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D arm
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.
It is a highly variable region and is notable for its unusual conformation due to the over-crowding on one of the guanosine residues. It appears to play a large role in the stabilization of the tRNA's tertiary structure.
==References==
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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