Stereochemical mechanisms of tRNA methyltransferases.

Stereochemical mechanisms of tRNA methyltransferases.
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tRNA甲基转移酶的立体化学机制。

DOI:
10.1016/j.febslet.2009.11.075
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发表时间:
2010-01-21
期刊:
影响因子:
3.5
通讯作者:
Perona JJ
Perona JJ
中科院分区:
生物学3区
文献类型:
--
作者:
Hou YM;Perona JJ

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TRNA在四个典型碱基上的甲基化增加了分子的结构复杂性,并提高了解码的特异性和效率。虽然已知许多tRNA甲基酶,但对其催化机制的详细了解仅在少数情况下可用。在所有tRNA甲基酶中,令人感兴趣的是核苷酸选择的结构基础,通过这种结构基础,特异性被限制在单个位点,或者被扩大到多个位点。催化的一般主题包括在高度不同的亲核中心加速甲基转移的基础,使用S-腺苷蛋氨酸作为辅助因子。对tRNA甲基酶的研究也对分子进化产生了见解,特别是在识别不同结构的酶在同一目标核苷酸上执行相同反应的情况下。
Methylation of tRNA on the four canonical bases adds structural complexity to the molecule, and improves decoding specificity and efficiency. While many tRNA methylases are known, detailed insight into the catalytic mechanism is only available in a few cases. Of interest among all tRNA methylases is the structural basis for nucleotide selection, by which the specificity is limited to a single site, or broadened to multiple sites. General themes in catalysis include the basis for rate acceleration at highly diverse nucleophilic centers for methyl transfer, using S-adenosylmethionine as a cofactor. Studies of tRNA methylases have also yielded insights into molecular evolution, particularly in the case of enzymes that recognize distinct structures to perform identical reactions at the same target nucleotide.
DOI: 10.1128/jb.185.10.3238-3243.2003
发表时间: 2003-05-01
影响因子: 3.2
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De Bie, LGS;Roovers, M;Bujnicki, JM
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