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. 1992 Dec;66(12):7490–7498. doi: 10.1128/jvi.66.12.7490-7498.1992

The kappa B enhancer motifs in human immunodeficiency virus type 1 and simian virus 40 recognize different binding activities in human Jurkat and H9 T cells: evidence for NF-kappa B-independent activation of the kappa B motif.

W Phares 1, B R Franza Jr 1, W Herr 1
PMCID: PMC240457  PMID: 1331533

Abstract

The kappa B transcriptional enhancer motif, present in many viruses, is broadly active in many cell types. It is recognized by c-Rel/HIVEN86A in DNA affinity precipitation (DNAP) assays and by the Rel-related p50 and p65 subunits of the nuclear factor NF-kappa B in electrophoretic mobility shift assays (EMSA). We have analyzed activities that bind the human immunodeficiency virus type 1 and simian virus 40 kappa B motifs in two human leukemia cell lines, Jurkat and H9. In both DNAP and EMSA analyses of Jurkat cell extracts, we detected multiple kappa B motif-binding activities in addition to c-Rel/HIVEN86A and p50-p65 NF-kappa B. In Jurkat cell nuclear extracts, EMSA analysis revealed at least six specific DNA-protein complexes, of which one comigrated with the p50-p65 NF-kappa B complex. Formation of all six complexes was enhanced by stimulation of the cells with phorbol 12-myristate-13-acetate and phytohemagglutinin but was differentially affected by the salt concentration in the binding reaction and by the conditions of Jurkat cell growth. Nuclear extracts from both unstimulated and stimulated H9 cells revealed similar levels of five kappa B motif-specific complexes, all of which displayed mobilities distinct from those of the Jurkat cell complexes. Indeed, a complex corresponding to p50-p65 NF-kappa B was not detectable in nuclear extracts from unstimulated H9 cells although such a complex was apparent in nuclear extracts from stimulated H9 cells. In contrast to the inducibility of a p50-p65 NF-kappa B-like complex, transcriptional enhancers composed of multimerized kappa B motifs displayed similar high levels of activity in both the unstimulated and stimulated H9 cells. Thus, the activity of the kappa B motif in H9 cells corresponded to the abundance of the H9 cell-specific kappa B motif complexes and not to the levels of p50-p65 NF-kappa B complex. These results suggest that the broad activity of the kappa B enhancer element is not only due to the broadly distributed NF-kappa B activator but also to cell type-specific kappa B motif-binding activities.

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