ENZYME COMPLEXES 



sequence of aromatic amino acids, etc. The encouraging aspect 

 of the problem is, on the contrary, that even with all these 

 tendencies toward slower rates, the rate of interaction between 

 cytochromes, using the metallic model, may still be fast enough 

 to be consistent with the observed rates. Only relatively short 

 portions of the over-all system may be actually metal-mediated. 

 These conducting sequences may be inserted only in the vicinity 

 of or between iron-porphyrins and other prosthetic groups. 

 Their main purpose may well be to provide junction points 

 and plugs along the main line sequence for the multitude of 

 parallel and accessory paths. 



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273 



