-induced activity of the MHC class I H-2K(b) promoter can be inhibited by this mutant in two different cell lines. These results constitute the first formal demonstration that these genes are regulated by members of the rel/NF-kappa-B family.
引用
收藏
页码:1827 / 1832
页数:6
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