Download MendeleyThe DRS-AIMP2-EPRS subcomplex acts as a pivot in the multi-tRNA synthetase complex.
Hahn, H., Park, S.H., Kim, H.J., Kim, S., Han, B.W.(2019) IUCrJ 6: 958-967
- PubMed: 31576228
- DOI: https://doi.org/10.1107/S2052252519010790
- Primary Citation of Related Structures:
6IY6 - PubMed Abstract:
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 (AIMP2 GST and EPRS GST , respectively). While AIMP2 GST and EPRS GST interact via conventional GST heterodimerization, DRS strongly interacts with AIMP2 GST via hydrogen bonds between the α7-β9 loop of DRS and the β2-α2 loop of AIMP2 GST , where Ser156 of AIMP2 GST is essential for the assembly. Structural analyses of DRS-AIMP2 GST -EPRS GST reveal its pivotal architecture in the MSC and provide valuable insights into the overall assembly and conditionally required disassembly of the MSC.
Organizational Affiliation:
Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea.
