... bc1sub-complex, but the presence of only one of these two subunits does not substitutefor the other. After the addition of ISP, the binding of the last subunit (i.e. Qcr10p) finally occurs. These find-ings ... toosmall to explain the dimerization of the bc1complex atthis stage (i.e. just after the addition of ISP and Qcr10p). On the other hand, in the transition from the 500 kDaband to the 670 kDa band, ... alsounknown. Furthermore, as in the case of the biogene-sis of other multi-subunit complexes of the mitochon-drial respiratory chain, the assistance of specificchaperone proteins is also required. The...