6ILD

Crystal Structure of Human LysRS: P38/AIMP2 Complex II


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.155 

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Literature

Retractile lysyl-tRNA synthetase-AIMP2 assembly in the human multi-aminoacyl-tRNA synthetase complex.

Hei, Z.Wu, S.Liu, Z.Wang, J.Fang, P.

(2019) J Biol Chem 294: 4775-4783

  • DOI: 10.1074/jbc.RA118.006356
  • Primary Citation of Related Structures:  
    6ILD, 6ILH

  • PubMed Abstract: 
  • 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. Previous studies have shown that the MSC can respond to external signals by releasing its components to function outside it ...

    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. Previous 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. We found 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.


    Organizational Affiliation

    From the State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200032, China fangpengfei@sioc.ac.cn.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Lysine--tRNA ligaseA, B513Homo sapiensMutation(s): 0 
Gene Names: KARSKIAA0070KARS1
EC: 2.7.7 (PDB Primary Data), 6.1.1.6 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q15046 (Homo sapiens)
Explore Q15046 
Go to UniProtKB:  Q15046
PHAROS:  Q15046
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15046
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Aminoacyl tRNA synthase complex-interacting multifunctional protein 2C44Homo sapiensMutation(s): 0 
Gene Names: AIMP2JTV1PRO0992
UniProt & NIH Common Fund Data Resources
Find proteins for Q13155 (Homo sapiens)
Explore Q13155 
Go to UniProtKB:  Q13155
PHAROS:  Q13155
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13155
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.155 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.511α = 90
b = 100.074β = 90
c = 270.98γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina21778064
National Natural Science Foundation of ChinaChina21778067

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-27
    Type: Initial release
  • Version 1.1: 2019-04-10
    Changes: Data collection, Database references