Proteostatic control of telomerase function through TRiC-mediated folding of TCAB1.

Proteostatic control of telomerase function through TRiC-mediated folding of TCAB1.
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DOI:
10.1016/j.cell.2014.10.059
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发表时间:
2014-12-04
期刊:
影响因子:
64.5
通讯作者:
Artandi SE
Artandi SE
中科院分区:
生物学1区
文献类型:
--
作者:
Freund A;Zhong FL;Venteicher AS;Meng Z;Veenstra TD;Frydman J;Artandi SE

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Telomere maintenance by telomerase is impaired in the stem cell disease dyskeratosis congenita and during human aging. Telomerase depends upon a complex pathway for enzyme assembly, localization in Cajal bodies and association with telomeres. Here, we identify the chaperonin CCT/TRiC as a critical regulator of telomerase trafficking, using a high content genome-wide siRNA screen in human cells for factors required for Cajal body-localization. We find that TRiC is required for folding the telomerase cofactor TCAB1, which controls trafficking of telomerase and small Cajal body RNAs (scaRNAs). Depletion of TRiC causes loss of TCAB1 protein, mislocalization of telomerase and scaRNAs to nucleoli, and failure of telomere elongation. DC patient-derived mutations in TCAB1 impair folding by TRiC, disrupting telomerase function and leading to severe disease. Our findings establish a critical role for TRiC-mediated protein folding in the telomerase pathway and link proteostasis, telomere maintenance and human disease.
端粒蛋白TPP1的TEL斑块介导端粒酶募集和加工性。
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