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首页> 外文期刊>Oncogene >Retinoblastoma susceptibility gene product pRB activates hypoxia-inducible factor-1 (HIF-1)
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Retinoblastoma susceptibility gene product pRB activates hypoxia-inducible factor-1 (HIF-1)

机译:视网膜母细胞瘤易感基因产物pRB激活缺氧诱导因子1(HIF-1)

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Hypoxia-inducible factor-1 alpha (HIF-1) constitutes a regulatory subunit of HIF-1, a major transcriptional activator of genes that coordinate physiological and pathological responses towards hypoxia. In order to identify novel interaction partners of HIF-1 we have applied T7 phage display system and identified a domain inherent in the retinoblastoma protein (pRB). The interaction between pRB and HIF-1 was confirmed by in vitro experiments and in transfected cells. Thereby, an HIF-1 domain spanning amino acids 530–694 was mapped to be required for pRB binding. Overexpression of pRB provoked transcriptional activation of HIF-1 under normoxia. Furthermore, the domain of pRB identified to bind HIF-1 in vitro is sufficient to cause HIF-1 transcriptional activation with the further notion that phosphorylation deficient pRB shows stronger HIF-1 transactivation. Using ChIP analysis, we show that HIF-1 responsive elements (HREs) are precipitated using -pRB antibodies. Additionally, a functional interaction between pRB and HIF-1 is confirmed by showing that HIF-1 reverses the transcription repressor function of pRB.
机译:缺氧诱导因子1α(HIF-1)构成HIF-1的调节亚基,HIF-1是协调针对缺氧的生理和病理反应的基因的主要转录激活因子。为了鉴定HIF-1的新型相互作用伴侣,我们应用了T7噬菌体展示系统,并鉴定了成视网膜细胞瘤蛋白(pRB)固有的结构域。通过体外实验和在转染的细胞中证实了pRB和HIF-1之间的相互作用。因此,一个跨越530-694位氨基酸的HIF-1结构域被映射为pRB结合所必需的。 pRB的过表达引起常氧下HIF-1的转录激活。此外,在体外鉴定出结合HIF-1的pRB结构域足以引起HIF-1转录激活,进一步的概念是磷酸化缺陷的pRB显示出更强的HIF-1反式激活。使用ChIP分析,我们显示使用-pRB抗体沉淀了HIF-1响应元件(HRE)。此外,通过显示HIF-1逆转了pRB的转录阻遏物功能,证实了pRB和HIF-1之间的功能相互作用。

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