文章基本信息

标题：Structural context for mobilization of a human tRNA synthetase from its cytoplasmic complex
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作者：Pengfei Fang ; Hui-Min Zhang ; Ryan Shapiro 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2011
卷号：108
期号：20
页码：8239-8244
DOI：10.1073/pnas.1100224108
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Human lysyl-tRNA synthetase is bound to the multi-tRNA synthetase complex (MSC) that maintains and regulates the aminoacylation and nuclear functions of LysRS. The p38 scaffold protein binds LysRS to the MSC and, only with the appropriate cue, mobilizes LysRS for redirection to the nucleus to interact with the microphthalmia associated transcription factor (MITF). In recent work, an (2)2 LysRS tetramer crystallized to yield a high-resolution structure and raised the question of how LysRS is arranged (dimer or tetramer) in the MSC to interact with p38. To understand the structural organization of the LysRS-p38 complex that regulates LysRS mobilization, we investigated the complex by use of small angle X-ray scattering and hydrogen-deuterium exchange with mass spectrometry in solution. The structure revealed a surprising 2{beta}1:{beta}12 organization in which a dimeric p38 scaffold holds two LysRS 2 dimers in a parallel configuration. Each of the N-terminal 48 residues of p38 binds one LysRS dimer and, in so doing, brings two copies of the LysRS dimer into the MSC. The results suggest that this unique geometry, which reconfigures the LysRS tetramer from 2:2 to 2{beta}1:{beta}12, is designed to control both retention and mobilization of LysRS from the MSC.
关键词：noncanonical function ; p38/AIMP2 ; structural plasticity