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The mechaDism of this process, i. e., the hydrogenlyase reaction, has been the subject of considerable research and speculation over several decades. One fundamental aspect of the reaction which has received particular attention is the question of whether one or more enzymes are required for the conversion. It seems reasonable that definitive and unambiguous evidence relating to this point will necessaily require detailed analysis of the system in the cell-free state. A number of properties of the cell-free system (Gest, 1952; Barkulis and Gest, 1953) and the available results of growing and resting cell experiments were recently reviewed in detail by one of the present authors (Gest, 1954), who concluded that formate is decomposed to H2 and C02 by a multienzyme system containing "formic dehydrogenase" and hydrogenase. The concept that the hydrogenlyase reaction requires a series of catalysts which may be represented as:

A STUDY OF THE HYDROGENLYASE REACTION WITH SYSTEMS DERIVED FROM NORMAL AND ANAEROGENIC COLI-AEROGENES BACTERIA