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Pubmed ID :8923460
Publication Date : //

Cloning, characterization, and steroid-dependent posttranscriptional processing of RUSH-1 alpha and beta, two uteroglobin promoter-binding proteins.


We previously used gel shift assays, Southwestern blots, and UV cross-linking to identify four proteins that bind to the 203-bp 5'-flanking region (-194/ +9) of the rabbit uteroglobin gene. Here we report cloning, by recognition site screening, the cDNAs for two of the uteroglobin promoter-binding proteins (95 kDa and 113 kDa). Their presumptive nucleotide-binding motifs share 61% identity with the SWI2/SNF2 helicase superfamily, and each protein has the novel C3HC4 (RING) zinc-finger signature near its C terminus. RUSH-1 alpha, the 113-kDa protein, is the rabbit homolog of human HIP116, a protein that binds to the human immunodeficiency virus-1 promoter. RUSH-1 beta is a 95-kDa truncated version of RUSH-1 alpha that results from alternative splicing of a 57-bp exon as confirmed by genomic cloning. Northern analysis showed mRNA expression (5.2 kb) was induced by progesterone +/- PRL and antagonized by estrogen. However, because the two proteins result from alternative splicing of a 57-bp exon, the small difference in their mRNA sizes could not be detected by Northern analysis. Therefore, competitive RT-PCR and HPLC were used to quantify differences in the ratios of their mRNAs. Progesterone +/- PRL treatment increased (P < 0.005) the ratio of message for RUSH-1 alpha compared with RUSH-1 beta. Western analysis showed the RUSH-1 alpha protein is increased in response to progesterone +/- PRL and decreased in response to estrogen. The antiserum used for immunoblotting specifically supershifts uteroglobin promoter-protein complexes in gel shift experiments. Because RUSH-1 alpha and beta messages were detected in lung, liver, and HRE-H9 cells, these proteins may regulate genes in numerous cell types.

Authors : Hayward-Lester A , Hewetson A , Beale E G , Oefner P J , Doris P A , Chilton B S ,

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