What happens if there are lots of reactions associated with a single enzyme?
There are two main cases where multiple reactions are associated with a single enzyme. The first is where several different substrates can be used, leading to different products. These are called alternative reactions. The second is where consecutive reactions are catalysed by the same enzyme, i.e. the product of the first reaction becomes the substrate for the second reaction etc. For alternative reactions, a number of these may be listed in the reaction field and they will be numbered (1), (2), etc. The systematic name will be based on the first of these listed reactions. A new system has just been introduced for consecutive reactions. For these, the overall reaction catalysed will be listed first and then the individual steps that go to form the overall reaction will be listed using the numbering system (1a), (1b) etc. to indicate that they are part of the same overall reaction.
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