Catalytically-relevant electron transfer between two hemes bL in the hybrid cytochrome bc1-like complex containing a fusion of Rhodobacter sphaeroides and capsulatus cytochromes b

► We created a hybrid fusion of cytochromes b from R. capsulatus and R. sphaeroides. ► Hybrid fusion replaces two cytochrome b subunits in a dimer of cytochrome bc1. ► Complex with hybrid fusion confirms fast electron transfer between two hemes bL.