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Serine, aspartic acid and phenylalanine ...

Serine, aspartic acid and phenylalanine are present at active site of an enzyme. What are the forces responsible for binding of these amino acids to active site?

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`-OH` group of serine binds through H-bonding, `-COO^(ѳ)` group of aspartic acid binds through ionic bonding and `C_6H_5` -group of phenylalanine binds through van der Waals force of attraction.
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