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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Recent advances on polyproline II.

Tarun Jairaj Narwani1,2,3,4, Hubert Santuz1,2,3,4, Nicolas Shinada1,2,3,4,5

  • 1INSERM, U 1134, DSIMB, 6, rue Alexandre Cabanel, 75739, Paris Cedex 15, France.

Amino Acids
|February 11, 2017
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Summary
This summary is machine-generated.

The polyproline II helix (PPII) is an underappreciated protein structure. Recent research highlights its prevalence, functional roles in interactions, and involvement in diseases and protein dynamics.

Keywords:
FrameworksLocal protein conformationsSecondary structureSequence structure relationshipStructural alphabet

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Computational Biology

Background:

  • Globular proteins primarily consist of alpha-helices and beta-sheets, with irregular structures like turns and coils comprising the remainder.
  • Regular secondary structures, beyond helices and sheets, are often overlooked despite their biological significance.
  • The polyproline II helix (PPII) is a notable regular secondary structure with unique properties and increasing recognition.

Purpose of the Study:

  • To review current knowledge and recent advancements in the study of polyproline II helices (PPII).
  • To present methodologies for assigning PPII conformations.
  • To explore the structural and functional implications of PPII, including its role in diseases and protein dynamics.

Main Methods:

  • Review of existing literature on PPII structures and methodologies.
  • Analysis of recent case studies on PPII in protein structures, diseases, and dynamics.
  • Presentation of assignment approaches for PPII conformations.

Main Results:

  • PPII structures are more frequent than previously anticipated and are not typically associated with conventional stabilizing interactions.
  • PPII conformations are implicated in crucial biological processes such as protein-protein and protein-nucleic acid interactions.
  • Recent studies have elucidated PPII's role in disease mechanisms (e.g., hypogonadism) and drug design, as well as its contribution to protein dynamics and disordered regions.

Conclusions:

  • The polyproline II helix (PPII) is an important, yet often ignored, structural motif in proteins.
  • Systematic analysis of PPII is hindered by a lack of dedicated assignment approaches.
  • Further research into PPII structures offers significant potential for understanding protein function, disease, and therapeutic development.