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Super-secondary structures involving triple-strand beta-sheets

A V Efimov1

  • 1Institute of Protein Research, Russian Academy of Sciences, Pushchino.

FEBS Letters
|November 22, 1993
PubMed
Summary

Triple-strand beta-sheets, found in proteins as S-like and Z-like forms, exhibit unique handedness in their higher-order super-secondary structures. These structures can exclusively comprise either S-like or Z-like beta-sheets.

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Area of Science:

  • Protein structure and bioinformatics
  • Structural biology
  • Biophysics

Background:

  • Triple-strand beta-sheets with up-and-down topology are common in protein structures.
  • These beta-sheets exist in two distinct forms: S-like and Z-like.
  • They often form part of larger, more complex super-secondary structures.

Purpose of the Study:

  • To describe various super-secondary structures incorporating triple-strand beta-sheets.
  • To highlight the characteristic handedness of these protein structures.
  • To differentiate structures based on their constituent S-like or Z-like beta-sheets.

Main Methods:

  • Analysis of protein structural databases.
  • Identification and classification of super-secondary structures.
  • Topological and stereochemical analysis of beta-sheet arrangements.

Main Results:

  • Several super-secondary structures containing triple-strand beta-sheets were identified and characterized.
  • A consistent, unique handedness was observed in these super-secondary structures.
  • Structures were found to be composed exclusively of either S-like or Z-like beta-sheets, not a mixture.

Conclusions:

  • Triple-strand beta-sheets are fundamental building blocks in protein architecture.
  • The handedness of super-secondary structures is a conserved feature.
  • The specific type of beta-sheet (S-like or Z-like) dictates the nature of the resulting super-secondary structure.

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