D臂
D臂（英语：D arm）是转运RNA（tRNA）的一个三级结构，包括有两个D茎和一个D环，得名于D环上所含有的特殊碱基二氢尿嘧啶（Dihydrouracil）。 D环的主要功能是用于识别，现在普遍认为D环是氨酰tRNA合成酶（一个将tRNA氨酰化使之携带氨基酸的酶）的识别位点。D茎也可能有识别作用，但这还有待证明。
这是一个高度可变的区域，它不寻常的鸟苷残基过密结构很值得注意，它似乎对tRNA的三级结构的稳定起到重要作用。
D arm
中文百科
英语百科
D arm D臂
The D arm is a feature in the tertiary structure of transfer RNA (tRNA). It is composed of the two D stems and the D loop. The D loop contains the base dihydrouracil, for which the arm is named. The D loop's main function is that of recognition. It is widely believed that it act as a recognition site for aminoacyl-tRNA synthetase, an enzyme involved in the aminoacylation of the tRNA molecule. The D stem is also believed to have a recognition role although this is yet to be proved.
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