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Endoribonuclease XendoU
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Endoribonuclease XendoU : ウィキペディア英語版
Endoribonuclease XendoU

In molecular biology, Endoribonuclease XendoU refers to a protein domain. This particular entry represents endoribonucleases involved in RNA biosynthesis which has been named XendoU in ''Xenopus laevis'' (African clawed frog). This protein domain belongs to a family of evolutionarily related proteins. XendoU is a U-specific metal dependent enzyme that produces products with a 2'-3' cyclic phosphate termini.
==Function==
The endonuclease, XendoU, is highly involved in the biosynthesis of a specific subclass of ''Xenopus laevis'' encoded small nucleolar RNAs (snoRNA) which are a large family of non-coding RNAs with essential roles in ribosome biogenesis. Most snoRNAs are encoded in introns and are released through the splicing reaction. Others, instead, produced by an alternative pathway consisting of endonucleolytic processing of pre-mRNA. XendoU, is the endoribonuclease responsible for this activity. 〔 〕
Studies have shown that XendoU-RNA complex is Manganese(Mn2+)-independent.This infers that RNA binding and processing activities can be functionally separated since ions are essential for cleavage.〔 〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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