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Serpin tertiary structure transformation.

P Stein1, C Chothia

  • 1Department of Haematology, University of Cambridge, U.K.

Journal of Molecular Biology
|September 20, 1991
PubMed
Summary
This summary is machine-generated.

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Proteolytic cleavage dramatically transforms serpin structure. A mobile fragment containing alpha-helices and beta-sheets facilitates this conformational change, a mechanism conserved across serpins.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Dynamics

Background:

  • Serpins (serine protease inhibitors) are known for their conformational flexibility.
  • Previous studies showed proteolytic cleavage induces significant tertiary structure changes in serpins.

Purpose of the Study:

  • To elucidate the conformational mechanism underlying serpin structural transformation after cleavage.
  • To understand how cleaved residues become integrated into a beta-sheet structure.

Main Methods:

  • Crystallographic analysis of serpins.
  • Structural comparison of cleaved and uncleaved serpin states.

Main Results:

  • Proteolytic cleavage triggers a major tertiary structure rearrangement in serpins.

Related Experiment Videos

  • A mobile fragment, comprising an alpha-helix and beta-sheet strands, detaches.
  • This fragment's movement creates space for new beta-sheet strand insertion.
  • A novel mechanism involving sliding sheet residues along alpha-helical grooves was identified.

    • Conclusions:

    • The identified mechanism explains how serpins undergo dramatic structural changes upon cleavage.
    • Conserved residues suggest this sliding mechanism is common to all serpins exhibiting this transformation.
    • Understanding this dynamic process is crucial for serpin function and inhibition mechanisms.