Hsp90 facilitates accurate loading of precursor piRNAs into PIWI proteins.

Hsp90 facilitates accurate loading of precursor piRNAs into PIWI proteins.
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DOI:
10.1261/rna.037200.112
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发表时间:
2013-07
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Tomari Y
Tomari Y
中科院分区:
其他
文献类型:
--
作者:
Izumi N;Kawaoka S;Yasuhara S;Suzuki Y;Sugano S;Katsuma S;Tomari Y

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这篇论文提供了Hsp 90分子伴侣机制参与PIWI蛋白装载piRNA的证据。伴侣蛋白似乎影响正确的5′-核苷酸偏好。PIWI相互作用RNA(piRNA)保护基因组免受动物性腺中的转座子活性的影响。Hsp 90分子伴侣机制与皮尔纳途径有关,但其确切作用仍不清楚。在这里,我们检查了17-N-烯丙基氨基-17-去甲氧基格尔德霉素(17-AAG)(一种Hsp 90特异性抑制剂)对皮尔纳途径的影响。在家蚕卵巢来源的BmN 4细胞中,17-AAG处理降低了piRNA和PIWI蛋白的水平。在体外,前体皮尔纳加载时的5′-核苷酸偏好性受到17-AAG的损害,而3′-末端修剪和2′-O-甲基化不受影响。我们的数据突出了Hsp 90在将前体piRNA准确加载到PIWI蛋白中的作用。
This paper provides evidence that the Hsp90 chaperone machinery participates in loading of piRNAs by PIWI proteins. The chaperone appears to influence correct 5′-nucleotide preference. PIWI-interacting RNAs (piRNAs) defend the genome against transposon activity in animal gonads. The Hsp90 chaperone machinery has been implicated in the piRNA pathway, but its exact role remains obscure. Here, we examined the effect of 17-N-allylamino-17-demethoxygeldanamycin (17-AAG), an Hsp90-specific inhibitor, on the piRNA pathway. In the silkworm ovary-derived BmN4 cells, 17-AAG treatment reduced the level of piRNAs and PIWI proteins. In vitro, the 5′-nucleotide preference upon precursor piRNA loading was compromised by 17-AAG, whereas 3′-end trimming and 2′-O-methylation were unaffected. Our data highlight a role of Hsp90 in accurate loading of precursor piRNAs into PIWI proteins.
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