An orchestrated program regulating secretory pathway genes and cargos by the transmembrane transcription factor CREB-H.

An orchestrated program regulating secretory pathway genes and cargos by the transmembrane transcription factor CREB-H.
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DOI:
10.1111/tra.12038
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发表时间:
2013-04
期刊:
Traffic (Copenhagen, Denmark)
影响因子:
--
通讯作者:
O'Hare P
O'Hare P
中科院分区:
其他
文献类型:
--
作者:
Barbosa S;Fasanella G;Carreira S;Llarena M;Fox R;Barreca C;Andrew D;O'Hare P

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CREB 3蛋白包含一组由跨膜结构域的存在所定义的ER定位的bZip转录因子。它们受隔室间转运、高尔基体裂解和核转运的调节,在核转运中它们促进适当的转录反应。尽管CREB 3蛋白在分化、炎症和代谢中发挥关键作用,但缺乏将其定义特征与这些不同活动联系起来的一般框架。我们确定了CREB 3组织的独特功能,包括ATB结构域,我们表明这是转录活性所必需的。该结构域在所有其他人bZip因子中不存在,但在果蝇CREBA中保守,其控制分泌途径基因(SPG)。此外,五种人CREB 3因子中的每一种都能够激活果蝇中的SPG,这取决于ATB结构域。CREB 3蛋白,CREB-H,在293细胞中的表达,上调参与分泌能力,细胞外基质形成和脂质代谢的基因,并增加特定货物的分泌。在正常表达CREB-H的肝细胞中,活性形式特异性诱导载脂蛋白(包括ApoA-IV、ApoAI)的分泌,这与CREB-H参与代谢稳态的数据一致。基于这些数据和其他最近的研究,我们提出了CREB 3家族在调节分泌能力方面的一般作用,特别是与专门货物有关。
CREB3 proteins comprise a set of ER-localised bZip transcription factors defined by the presence of a transmembrane domain. They are regulated by inter-compartmental transport, Golgi cleavage and nuclear transport where they promote appropriate transcriptional responses. Although CREB3 proteins play key roles in differentiation, inflammation and metabolism, a general framework relating their defining features to these diverse activities is lacking. We identify unique features of CREB3 organisation including the ATB domain, which we show is essential for transcriptional activity. This domain is absent in all other human bZip factors, but conserved in Drosophila CREBA, which controls secretory pathway genes (SPGs). Furthermore, each of the five human CREB3 factors was capable of activating SPGs in Drosophila, dependent upon the ATB domain. Expression of the CREB3 protein, CREB-H, in 293 cells, upregulated genes involved in secretory capacity, extracellular matrix formation and lipid metabolism and increased secretion of specific cargos. In liver cells, which normally express CREB-H, the active form specifically induced secretion of apolipoproteins, including ApoA-IV, ApoAI, consistent with data implicating CREB-H in metabolic homeostasis. Based on these data and other recent studies, we propose of a general role for the CREB3 family in regulating secretory capacity, with particular relevance to specialised cargos.
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