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A helix-turn-strand structural motif common in alpha-beta proteins
P A Rice1, A Goldman, T A Steitz
1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06511.
Proteins
|January 1, 1990
Summary
A common structural motif, characterized by a constrained turn and hydrophobic interactions, is found in alpha-beta barrel proteins. This motif may serve as a fundamental building block for these protein structures.
Area of Science:
- Structural biology
- Protein folding and dynamics
Background:
- Alpha-beta barrel proteins are common protein structures.
- Understanding their building blocks is key to protein engineering and drug design.
Purpose of the Study:
- To identify and characterize common structural motifs in alpha-beta barrel proteins.
- To investigate the role of these motifs in protein structure and evolution.
Main Methods:
- Exhaustive structural comparisons of alpha-helix-turn-beta-strand polypeptides.
- Analysis of turn geometry and hydrophobic interactions within protein domains.
Main Results:
- Approximately one-third of alpha-beta barrel polypeptides share a common structural motif.
- This motif features constrained turn geometry and specific hydrophobic packing between helices and strands.
- The motif is less frequent in flat-sheet proteins and when turn geometry is less constrained.
Conclusions:
- A conserved structural motif may be a fundamental building block for alpha-beta barrels.
- The identified motif's characteristics are crucial for the stability and formation of barrel structures.
- Further research could explore the motif's role in protein evolution and function.