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2'-Deoxyadenosine and 9-beta-D-arabinofuranosyladenine (ARA) are apparent suicide inhibitors for equine S-adenosylhomocysteine hydrolase. In initial velocity studies of the synthetic reaction converting adenosine and homocysteine to S-adenosylhomocysteine, adenine, adenosine 5'-triphosphate, and 9-beta-D-arabinofuranosyladenine were found to be competitive inhibitors with Kis of 3.8 microM, 1.1 mM, and 30 microM, respectively. In contrast, linear mixed inhibition was observed for 2'-deoxyadenosine, indicating that 2'-deoxyadenosine must bind in more than one fashion to the enzyme.  相似文献   

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