古菌依赖tRNA的氨基转移酶GatCAB与tRNA(Asn)的共同进化。
Co-evolution of the archaeal tRNA-dependent amidotransferase GatCAB with tRNA(Asn).
作者信息
Namgoong Suk, Sheppard Kelly, Sherrer R Lynn, Söll Dieter
机构信息
Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520 8114, USA.
出版信息
FEBS Lett. 2007 Jan 23;581(2):309-14. doi: 10.1016/j.febslet.2006.12.033. Epub 2007 Jan 2.
Abstract
The important identity elements in tRNA(Gln) and tRNA(Asn) for bacterial GatCAB and in tRNA(Gln) for archaeal GatDE are the D-loop and the first base pair of the acceptor stem. Here we show that Methanothermobacter thermautotrophicus GatCAB, the archaeal enzyme, is different as it discriminates Asp-tRNA(Asp) and Asp-tRNA(Asn) by use of U49, the D-loop and to a lesser extent the variable loop. Since archaea possess the tRNA(Gln)-specific amidotransferase GatDE, the archaeal GatCAB enzyme evolved to recognize different elements in tRNA(Asn) than those recognized by GatDE or by the bacterial GatCAB enzyme in their tRNA substrates.
摘要
细菌GatCAB中tRNA(Gln)和tRNA(Asn)以及古菌GatDE中tRNA(Gln)的重要识别元件是D环和受体茎的第一个碱基对。在此我们表明，嗜热栖热甲烷杆菌的GatCAB（一种古菌酶）有所不同，因为它通过U49、D环以及在较小程度上通过可变环来区分Asp-tRNA(Asp)和Asp-tRNA(Asn)。由于古菌拥有tRNA(Gln)特异性氨基转移酶GatDE，古菌的GatCAB酶在进化过程中识别tRNA(Asn)中的不同元件，这些元件不同于GatDE或细菌GatCAB酶在其tRNA底物中识别的元件。
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