ENZYMES
- USUALLY SPHERICAL - DUE TO TIGHT FOLD OF POLYPEPTIDE CHAINS
- SOLUBLE - ROLES IN METABOLISM
- SOME INVOLVED IN BREAKDOWN AND OTHERS IN SYNTHESIS
ANTIBODIES
- IMMUNE RESPONSE
- 2 LIGHT AND 2 HEAVY POLYPEPTIDE CHAINS - BONDED
- ANTIBODIES - VARIABLE REGIONS - AMINO ACIDS VARY IN THESE REGIONS
TRANSPORT PROTEINS
- E.G - CHANNEL PROTEINS - CELL MEMBRANE
- CHANNEL PROTEINS - HYDROPHOBIC AND HYDROPHILLIC AMINO ACIDS
- CAUSE PROTEIN TO FOLD - FORM CHANNEL
- TRANSPORT MOLECULES AND IONS - ACROSS MEMBRANE
STRUCTURAL PROTEINS
- STRONG
- LONG POLYPEPTIDE CHAINS - PARALLEL - CROSS LINKS
- E.G. KERATIN (NAILS AND HAIR) - COLLAGEN (CONNEC. TISSUE)
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