1. Sepharose 6B gel-filtration analysis of soluble adenylate cyclase from bovine corpus luteum is described. Both zonal and frontal techniques of analysis were used. 2. Under conditions of zonal analysis recoveries of activity were low. It was concluded that dissociation of two or more components of the adenylate cyclase complex was occurring on the column and that the maintenance of the complex was essential for the high-activity state of the catalytic unit. Two peaks of adenylate cyclase activity, of approximate mol. wts. 45,000 and 160,000 were detected. 3. The theory of frontal analysis (or steady-state gel filtration), applied to the study of the interacting components of the adenylate cyclase complex is discussed, and activity profiles are predicted. Activity profiles obtained experimentally be frontal analysis compared well with the theoretically predicted profile and provide evidence that dissociation of a high-activity complex, with concomitant loss of activity, does occur. Recoveries of activity under conditions of frontal analysis were higher than with zonal analysis. 4. The effects of concentration and removal of detergent on the activity of the soluble enzyme are discussed.

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