The mammalian endoplasmic reticulum stress response element consists of an evolutionarily conserved tripartite structure and interacts with a novel stress-inducible complex - PubMed (original) (raw)
The mammalian endoplasmic reticulum stress response element consists of an evolutionarily conserved tripartite structure and interacts with a novel stress-inducible complex
B Roy et al. Nucleic Acids Res. 1999.
Abstract
When mammalian cells are subjected to calcium depletion stress or protein glycosylation block, the transcription of a family of glucose-regulated protein (GRP) genes encoding endoplasmic reticulum (ER) chaperones is induced to high levels. The consensus mammalian ER stress response element (ERSE) conserved among grp promoters consists of a tripartite structure CCAAT(N9)CCACG, with N being a strikingly GC-rich region of 9 bp. The ERSE, in duplicate copies, can confer full stress inducibility to a heterologous promoter in a sequence-specific but orientation-independent manner. In addition to CBF/NF-Y and YY1 binding to the CCAAT and CCACG motifs, respectively, we further discovered that an ER stress-inducible complex (ERSF) from HeLa nuclear extract binds specifically to the ERSE. Strikingly, the interaction of the ERSF with the ERSE requires a conserved GGC motif within the 9 bp region. Since mutation of the GGC triplet sequence also results in loss of stress inducibility, specific sequence within the 9 bp region is an integral part of the tripartite structure. Finally, correlation of factor binding with stress inducibility reveals that ERSF binding to the ERSE alone is not sufficient; full stress inducibility requires integrity of the CCAAT, GGC and CCACG sequence motifs, as well as precise spacing among these sites.
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