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Related Experiment Videos

Functional assembly of a randomly cleaved protein.

K Shiba1, P Schimmel

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Proceedings of the National Academy of Sciences of the United States of America
|March 1, 1992
PubMed
Summary
This summary is machine-generated.

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Large protein assembly, like aminoacyl-tRNA synthetases, can be reconstructed from disconnected fragments. This suggests flexible chain packing and flexibility are key to protein structure evolution and formation.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Evolution

Background:

  • Aminoacyl-tRNA synthetases are essential enzymes involved in protein synthesis.
  • Understanding the assembly of large proteins is crucial for comprehending their function and evolution.

Purpose of the Study:

  • To investigate the principles governing the assembly of large, multi-domain proteins.
  • To determine if large protein structures can be reconstructed from smaller, complementary fragments.

Main Methods:

  • Sequence alignment of a 939-amino acid aminoacyl-tRNA synthetase with 15 related proteins.
  • Design and testing of 18 fragment pairs for internal sequence complementarity.
  • Assessing enzyme activity reconstitution upon fragment reassembly.

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Main Results:

  • Successful reconstitution of enzyme activity using fragments that divide the protein at conserved and nonconserved regions.
  • Demonstration that structure assembly accommodates insertions of unrelated sequences at fragment junctions.
  • Evidence of widely distributed chain packing interactions and flexibility enabling reconstruction of 3D structures from disparate pieces.

Conclusions:

  • Large protein structures can be assembled from fragments, indicating inherent flexibility in protein folding.
  • The findings suggest that protein assembly is a flexible process, with implications for protein evolution.
  • Complementary chain packing and flexibility are fundamental to the reconstruction of complex protein architectures.