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Identification of Functional Protein Regions Through Chimeric Protein Construction
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Chimeric approach for narrowing a membrane-inserting region within human perforin.

Amy E Neely1, Kimberly A Mandigo1, Rebekah L Robinson1,2

  • 1Department of Chemistry and Physics, Armstrong State University, Savannah, GA 31419, USA.

Protein Engineering, Design & Selection : PEDS
|December 17, 2016
PubMed
Summary

This study reveals that perforin

Keywords:
MACPFTMHperforinperfringolysin-Opore formation

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Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • Perforin is a crucial immune protein forming pores in target cells.
  • Bacterial cholesterol-dependent cytolysins (CDCs) offer a model for perforin's pore formation.
  • Both perforin and CDCs share conserved structural elements, including alpha-helices.

Purpose of the Study:

  • To investigate the membrane-insertion potential of perforin's helical regions.
  • To determine if perforin's helices function as transmembrane helices (TMHs).
  • To identify key residues involved in perforin's membrane insertion mechanism.

Main Methods:

  • Construction of chimeric proteins using perfringolysin-O (PFO) as a backbone.
  • Replacement of PFO's TMH2 region with perforin's corresponding helical region.
  • Truncation of the inserted perforin region to match PFO's TMH2 length and assessment of chimera properties.

Main Results:

  • A chimera with the full-length perforin region showed hemolytic activity but poor solubility.
  • A truncated chimera exhibited improved solubility and significant hemolytic activity.
  • The truncated chimera successfully formed pores characteristic of PFO.

Conclusions:

  • Provides the first evidence that perforin's helices function as transmembrane helices (TMHs).
  • Demonstrates that perforin's helical regions are capable of membrane insertion.
  • Narrows down the specific residues responsible for perforin's membrane insertion.