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. 1993 Oct;12(10):3879-91.
doi: 10.1002/j.1460-2075.1993.tb06066.x.

Cross-coupling of the NF-kappa B p65 and Fos/Jun transcription factors produces potentiated biological function

B Stein  1 , A S Baldwin Jr, D W Ballard, W C Greene, P Angel, P Herrlich
Affiliations

Cross-coupling of the NF-kappa B p65 and Fos/Jun transcription factors produces potentiated biological function

B Stein et al. EMBO J. 1993 Oct.

Abstract

NF-kappa B and AP-1 represent distinct mammalian transcription factors that target unique DNA enhancer elements. The heterodimeric NF-kappa B complex is typically composed of two DNA binding subunits, NF-kappa B p50 and NF-kappa B p65, which share structural homology with the c-rel proto-oncogene product. Similarly, the AP-1 transcription factor complex is comprised of dimers of the c-fos and c-jun proto-oncogene products or of closely related proteins. We now demonstrate that the bZIP regions of c-Fos and c-Jun are capable of physically interacting with NF-kappa B p65 through the Rel homology domain. This complex of NF-kappa B p65 and Jun or Fos exhibits enhanced DNA binding and biological function via both the kappa B and AP-1 response elements including synergistic activation of the 5' long terminal repeat of the human immunodeficiency virus type 1. These findings support a combinatorial mechanism of gene regulation involving the unexpected cross-coupling of two different classes of transcription factors to form novel protein complexes exhibiting potentiated biological activity.

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