The DRS-AIMP2-EPRS subcomplex acts as a pivot in the multi-tRNA synthetase complex

Hyunggu Hahn, Sang Ho Park, Hyun Jung Kim, Sunghoon Kim, Byung Woo Han

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Aminoacyl-tRNA synthetases (ARSs) play essential roles in protein biosynthesis as well as in other cellular processes, often using evolutionarily acquired domains. For possible cooperativity and synergistic effects, nine ARSs assemble into the multi-tRNA synthetase complex (MSC) with three scaffold proteins: aminoacyl-tRNA synthetase complex-interacting multifunctional proteins 1, 2 and 3 (AIMP1, AIMP2 and AIMP3). X-ray crystallographic methods were implemented in order to determine the structure of a ternary subcomplex of the MSC comprising aspartyl-tRNA synthetase (DRS) and two glutathione S-transferase (GST) domains from AIMP2 and glutamyl-prolyl-tRNA synthetase (AIMP2GST and EPRSGST, respectively). While AIMP2GST and EPRSGST interact via conventional GST heterodimerization, DRS strongly interacts with AIMP2GST via hydrogen bonds between the α7-β9 loop of DRS and the β2-α2 loop of AIMP2GST, where Ser156 of AIMP2GST is essential for the assembly. Structural analyses of DRS-AIMP2GST-EPRSGST reveal its pivotal architecture in the MSC and provide valuable insights into the overall assembly and conditionally required disassembly of the MSC.

Original languageEnglish
Pages (from-to)958-967
Number of pages10
Publication statusPublished - 2019 Sept 1

Bibliographical note

Funding Information:
This work was supported by grants (NRF-2013M-3A6A-4043695 and NRF-2011-0030001) from the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Republic of Korea.

Publisher Copyright:
© 2019 International Union of Crystallography. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry
  • Materials Science(all)
  • Condensed Matter Physics


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