Abstract

Soluble adenosine-binding proteins were first described by Yuh and Tao in rabbit erythrocytes [1], and similar proteins were later isolated from various eukaryotes [2–8]. The physiological role of these binding proteins for adenosine (Ado) remained obscure until Hershfield [9] and Hershfield and Kredich [10] demonstrated that such proteins from human placenta, spleen, and lymphoblasts were identical to S-adenosylhomocysteine (AdoHcy) hydrolase (EC: 3.3.1.1), the enzyme responsible for the metabolic degradation of the endogenous transmethylase inhibitor, AdoHcy [11]. This finding has been confirmed by others [12–14]. This chapter is a brief review of the properties of AdoHcy hydrolase, with emphasis on the interaction of the enzyme with Ado.

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