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Classification of β-hairpin repeat proteins
Daniel B Roche1, Phuong Do Viet1, Anastasia Bakulina2
1Centre de Recherche en Biologie cellulaire de Montpellier (CRBM), UMR 5237 CNRS, Université Montpellier, 1919 Route de Mende, Cedex 5, Montpellier 34293, France; Institut de Biologie Computationnelle, Montpellier, France.
New research classifies beta-hairpin repeat (BHR) protein structures, revealing six folds in elongated proteins and one in closed structures. This classification aids understanding of BHR proteins in bacteria, viruses, and amyloid fibrils.
Area of Science:
- Structural biology
- Bioinformatics
- Biochemistry
Background:
- Tandem repeats, particularly beta-hairpin repeats (BHR), are increasingly identified in protein structures.
- Existing data necessitates detailed analysis and classification of these BHR structures.
Purpose of the Study:
- To classify beta-hairpin repeat (BHR) proteins.
- To compare BHR structures, repeat motifs, functions, and distribution across life.
- To update the RepeatsDB database with annotated tandem repeat protein structures.
Main Methods:
- Classification of BHR protein structures.
- Comparative analysis of BHR protein sequences and structures.
- Construction of sequence profiles based on structural alignments.
Main Results:
- Identified six distinct BHR folds in Class III (elongated) tandem repeat proteins.
- Identified one BHR fold (up-and-down beta-barrel) in Class IV (closed) tandem repeat proteins.
- Found high prevalence of BHR proteins in bacteria and viruses, with potential links to amyloid fibril structures.
Conclusions:
- BHR protein classification provides a framework for understanding their diversity and distribution.
- BHR proteins are significant in bacteria, viruses, and may relate to amyloidosis.
- BHR folds represent promising targets for future structural studies, particularly concerning age-related diseases and infections.
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