The Water Structure in 2Zn Insulin Crystals
Proteins have evolved in an aqueous medium and they have exploited with advantage the bonding and steric properties of the water molecule in achieving their 3 dimensional folding, stability, control of substrate bonding and catalytic reactions. The study of water protein interactions has relied on spectroscopic and calorific methods which generally confirm the essential role water plays in protein structure and folding. The detailed description of the water-protein contacts and the dynamical behaviour of the protein surface atoms and the surrounding water molecules however is a much more challenging undertaking. It must be emphasized that the water molecules on protein surfaces are extremely mobile. They exchange sites very rapidly, even when well ordered by contacts to the protein, and move extensively along the connected networks across the protein. Where there are few specific sites with suitable H bond and other contacts the water molecules exist in a practically continuous population of networks (J Finney, et al., 1982).
KeywordsWater Molecule Water Structure Fold Axis Protein Atom Bonding Contact
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