Abstract：
:The synthesis of holocytochromes in plastids is a catalyzed process. Several proteins, including plastid CcsA, Ccs1, possibly CcdA and a thioredoxin, plus at least two additional Ccs factors, are required in sub-stoichiometric amounts for the conversion of apocytochromes f and c(6) to their respective holoforms. CcsA, proposed to be a heme delivery factor, and Ccs1, an apoprotein chaperone, are speculated to interact physically in vivo. The formation of holocytochrome b(6) is a multi-step pathway in which at least four, as yet unidentified, Ccb factors are required for association of the b(H) heme. The specific requirement of reduced heme for in vitro synthesis of a cytochrome b(559)-derived holo-beta(2) suggests that cytochrome b synthesis in PSII might also be catalyzed in vivo.
journal_name
Biochimiejournal_title
Biochimieauthors
Nakamoto SS,Hamel P,Merchant Sdoi
10.1016/s0300-9084(00)00605-2keywords:
subject
Has Abstractpub_date
2000-06-01 00:00:00pages
603-14issue
6-7eissn
0300-9084issn
1638-6183pii
S0300-9084(00)00605-2journal_volume
82pub_type
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