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Related Experiment Videos

Interaction between human tRNA synthetases involves repeated sequence elements

S B Rho1, K H Lee, J W Kim

  • 1Department of Biology, Sung Kyun Kwan University, Suwon, Kyunggido, South Korea.

Proceedings of the National Academy of Sciences of the United States of America
|September 17, 1996
PubMed
Summary
This summary is machine-generated.

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Aminoacyl-tRNA synthetases form a complex in higher eukaryotes. Repeating sequence motifs mediate interactions between these synthetases, with multiple motifs enhancing binding strength for complex assembly.

Area of Science:

  • Molecular Biology
  • Protein Interactions

Background:

  • Higher eukaryotes feature a multiprotein complex of aminoacyl-tRNA synthetases.
  • Understanding the sequence elements governing this complex assembly is crucial.

Purpose of the Study:

  • To identify sequence elements responsible for aminoacyl-tRNA synthetase complex assembly.
  • To investigate the role of specific protein regions and motifs in mediating interactions.

Main Methods:

  • Yeast two-hybrid system was employed to screen for interacting proteins.
  • Human cytoplasmic isoleucyl-tRNA synthetase C-terminal region was used as bait.
  • HeLa cDNA library was screened to identify binding partners.

Main Results:

  • Repeating sequence units in isoleucyl-tRNA synthetase and bifunctional tRNA synthetase mediate interactions.

Related Experiment Videos

  • Multiple motifs enhance binding affinity compared to single motifs.
  • Human glycyl-tRNA synthetase, not part of the complex, also showed interaction via its N-terminal motif.

    • Conclusions:

    • The multiplicity of binding motifs is essential for strengthening interactions among tRNA synthetases.
    • This motif multiplicity likely plays a key role in the formation of the multi-tRNA synthetase complex.