fibrous proteins


The keratin in hair is a fibrous protein.

Fibrous proteins are proteins that tend to be insoluble and strong and so play a structural role in organisms for support or protection. Fibrous proteins can be subdivided into several different types:


· keratins, found in hair, fingernails, and bird feathers


· collagens – the most abundant proteins in a vertebrate body – found in connective tissues such as cartilage


· elastins, found in ligaments, around blood vessels.


Fibrous proteins are one of two main types of protein that have a quaternary structure; the other are globular proteins.