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反密码子在甲硫氨酰 - tRNA合成酶与细菌起始tRNA相互作用中的作用。

The role of the anticodon in the interaction between methionyl-tRNA synthetase and bacterial initiator tRNA.

作者信息

Bruton C J, Clark B F

出版信息

Nucleic Acids Res. 1974 Feb;1(2):217-21. doi: 10.1093/nar/1.2.217.

Abstract

Complementary and antiparallel oligonucleotides bind to exposed regions of the tRNA molecule. Aminoacylation in the presence of triplets has been used to determine the role of the anticodon in the interaction between methionyl-tRNA synthetase and initiator tRNA. ApUpG has no effect on the charging even when 70% of the tRNA is bound to the triplet, whereas in the presence of GpGpU which binds to the A-C-C sequence adjacent to the 3' terminal adenosine that fraction of the tRNA which is bound to the triplet is completely unavailable for charging. Hence the anticodon is probably not involved in a primary interaction while the A-C-C-A-OH clearly is. This conclusion is supported by the failure of the isolated anticodon loop and stem oligonucleotides to inhibit the aminoacylation reaction.

摘要

互补且反平行的寡核苷酸与tRNA分子的暴露区域结合。在三联体存在的情况下进行氨酰化反应,已被用于确定反密码子在甲硫氨酰-tRNA合成酶与起始tRNA相互作用中的作用。即使70%的tRNA与三联体结合,ApUpG对氨酰化反应也没有影响,而在与3'末端腺苷相邻的A-C-C序列结合的GpGpU存在时,与三联体结合的那部分tRNA完全无法进行氨酰化反应。因此,反密码子可能不参与主要相互作用,而A-C-C-A-OH显然参与其中。分离的反密码子环和茎寡核苷酸不能抑制氨酰化反应,这一结论得到了该结果的支持。

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