Fibrous proteins

• Fibrous proteins are a category of proteins alongside globular proteins and they have particular features in common such as the 3d tertiary structure and the quaternary structure of a protein which results in a formation of a fibrous protein.
• Fibrous proteins tend to have very similar features in common with each other and it's all designed based on its primary sequence and tertiary structure of amino acids.
• The polypeptide chains of fibrous proteins can form fibers which make the proteins very very strong.
• Fibrous proteins because of their nature tend to have more structural roles in the body as opposed to globular proteins which have more metabolic and functional roles.
• Examples of fibrous proteins include collagen, keratin, and elastin.
• Collagen is a fibrous protein used to provide material for the skeleton to keep our cells upright and give our organs some protection, like in the rib cage.
• Elastin is a fibrous protein with elastic properties, it can stretch and recoil, and is found in the lungs to help them inflate and deflate during ventilation, in the bladder to help it expand when it's holding urine, and in the blood vessel walls to help maintain the blood pressure.
• The primary structure of keratin contains a high amount of cysteine, an amino acid which can form disulfide links between two polypeptide chains, making the whole molecule very hard and very strong.
• Keratin is another example of a fibrous protein which is very hard and very strong, found in parts of the body which are hard such as the fingernails or horns and hooves on animals.
• Collagen is one of the most abundant proteins in the body and its fibers are very very strong, hence it's normally used to provide strength to many parts of the body and various different tissues.
• Collagen is found in artery walls to prevent them from bursting under high blood pressure.
• Collagen is also found in making tendons which connect muscles to the bones, allowing the skeleton to move.
• Keratin is a fibrous protein found in the fingernails.
• Elastin is a fibrous protein important in making tissues stretchy.
• A fibrous protein by definition is a very long strong and insoluble protein which often has a structural role in organisms.
• Collagen is an example of a fibrous protein.