Fibrous proteins: new structural and functional aspects revealed

Area of Science:

• Structural biology
• Biochemistry
• Molecular biology

Background:

• Coiled-coil proteins, collagen, and elastomers are crucial fibrous proteins.
• Alpha-fibrous coiled-coil proteins, including intermediate filament proteins, spectrin superfamily, and fibrin-fibrinogen, are widespread.
• Collagen and elastic fibers are vital mechanical components of connective tissues.

Purpose of the Study:

• To discuss alpha-fibrous coiled-coil proteins, collagen, and elastomers.
• To elucidate the design principles governing the structures of coiled-coil proteins.
• To detail the ultrastructures of connective tissues and the role of collagen and elastic fibers.

Main Methods:

• Analysis of crystal structure data for coiled-coil proteins and collagen peptides.
• Description of the ultrastructure of connective tissues, including collagen fibril arrangement and elastic fibers.
• Characterization of naturally occurring and engineered mutants to study protein structure-function relationships.

Main Results:

• Design principles of coiled-coil proteins are becoming discernible with high confidence.
• Crystal structures of collagen peptides reveal sequence effects on molecular conformation.
• Ultrastructure of connective tissues is defined by the spatial arrangement of collagen fibrils and networks.

Conclusions:

• Significant progress has been made in understanding the structure and function of fibrous proteins.
• Structural data, particularly crystal structures, are key to deciphering protein design principles.
• Studying mutants, both natural and engineered, provides critical insights into protein function and disease states.