Chlorophyll c

Chlorophyll '''c1' is a common form of chlorophyll c. It differs from chlorophyll c''2 in its C8 group, having an ethyl group instead of vinyl group (C-C single bond instead of C=C double bond). Its absorption maxima are around 444, 577, 626 nm and 447, 579, 629 nm in diethyl ether and acetone respectively. ==Chlorophyll c2==

Chlorophyll '''c2' is the most common form of chlorophyll c''. Its absorption maxima are around 447, 580, 627 nm and 450, 581, 629 nm in diethyl ether and acetone respectively. ==Chlorophyll c3==

Chlorophyll '''c3' is a form of chlorophyll c found in microalga Emiliania huxleyi'', identified in 1989. Its absorption maxima are around 452, 585, 625 nm and 452, 585, 627 nm in diethyl ether and acetone respectively. == Biosynthesis ==

Chlorophyll c synthesis branches off early from the typical Chlorophyllide synthesis pathway, after divinylprotochlorophyllide (DV-PChlide) is formed. It has been established that DV-PChlide and MV-PChlide are processed directly by a 171 oxidase ('CHLC, chlorophyll c synthase') into Chl c2 and Chl c1, respectively. The 171 oxidtion was proposed to proceed by "hydroxylation of the 17-propionate reside at the 171-position and successive dehydration to the 17-acrylate residue." An 8-vinyl reductase (elaborating on the promiscuous behavior of ferredoxin-type 3,8-divinyl chlorophyllide reductase) could also convert Chl c2 into Chl c1. The two steps could be swapped for the same effect. == Structure ==