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  • Title: The role of S-adenosylmethionine in the cleavage of deoxyribonucleic acid by the restriction endonuclease from Escherichia coli K.
    Author: Hadi SM, Bickle TA, Yuan R.
    Journal: J Biol Chem; 1975 Jun 10; 250(11):4159-64. PubMed ID: 1092685.
    Abstract:
    The restriction endonuclease from Escherichia coli K specifically cleaves foreign DNA in the presence of S-adenosylmethionine, ATP, and Mg2+. The role of S-adenosylmethionine in this reaction has been studied by following the specific binding of the enzyme to unmodified DNA. The results indicate that S-adenosylmethionine acts as an allosteric effector. However, the rate-limiting step in the activation of the enzyme is not the binding of the effector itself, but an event subsequent to it. The interaction of the S-adenosylmethionine with two mutant K restriction endonucleases isolated previously has also been investigated. One of them, which is defective in restriction, can be activated in a manner similar to the wild type enzyme, while the other one, which lacks both restriction and modification activities (due to a mutation in the subunit responsible for DNA recognition), shows no such effect.
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