Fibrous and globular proteins

Fibrous proteins	Globular proteins
Long parallel polypeptide chains.	Coiled and folded into globular shape.
Polypeptide chains from helical structures or pleated sheets held by hydrogen bonds.	Globular structure maintained by hydrogen, ionic, disulphide bonds, hydrophobic interactions and van de Waals interactions.
There is repetitive regular sequence of amino acids.	Irregular amino acid sequence.
Secondary structure most important is carrying out its structural and supporting function Stable structure            Insoluble in water	Tertiary structure determines its metabolic functions Relatively unstable structure  Usually soluble in water, can form colloidal suspension
Actual sequence may vary slightly between two examples of the same protein.	Sequence is highly specific. It does not vary between two examples of the same protein.
Examples are keratin, collagen, elastic and fibroin.	Examples are haemoglobin, myoglobin, enzymes, antibodies and some hormones.