Journal of Lipid Research, Vol 22, 1126-1130, Copyright © 1981 by Lipid Research, Inc.
Cellular and thylakoid-membrane phospholipids of Chlamydomonas reinhardtii 137+
DR Janero and R Barrnett
The phospholipids of phototrophically-cultured Chlamydomonas reinhardtii
137+ have been quantitated at the cellular and thylakoid membrane levels.
The alga contains three major phospholipids, phosphatidylglycerol (PG),
phosphatidylethanolamine (PE), and phosphatidylcholine (PC), which together
constitute about 14% of the cellular polar lipid complement. PG is the only
phospholipid in an analytical fraction of thylakoid membrane isolated from
the alga, and represents about 9% of the membrane's total polar lipid.
Slightly more than half the cellular PG is localized in the photosynthetic
lamellae. Hexadecanoic and octadecanoic fatty acids make up over 70% of the
acyl groups esterified to these phospholipids, PG being the most highly
unsaturated of the three. Differences in fatty acid profile between
cellular and thylakoid PG, as well as the presence of PE and PC in the alga
but not in its thylakoid, are indicative of a strict biogenetic regulation
of the specific types and species of phospholipid associated with the
photosynthetic membrane.
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