Linked Life Data

7744865

Source:http://linkedlifedata.com/resource/pubmed/id/7744865

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pubmed-article:7744865pubmed:abstractTextThe cholesterol analogue 25-hydroxycholesterol kills animal cells by blocking the proteolytic activation of two sterol-regulated transcription factors designated sterol regulatory element binding protein-1 and -2 (SREBP-1 and SREBP-2). These proteins, each approximately 1150 amino acids in length, are embedded in the membranes of the nucleus and endoplasmic reticulum by virtue of hydrophobic COOH-terminal segments. In cholesterol-depleted cells the proteins are cleaved to release soluble NH2-terminal fragments of approximately 480 amino acids that enter the nucleus and activate genes encoding the low density lipoprotein receptor and enzymes of cholesterol synthesis. 25-Hydroxycholesterol blocks this cleavage, and cells die of cholesterol deprivation. We previously described a mutant 25-hydroxycholesterol-resistant hamster cell line (SRD-1 cells) in which the SREBP-2 gene had undergone a recombination between the intron following codon 460 and an intron in an unrelated gene. The SREBP-2 sequence terminated at residue 460, eliminating the membrane attachment domain and producing a constitutively active factor that no longer required proteolysis and thus was not inhibited by 25-hydroxycholesterol. Here, we report that two additional sterol-resistant cell lines (SRD-2 and SRD-3) have also undergone genomic rearrangements in the intron following codon 460 of the SREBP-2 gene. Although the molecular rearrangements differ in the three mutant lines, each leads to the production of a constitutively active transcription factor whose SREBP-2 sequence terminates at residue 460. These findings provide a dramatic illustration of the advantage that introns provide in allowing proteins to gain new functions in response to new environmental challenges.lld:pubmed
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pubmed-article:7744865pubmed:articleTitleThree different rearrangements in a single intron truncate sterol regulatory element binding protein-2 and produce sterol-resistant phenotype in three cell lines. Role of introns in protein evolution.lld:pubmed
pubmed-article:7744865pubmed:affiliationDepartment of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas 75235, USA.lld:pubmed
pubmed-article:7744865pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7744865pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:7744865pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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