114 



MICROSOMAL PARTICLES 



firefly luciferase; they have also obtained evidence for tight binding of this 

 intermediate to the enzyme. 



Recent studies in our laboratory indicate that the affinity of the tryptophan- 

 activating enzyme is greater for L-tryptophanyl adenylate than for D-trypto- 

 phanyl adenylate and a number of the other ot-aminoacyl adenylates listed in 

 table 1. 



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