Ethylene Binding and Evidence that Binding InVivo and InVitro is to the Physiological Receptor
A major question concerning the role of ethylene is, “How does it act?” Does it act as a hormone by binding to a receptor, or does it act as a cofactor in some reaction, or does it act as a product of an enzyme which catalyzes the reaction of ethylene with something else? All of these questions have been considered and attempts have been made to determine which is correct. Abeles et al. (4) and Suffix (6) have conducted experiments to determine if hydrogen is exchanged during ethylene action. The results with deuterium were negative. Provided that the method is sufficiently sensitive, hydrogen exchange seems to be ruled out. Experiments have also been conducted to see if the conversion of ethylene to ethylene oxide and some subsequent action of that metabolite is the mode of action of ethylene (7). Although the correlation of ethylene oxidation and action was fairly good, it has been shown that inactivation of the ethylene-oxidizing system does not prevent the action of ethylene (1). This seems to rule out the oxidation of ethylene as the primary mode of action of ethylene.
KeywordsUrea Respiration Carbon Monoxide Cyanide Cyclohexene
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