Macromolecules consisting of long sequences of alpha-amino acids (H N-CHR-COOH] in peptide (amide) linkage(elimination of hLO between the alpha-NhL and alpha-COOH of successive residues). Protein is three-fourths of the dryweight of most cell matter and is involved in structures, hormones, enzymes, muscle contraction, immunological responseand essential life functions.
The amino acids involved are generally the 20 alpha-amino acids (glycine, L-alanine, etc.)recognized by the genetic code. Cross-links yielding globular forms of protein are often effected through the -SH groups oftwo sulfur-containing L-cysteinyl residues, as well as by noncovalent forces (hydrogen bonds, lipophilic attractions, etc.)..
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