Linked Life Data

1332964

Source:http://linkedlifedata.com/resource/pubmed/id/1332964

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pubmed-article:1332964pubmed:abstractTextThe 5'-flanking DNA of the mouse RII beta subunit of the cAMP-dependent protein kinase gene was characterized by transient transfection of RII beta-CAT constructs into mouse neuroblastoma cells (NB2a) and Chinese hamster ovary (CHO) cells and by gel mobility shift and footprinting assays. The minimal promoter of the RII beta gene was composed of two adjacent functional elements. A 3'-element which supported enhanced CAT activity was located between base pairs (bp) -267/-168 from the translation initiation start site. CAT plasmids containing these RII beta sequences showed 12- and 16-fold increased CAT activity in the NB2a and CHO cells, respectively, compared to the basic CAT vector. Plasmids containing 20 additional bp 5' to the -267/-168 fragment showed 2-fold more CAT activity than the shorter fragment in NB2a cells, while CAT activity in CHO cells was nearly the same for both constructs. CAT plasmids containing only this 20-bp fragment showed 9- and 13-fold increased CAT activity in NB2a and CHO cells, respectively. The core promoter of the RII beta gene lacked classical TATA and CAT sequences, but contained 3 copies of the Sp1 core consensus sequence. Gel mobility shift assays using 32P-labeled 5'-flanking DNA containing bp -291/-49 and nuclear extracts from NB2a and CHO cells displayed several retarded bands in the gels suggesting complex formation with nuclear DNA-binding factors. Unlabeled DNA containing bp -291/-49 blocked the appearance of all retarded bands. Competition using an oligonucleotide corresponding to the Sp1 DNA-binding site effectively blocked the appearance of the two more slowly migrating bands but did not affect the major rapidly migrating bands. DNase I footprinting analysis using purified Sp1 protein confirmed that Sp1 could bind to the Sp1 sites. Methylation interference and mutational analysis showed that one of the faster migrating bands was the result of factor binding to the DNA sequence adjacent to the Sp1 sites. Additional tissue-specific nuclear-binding factor sequences were detected upstream of the core promoter. Our data suggest that the core promoter of the RII beta gene can initiate transcription from the DNA around the Sp1 sites but that there are tissue-specific nuclear factor-binding sites located distal to the Sp1 sites.lld:pubmed
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pubmed-article:1332964pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:1332964pubmed:articleTitleCharacterization of a minimal promoter element required for transcription of the mouse type II beta regulatory subunit (RII beta) of cAMP-dependent protein kinase.lld:pubmed
pubmed-article:1332964pubmed:affiliationDepartment of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461.lld:pubmed
pubmed-article:1332964pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1332964pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:1332964pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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