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文献和实验made up of the amino-terminal, middle, and PIWI domains. The Piwi Argonaute Zwille (PAZ) domain is held above the base by a "stalk"-like region. The PIWI domain (named for the protein piwi) is similar to ribonuclease H, with a conserved active site aspartate-aspartate
域,它们是:1 个RNA 解旋酶―― DEXH 盒子、1 个含结合dsRNA 折叠的DUF283、1 个结合dsRNA 末端的PAZ、2 个RIII 和1 个dsRNA 结合结构域。PAZ 结构域同时存在于构成RNA 沉默复合物的Argonaute (Ago)蛋白质家族中,事实上,PAZ 就取名于3 个主要的Ago 蛋白质,即Piwi、Ago 和Zwille[12]。贾第虫Dicer 仅有1 个PAZ、2 个RIII 结构域[13],比哺乳动物Dicer 要小得多,但在体外却有正常的裁剪活性。对贾第虫Dicer 晶体
MicroRNAs and Messenger RNA Turnover
(4 ). AGO contains the conserved PAZ and PIWI domains, and seems to be the sole protein required for RISC-mediated activities (5). The discovery that the PIWI domain adopts a ribonuclease (RNase) H fold (6 –8 ) has led to a concept of AGO as an “mRNA
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