Classification of Proteins
- Created by: zoolouise
- Created on: 02-06-15 18:59
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- Classification of Proteins
- Fibrous Proteins
- They perform a structural role
- They form long chains which run parallel to one another
- The chains are linked by cross-bridges to form stable molecules that form fibres
- For example, collagen found in tendons, the walls of blood vessels, bone and ligaments is made up of three polypeptide chains wound around each other like a rope.
- For example, keratin found in hair. It's the strongest thing known to man for the thickness.
- Fibrous proteins are insoluble in water, strong and tough. They provide tensile strength.
- Primary structure is a repeated sequence of amino acids.
- Globular Proteins
- Over 90% of all proteins are in this specific class.
- They have irregular amino acid sequences of amino acids
- They form compact, spherical structures like a ball of string
- They have relatively unstable structures
- They are soluble.
- For example, enzymes, antibodies, plasma proteins and hormones.
- Haemoglobin is made up of 4 folded polypeptides chains at the centre of which is an iron-containing group called haem.
- Fibrous Proteins
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