the prt of strain lt7 further differs from that of strain lt2 in that its apparent km for 5-phosphoribosylpyrophosphate is three to seven times higher when associated with anthranilate synthase in the enzyme complex which catalyses the first two steps of tryptophan biosynthesis than in its free uncomplexed form , which the prt of strain lt2 shows the same apparent km for this substrate in both its free and complexed forms .
C0003169
anthranilate synthase
C0026741
enzyme complex