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Related Experiment Videos

Unusual structural features in the parallel beta-helix in pectate lyases

M D Yoder1, S E Lietzke, F Jurnak

  • 1Department of Biochemistry, University of California, Riverside 92521.

Structure (London, England : 1993)
|December 15, 1993
PubMed
Summary

Researchers analyzed the atomic structures of pectate lyases PelC and PelE, discovering novel side chain interactions and a unique beta-sandwich structure within the all parallel beta class. These findings offer insights into protein structural predictions.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Science

Background:

  • A novel 'all parallel beta' domain structure was recently identified in pectate lyases PelC and PelE.
  • Analysis of atomic models was conducted to investigate unusual structural characteristics of this new fold.

Purpose of the Study:

  • To determine if the newly observed tertiary fold in PelC and PelE exhibits unusual structural features.
  • To characterize the novel structural elements within the all parallel beta class.

Main Methods:

  • Detailed analysis of the atomic models of PelC and PelE.
  • Examination of polypeptide backbone and amino acid side chain interactions.
  • Identification and classification of secondary structural elements and novel structural motifs.

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Main Results:

  • No new types of secondary structural elements were found in the polypeptide backbone.
  • Novel amino acid side chain interactions were identified, including asparagine ladders, serine stacks, aliphatic stacks, and ringed-residue stacks.
  • A new type of beta-sandwich structure was observed between parallel beta-sheets, exhibiting characteristics typically associated with antiparallel beta-sheets.

Conclusions:

  • The PelC and PelE structures, representing an all parallel beta class, display unique amino acid side chain interactions and a novel beta-sandwich.
  • An atypical amino acid composition was noted within the parallel beta-sheets.
  • These structural findings have implications for predicting three-dimensional protein structures.