Liver enriched transcription factor

Details Liver enriched transcription factor Liver enriched transcription factor

2008-05-06

2008-05-06

Rao, Manjunath (Department: 1652)

Chemistry: analytical and immunological testing

Biospecific ligand binding assay

C436S086000, C530S350000, C530S358000, C530S361000, C530S387200, C530S388210, C536S023200

Reexamination Certificate

active

07368293

ABSTRACT:
HNF-4 (hepatocyte nuclear factor 4) is a protein enriched in liver extracts that binds to sites required for the transcription of the transthyretin (TTR) and apolipoprotein CIII (apoCIII) genes (Costa et al., 1989; Costa et al., 1990; Leff et al., 1989). We have purified HNF-4 protein (54 kD) and isolated a cDNA clone encoding the protein. HNF-4 is a member of the steroid hormone receptor superfamily with an unusual amino acid in the conserved “knuckle” of the first zinc finger (DGCKG). This and the fact that HNF-4 does not bind significantly to estrogen, thyroid hormone or glucocorticoid response elements indicate that HNF-4 may represent a new subfamily. HNF-4 binds to its recognition site as a dimer and activates transcription in a sequence-specific fashion in nonhepatic (HeLa) cells. HNF-4 mRNA is present in kidney and intestine as well as liver but is absent in other tissues. DNA binding data suggest that HNF-4 could be identical to liver factor A1 (LF-A1), a factor previously shown to regulate the transcription of the α-1 antitrypsin, apolipoprotein A1 and pyruvate kinase genes.

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