The histone gene cell cycle regulator HiNF-P is a unique zinc finger transcription factor with a novel conserved auxiliary DNA-binding motif
Department of Cell Biology
Amino Acid Motifs; Amino Acid Sequence; Base Sequence; Binding Sites; Cell Cycle; Cell Cycle Proteins; Cell Line; Conserved Sequence; DNA; Hela Cells; Histones; Humans; Models, Molecular; Molecular Sequence Data; Multiprotein Complexes; Mutagenesis; Nuclear Proteins; RNA, Small Interfering; Recombinant Proteins; Repressor Proteins; Sequence Homology, Amino Acid; Zinc Fingers
Accumulation of histone proteins is necessary for packaging of replicated DNA during the S phase of the cell cycle. Different mechanisms operate to regulate histone protein levels, and induction of human histone gene expression at the G1-S phase transition plays a critical role. The zinc finger HiNF-P and coactivator p220 (NPAT) proteins are key regulators of histone gene expression. Here, we describe a novel HiNF-P-specific conserved region (PSCR) located within the C-terminus that is present in HiNF-P homologues of all metazoan species that have been examined. The PSCR motif is required for activation of histone H4 gene transcription and contributes to DNA binding of HiNF-P. Thus, the PSCR module represents an auxiliary DNA-binding determinant that plays a critical role in mediating histone gene expression during the cell cycle and defines HiNF-P as a unique cell cycle regulatory member of the zinc finger transcription factor family.
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Citation: Biochemistry. 2008 Nov 4;47(44):11415-23. Epub 2008 Oct 14. Link to article on publisher's site