... for the< /b> yeast cytochrome < /b> b G167E mutant, suggest that interfacial protein< /b> protein < /b> interactions between < /b> the < /b> hinge region of < /b> ISP and < /b> the < /b> extramembranous cd2 helix of < /b> cytochrome < /b> b areimportant ... A. S., Valkova-Valchanova, M., Tokito, M.K., Zhang, Z.,Berry, E .A. & Daldal, F. (1998) Interactions between < /b> the< /b> cytochrome < /b> b, cytochrome < /b> c1, and < /b> Fe-S protein < /b> subunits at the< /b> ubihydroquinone ... reduced the < /b> sterichindrance caused by G167E. Taken together, these obser-vations suggest that the < /b> protein< /b> protein < /b> interaction < /b> between < /b> the < /b> n-sulfur protein < /b> hinge region and < /b> the < /b> cytochrome < /b> b extramembranous...