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  • Title: A unique transcription factor for the A alpha fibrinogen gene is related to the mitochondrial single-stranded DNA binding protein P16.
    Author: Liu Z, Fuentes NL, Jones SA, Hagood JS, Fuller GM.
    Journal: Biochemistry; 1997 Dec 02; 36(48):14799-806. PubMed ID: 9398201.
    Abstract:
    Although stimulation of hepatic cells with interleukin-6 induces the expression of fibrinogen, the molecular basis for this regulation remains largely uncharacterized. A recent examination of the A alpha fibrinogen gene promoter identified a protein, termed the A alpha-core protein, that bound constitutively to the IL-6 response element [Liu, Z. & Fuller, G. M. (1995) J. Biol. Chem. 270, 7580-7586]. This current study provides further characterization of this regulatory protein. The data presented show the following: (i) The A alpha-core protein has a similar molecular weight and identical N-terminal sequence to that of the mitochondrial single-stranded DNA binding protein P16. (ii) The A alpha-core protein and P16 have similar characteristics in terms of DNA binding preference and antigenic properties. (iii) Overexpression of P16 gene in the hepatoma cell lines Hep G2 and Hep 3B enhances the IL-6-induced expression of A alpha fibrinogen. These results demonstrate that the A alpha-core protein is closely related to P16 and involved in the IL-6-regulated transcription of A alpha fibrinogen.
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