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1¡¢Uncharged tRNA :¿ÕÔØtRNA¡£Ö¸Î´Á¬½Ó°±»ùËáµÄtRNA ·Ö×Ó¡£ 2¡¢tRNAÊÇͨ¹ý·Ö×ÓÖÐ3¡ä¶ËµÄCCAЯ´ø°±»ùËáµÄ.°±»ùËáÁ¬½ÓÔÚÏÙÜÕËáµÄ 2¡ä»ò3¡äOH»ùÉÏ, Я´øÁ˰±»ùËáµÄtRNA½Ð°±õ£tRNA,ÀýÈç,Я´ø¸Ê°±ËáµÄtRNA½Ð¸Ê°±õ£tRNA.°±»ùËáÓëtRNAµÄ½áºÏÓɰ±õ£tRNAºÏ³Éø´ß»¯,·Ö¶þ²½½øÐÐ:¢Ù°±»ùËá+ATP¡ú°±õ£-AMP+½¹Á×Ëá;¢Ú°±õ£-AMP+tRNA¡ú°±õ£-tRNA+AMP. 3¡¢Uncharged tRNA is known to bind to the ribosome in a codon-specific fashion. Uncharged tRNA has been shown in vivo to have an active role both in the stringent response, and in modulating the rate of translational elongation |

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