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Related Experiment Videos

Structure and evolution of parallel beta-helix proteins

J Jenkins1, O Mayans, R Pickersgill

  • 1Institute of Food Research, Reading Laboratory, Earley Gate, Whiteknights Road, Reading, RG6 6BZ, United Kingdom.

Journal of Structural Biology
|September 2, 1998
PubMed
Summary
This summary is machine-generated.

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Structural analysis of bacterial pectate lyases, fungal pectin lyase, and phage proteins reveals a shared right-handed parallel beta-helix fold. This conserved architecture suggests divergent evolution from a common ancestor, despite a lack of sequence homology.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Evolution

Background:

  • The right-handed parallel beta-helix is a protein fold found in various enzymes.
  • Pectate lyases, pectin lyase, rhamnogalacturonase A (RGase A), and P22-phage tailspike protein (TSP) are enzymes with known or suspected beta-helix structures.

Purpose of the Study:

  • To investigate the structural similarities and evolutionary relationships between bacterial pectate lyases, fungal pectin lyase, RGase A, and TSP.
  • To determine if these proteins share a common ancestor based on their three-dimensional structures.

Main Methods:

  • Comparative structural analysis of the three-dimensional structures of pectate lyases, pectin lyase, RGase A, and TSP.
  • Examination of conserved structural elements, coil numbers, beta-strand arrangements, and turn regions within the beta-helix fold.

Related Experiment Videos

Main Results:

  • All analyzed proteins share the right-handed parallel beta-helix architecture.
  • Bacterial lyases possess 7 coils, while RGase A and TSP have 11 and 12 coils, respectively.
  • Despite significant structural similarities, sequence homology is not evident between RGase A, TSP, and the lyases, suggesting divergent evolution.

Conclusions:

  • The extensive structural conservation strongly supports divergent evolution from a common ancestor for these proteins.
  • The parallel beta-helix fold appears to be a stable architecture that can maintain conformation over evolutionary time, even with significant sequence divergence.
  • Functional similarities, such as binding alpha-galactose containing polymers, further support a shared evolutionary origin.