it forms a complex with vanadate ( association constant k approximately 145 +/- 30 m-1 ; delta ( 51v ) = -514 ppm ) with spectral features similar to the less stable complexes obtained with di- and tripeptides ( gly-his , pros-his-ala , gly-his-lys , val-glu ) containing amino acids that are constituents at the active site of the enzyme .
C0017890
gly
C0002520
amino acids