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The polypeptide composition of bovine epidermal alpha-keratin
The Biochemical Journal
|December 1, 1975
Summary
Researchers fractionated bovine epidermis alpha-keratin polypeptide chains, identifying three distinct groups based on their properties. These findings advance our understanding of keratin structure and function in skin.
Area of Science:
- Biochemistry
- Dermatology
- Structural Biology
Background:
- Tonofilaments, the alpha-keratin component of bovine epidermis, are crucial structural elements in skin.
- Understanding the heterogeneity of polypeptide chains within tonofilaments is key to elucidating their function.
Purpose of the Study:
- To fractionate and characterize the polypeptide chains of bovine epidermal alpha-keratin.
- To classify these polypeptide chains into distinct groups based on biochemical and structural properties.
Main Methods:
- Fractionation using DEAE-cellulose chromatography and preparative polyacrylamide-gel electrophoresis.
- Analysis of polypeptide properties including molecular weight, alpha-helix content, amino acid composition, and N-terminal residues.
Main Results:
- Seven distinct polypeptide chains of bovine epidermal alpha-keratin were investigated.
- Polypeptide chains were classified into three groups based on similarities in alpha-helix content and amino acid composition.
- Group one (polypeptides 1a, 1b) had MW 58,000 and ~25% alpha-helix; group two (polypeptides 2, 3, 4) had MW 52,000-56,000 and ~48% alpha-helix; group three (polypeptides 5, 6) had MW 47,000-48,000 and ~56% alpha-helix.
Conclusions:
- Bovine epidermal alpha-keratin is composed of multiple polypeptide chains that can be categorized into three main groups.
- These groups exhibit distinct structural characteristics, suggesting specialized roles within the tonofilament structure.