the purified enzyme has a specific activity of 810 u/mg , a molecular weight of 28 000 , and the following amino acid composition : 21 aspartic acid or asparagine , 14 threonine , 17 serine , 27 glutamic acid or glutamine , 16 proline , 22 glycine , 22 alanine , 15 valine , 6 methionine , 11 isoleucine , 29 leucine , 5 tyrosine , 7 phenylalanine , 16 lysine , 7 histidine , 19 arginine , 3 half-cystine , and no tryptophan , totalling 257 residues .
C0002520
amino acid
C0061472
glutamic acid