E4BP4/NFIL3, a PAR-related bZIP factor with many roles.
E4BP4, a mammalian basic leucine zipper (bZIP) transcription factor, was first identified through its ability to bind and repress viral promoter sequences. Subsequently, E4BP4 and homologues in other species have been implicated in a diverse range of processes including commitment to cell survival versus apoptosis, the anti-inflammatory response and, most recently, in the mammalian circadian oscillatory mechanism. In some of these cases at least, E4BP4 appears to act antagonistically with members of the related PAR family of transcription factors with which it shares DNA-binding specificity. This diversity of function is mirrored by the regulatory pathways impinging on E4BP4, which include regulation by ras via the lymphokine IL-3 in murine B-cells, by thyroid hormone during Xenopus tail resorption, by glucocorticoids in murine fibroblasts and by calcium in rat smooth muscle cells. This article will cover the unfolding role/s of and regulation of E4BP4, E4BP4-like proteins and PAR factors in species as diverse as mouse and C. elegans.
Cowell
Ian G
IG
Department of Gene Expression and Development, The Roslin Institute (Edinburgh), Roslin, Midlothian. Scotland EH25 9PS. ian.cowell@bbsrc.ac.uk
D000595:Amino Acid Sequence; D000818:Animals; D050976:Basic-Leucine Zipper Transcription Factors; D001665:Binding Sites; D001683:Biological Clocks / Q000235:genetics; D002940:Circadian Rhythm / Q000235:genetics; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D051790:G-Box Binding Factors; D006801:Humans; D016350:Leucine Zippers; D008969:Molecular Sequence Data; D012097:Repressor Proteins / Q000378:metabolism*; D016415:Sequence Alignment; D015398:Signal Transduction / Q000502:physiology; D014157:Transcription Factors / Q000737:chemistry / Q000378:metabolism*; D014158:Transcription, Genetic
D050976:Basic-Leucine Zipper Transcription Factors; D004268:DNA-Binding Proteins; D051790:G-Box Binding Factors; C497440:NFIL3 protein, human; D012097:Repressor Proteins; D014157:Transcription Factors