the phenylalanyl-trna synthetases from escherichia coli , saccharomyces cerevisiae , neurospora crassa , and turkey liver activate a number of phenylalanine analogues ( tyrosine , leucine , methionine , p-fluorophenylalanine , beta-phenylserine , beta-thien-2-ylalanine , 2-amino-4-methylhex-4-enoic acid , mimosine , n-benzyl-l- or n-benzyl-d-phenylalanine , and ochratoxin a ) , as demonstrated by km and kcat of the atp/ppi pyrophosphate exchange .
C0030137
p-fluorophenylalanine
C0031453
phenylalanine