Properties of Cytochrome b^ 521 



AppetuUx 

 The mechanisms given here have the following steady-state rale equations 



/.(of. p. 516) E+S^ES (1) 



k„ 



ES + A-^E + P + AHg (2) 



(where A and AHo represent the oxidized and reduced forms of a two- 

 electron acceptor). 



k, + A-.3[A] -^^ '" k^ 



k,[S] 



Thus, only where A'2 <^A:3[A] does K„JVj. remain constant. 

 For a one-electron acceptor, the mechanism becomes: 



k, k,[S] 



In this case also, both K„, and V^ have no finite limit values. 



//. (cf. p. 516) 



(a) See below. 



k, 



(b) E -h S ^ ES 



k., 



ks 



ES -f A ^ ESA 



ESA -^ E -f P + HoA 



^_ ME] 



k^ + k. k^jk^ + k^) kr, 

 k^{K] "^ M'3[A][S] A'i[S] 



(1) 



(3) 

 (4) 

 (1) 



(5) 

 (6) 



