Retractile lysyl-tRNA synthetase-AIMP2 assembly in the human multi-aminoacyl-tRNA synthetase complex
Journal Article
·
· Journal of Biological Chemistry
- Chinese Academy of Sciences (CAS), Shanghai (China)
Multi-aminoacyl-tRNA synthetase complex (MSC) is the second largest machinery for protein synthesis in human cells and also regulates multiple nontranslational functions through its components. Prior studies have shown that the MSC can respond to external signals by releasing its components to function outside it. The internal assembly is fundamental to MSC regulation. Here, using crystal structural analyses (at 1.88 Å resolution) along with molecular modeling, gel-filtration chromatography, and co-immunoprecipitation, we report that human lysyl-tRNA synthetase (LysRS) forms a tighter assembly with the scaffold protein aminoacyl-tRNA synthetase complex-interacting multifunctional protein 2 (AIMP2) than previously observed. Wefound that two AIMP2 N-terminal peptides form an antiparallel scaffold and hold two LysRS dimers through four binding motifs and additional interactions. Of note, the four catalytic subunits of LysRS in the tightly assembled complex were all accessible for tRNA recognition. We further noted that two recently reported human disease-associated mutations conflict with this tighter assembly, cause LysRS release from the MSC, and inactivate the enzyme. These findings reveal a previously unknown dimension of MSC subcomplex assembly and suggest that the retractility of this complex may be critical for its physiological functions.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- Chinese Academy of Sciences (CAS); National Natural Science Foundation of China (NSFC); State Key Laboratory of Bioorganic and Natural Products Chemistry
- OSTI ID:
- 1504973
- Journal Information:
- Journal of Biological Chemistry, Journal Name: Journal of Biological Chemistry Journal Issue: 13 Vol. 294; ISSN 0021-9258
- Publisher:
- American Society for Biochemistry and Molecular BiologyCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
59 BASIC BIOLOGICAL SCIENCES
aminoacyl tRNA synthetase
aminoacyl-tRNA syntheses complex-interacting multifunctional protein 2 (AIMP2)
cardiomyopathy
crystal structure
lysyl-tRNA synthetase (LysRS)
molecular biology
multi-aminoacyl-tRNA syntheses complex (MSC)
protein complex
translation
59 BASIC BIOLOGICAL SCIENCES
aminoacyl tRNA synthetase
aminoacyl-tRNA syntheses complex-interacting multifunctional protein 2 (AIMP2)
cardiomyopathy
crystal structure
lysyl-tRNA synthetase (LysRS)
molecular biology
multi-aminoacyl-tRNA syntheses complex (MSC)
protein complex
translation