...
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Toward understanding phosphoseryl-tRNA~(Cys) formation: The crystal structure of Methanococcus maripaludis phosphoseryl-tRNA synthetase
【24h】

Toward understanding phosphoseryl-tRNA~(Cys) formation: The crystal structure of Methanococcus maripaludis phosphoseryl-tRNA synthetase

机译:理解磷酸丝氨酸-tRNA〜(Cys)的形成:马氏甲烷球菌磷酸丝氨酸-tRNA合成酶的晶体结构

获取原文
获取原文并翻译 | 示例
           

摘要

A number of archaeal organisms generate Cys-tRNA~(Cys) in a two-step pathway, first charging phosphoserine (Sep) onto tRNA~(Cys) and subsequently converting it to Cys-tRNA~(Cys). We have determined, at 3.2-A resolution, the structure of the Methanococcus maripaludis phosphoseryl-tRNA synthetase (SepRS), which catalyzes the first step of this pathway. The structure shows that SepRS is a class II, α_4 synthetase whose quaternary structure arrangement of subunits closely resembles that of the heterotetrameric (αβ)_2 phenylalanyl-tRNA synthetase (PheRS). Homology modeling of a tRNA complex indicates that, in contrast to PheRS, a single monomer in the SepRS tetramer may recognize both the acceptor terminus and anticodon of a tRNA substrate. Using a complex with tungstate as a marker for the position of the phosphate moiety of Sep, we suggest that SepRS and PheRS bind their respective amino acid substrates in dissimilar orientations by using different residues.
机译:许多古细菌生物体通过两步途径生成Cys-tRNA〜(Cys),首先将磷酸丝氨酸(Sep)加载到tRNA〜(Cys)上,然后将其转化为Cys-tRNA〜(Cys)。我们已经在3.2-A的分辨率下确定了马氏甲烷球菌磷酸丝氨酰tRNA合成酶(SepRS)的结构,该酶催化了该途径的第一步。结构表明SepRS是II类α_4合成酶,其亚基的四级结构排列与异四聚(αβ)_2苯丙氨酰-tRNA合成酶(PheRS)的结构非常相似。 tRNA复合物的同源性建模表明,与PheRS相比,SepRS四聚体中的单个单体可以识别tRNA底物的受体末端和反密码子。使用具有钨酸盐的复合物作为Sep的磷酸部分位置的标记,我们建议SepRS和PheRS通过使用不同的残基以不同的方向结合各自的氨基酸底物。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号