jeannot
Posts: 1201
Joined: Jan. 2006
|
Shi,
Cyt C transfers electrons from complex n° 3 to complex n° 4 in the microchondrium internal membrane, IIRC. That's its function.
So cyt c co-evolves with these two protein complexes (at least) and these complexes also co-evlove with other proteins.
I don't see the reason why there should be a minimal level of identity for homologous cytochromes C just because ATP is produced at the end of the reaction chain.
EDIT: thank you Mr Cox, that was a better answer than I could ever give in English (or even in French after all  ).
EDIT 2: Shi, phylogenetic inferences are not based on sequence identities anymore (phenetics). We identify precisely all the mutations that occured in each lineage, regardless of the distance between sequences (cladistics).
|
