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Changing the Apoptosis Pathway through Evolutionary Protein Design.

David Shultis1, Pralay Mitra1, Xiaoqiang Huang1

  • 1Department of Computational Medicine and Bioinformatics, University of Michigan, 100 Washtenaw Avenue, Ann Arbor, MI 48109, USA.

Journal of Molecular Biology
|January 10, 2019
PubMed
Summary
This summary is machine-generated.

Computational protein design can now create functional proteins by using evolutionary data to guide simulations. This method successfully redesigned a protein to bind Smac peptides while losing its ability to inhibit cell death, showing potential for apoptosis pathway modification.

Keywords:
XIAPapoptosis pathwayevolutionary profileisothermal calorimetryprotein design

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • De novo protein design faces challenges due to the extensive sequence space.
  • Evolutionary information and atomic-level interactions are crucial for designing functional proteins.

Purpose of the Study:

  • To develop a novel computational method for de novo protein design.
  • To redesign the BIR3 domain of X-linked inhibitor of apoptosis protein (XIAP) to alter its function.

Main Methods:

  • Utilized structural profiles from evolutionarily related proteins to constrain simulation searches.
  • Incorporated atomic-level ligand-protein binding interactions to specify protein functions.
  • Applied the method to redesign the BIR3 domain of XIAP.

Main Results:

  • Designed XIAP domains exhibited strong binding to Smac peptides.
  • Designed proteins showed significantly reduced inhibition of caspase-9 activity compared to wild-type XIAP.
  • Mutation assays indicated that binding specificity is determined by structural profiles and physical interactions.

Conclusions:

  • The developed computational approach effectively redesigns protein function.
  • This method demonstrates potential for modifying apoptosis pathways through targeted protein design.