Tuesday 15 July 2014

PROTEINS:: PART 3

PEPTIDES

·       -  Two or more amino acids combine together to form a peptide.
·   -  A peptide is formed when two amino acids are joined by a   peptide bond.
             

·     -  Peptide bond is formed by removal of a water molecule between the carboxyl group of one amino acid and amine group of another amino acid.
·    -   Peptide bond is backbone of protein chain.
·     -  Hence each polypeptide has a free carboxyl terminal (C-) and an amine terminal (N-).
·     -   Classification of amino acids based upon their length:-
Ø  Dipeptide: - made up of 2 amino acids.
Ø  Tripeptide: - made up of 3 amino acids.
Ø  Oligopeptide: - made up of 2-10 amino acids.
Ø  Polypeptide: - made up of 10 or more amino acids.


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