[High-sulfur protein subunits in keratins]

Area of Science:

• Biochemistry
• Structural Biology

Context:

• Keratins are structural proteins crucial for epithelial cell integrity.
• Their quaternary structure is stabilized by specific protein subunits.

Purpose:

• To elucidate the role of sulfur-rich protein subunits in keratin's quaternary structure and stability.

Summary:

• Keratins' quaternary structure includes up to 40% sulfur-rich protein subunits (cystine, cysteine derivatives).
• These low-molecular-weight, heterogeneous proteins form the keratin matrix, stabilizing structure via disulfide bonds.
• They confer resistance to solution and proteolytic enzymes.

Impact:

• Understanding keratin stabilization mechanisms.
• Potential applications in biomaterials and therapeutic protein stabilization.