Crystal structure of folliculin reveals a hidDENN function in genetically inherited renal cancer.

Crystal structure of folliculin reveals a hidDENN function in genetically inherited renal cancer.
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DOI:
10.1098/rsob.120071
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发表时间:
2012-08
期刊:
影响因子:
5.8
通讯作者:
Blundell TL
Blundell TL
中科院分区:
生物学2区
文献类型:
--
作者:
Nookala RK;Langemeyer L;Pacitto A;Ochoa-Montaño B;Donaldson JC;Blaszczyk BK;Chirgadze DY;Barr FA;Bazan JF;Blundell TL

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肾肿瘤抑制蛋白毛囊的突变会导致增生性皮肤损伤、肺部并发症和肾癌。据报道,毛囊蛋白与AMP激活的激酶相互作用,AMP激活的激酶是雷帕霉素途径的哺乳动物靶点的关键成分。大多数致癌突变导致毛囊蛋白的羧基末端截断,表明该结构域在肿瘤抑制中的功能重要性。我们在这里介绍了毛囊蛋白羧基末端结构域的晶体结构,并证明它与正常细胞和肿瘤(Denn)结构域蛋白的差异表达密切相关,Denn结构域蛋白是Rab鸟嘌呤核苷酸交换因子(GEF)家族。通过生化分析,我们证明毛囊蛋白具有全球环境基金的活性,这表明毛囊蛋白可能是这类RAB GEF的远亲成员。
Mutations in the renal tumour suppressor protein, folliculin, lead to proliferative skin lesions, lung complications and renal cell carcinoma. Folliculin has been reported to interact with AMP-activated kinase, a key component of the mammalian target of rapamycin pathway. Most cancer-causing mutations lead to a carboxy-terminal truncation of folliculin, pointing to a functional importance of this domain in tumour suppression. We present here the crystal structure of folliculin carboxy-terminal domain and demonstrate that it is distantly related to differentially expressed in normal cells and neoplasia (DENN) domain proteins, a family of Rab guanine nucleotide exchange factors (GEFs). Using biochemical analysis, we show that folliculin has GEF activity, indicating that folliculin is probably a distantly related member of this class of Rab GEFs.
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