albuminóideas

Albuminoid, also known as scleroprotein, is a class of fibrous proteins that are insoluble in water and most organic solvents. These proteins are characterized by their high content of sulfur-containing amino acids, particularly cysteine. Albuminoids are structural proteins, meaning they primarily serve to provide support and strength to tissues. They are a major component of connective tissues in animals, including skin, hair, nails, feathers, cartilage, and bone.

Key examples of albuminoids include keratin, found in hair, nails, and the outer layers of skin; collagen, the most abundant protein in mammals, forming the framework of tendons, ligaments, cartilage, and bones; and elastin, which provides elasticity to tissues like skin, lungs, and blood vessels. These proteins are formed through the translation of mRNA transcribed from genes encoding specific albuminoid sequences. Their unique structural properties arise from their amino acid composition and the way these amino acids are arranged into stable, often repeating, polypeptide chains. The cross-linking of these chains through disulfide bonds in keratin and other modifications contributes significantly to their resilience and mechanical strength. Albuminoids are generally resistant to enzymatic degradation, contributing to their role in long-lasting structural support.