![]() ![]() Results in B. subtilis suggest that also ResC can bind haem. ResB is shown to bind protohaem IX and haem is found covalently bound to residue Cys-138. We have analysed these two B. subtilis proteins produced in E. coli and in the native organism. ![]() ResB and ResC are poorly understood polytopic membrane proteins required for cytochrome c synthesis. System II is found in Bacillus subtilis and comprises four proteins: CcdA, ResA, ResB and ResC. System I present in Escherichia coli has eight to nine different Ccm proteins. Two distinctly different systems for cytochrome c maturation are found in bacteria. Cytochromes of the c-type function on the outer side of the cytoplasmic membrane in bacteria where they also are assembled from apo-cytochrome polypeptide and haem. ![]()
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