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Related Experiment Videos

Sequence and structure analysis of parallel beta helices: implication for constructing amyloid structural models.

Hui-Hsu Gavin Tsai1, Kannan Gunasekaran, Ruth Nussinov

  • 1Department of Chemistry, National Central University, Chung-Li 32001, Taiwan. hhtsai@cc.ncu.edu.tw

Structure (London, England : 1993)
|June 13, 2006
PubMed
Summary
This summary is machine-generated.

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Amyloids and beta helices share structural motifs. Identical amino acid side chains form ladders in parallel beta helices, potentially explaining amyloid formation in polypeptides.

Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Amyloids are protein aggregates implicated in various diseases.
  • Emerging evidence suggests structural similarities between amyloids and parallel beta helices.
  • Understanding these similarities can provide insights into amyloid formation mechanisms.

Purpose of the Study:

  • To systematically analyze the sequence and structural characteristics of parallel beta helices.
  • To identify conserved motifs and preferred amino acid residues within parallel beta helices.
  • To propose a structural model for amyloid formation based on parallel beta helix features.

Main Methods:

  • Sequence and structural analysis of parallel beta helices.
  • Identification of amino acid preferences and stacking patterns.

Related Experiment Videos

  • Comparative analysis with known amyloid structures.

    • Main Results:

    • Isoleucine (Ile) is favored in beta strands, while Proline (Pro) is disfavored.
    • Cysteine (Cys), Asparagine (Asn), and Phenylalanine (Phe) exhibit significant homostacking (identical amino acid interactions).
    • Asparagine (Asn) is conserved in alpha-helical conformations, forming amide stacking.

    Conclusions:

    • Parallel beta helices exhibit prominent stacking of chemically similar residues.
    • Amyloids, within the cross-beta framework, may feature in-register, parallel alignment with identical amino acid side chain ladders.
    • The limited combinations for ladder formation, influenced by environmental factors, likely contribute to the broad amyloidogenic potential of polypeptides.