in rhodobacter sphaeroides , cytochrome c2 ( cyt c2 ) is a periplasmic redox protein required for photosynthetic electron transfer . cyt c2-deficient mutants created by replacing the gene encoding the apoprotein for cyt c2 ( cyca ) with a kanamycin resistance cartridge are photosynthetically incompetent .
C0033684
protein
C0003601
apoprotein