PLANT PHYSIOLOGY , Vol 113, Issue 3 997-1002, Copyright © 1997 by American Society of Plant Biologists
Complementary DNAs Encoding Eukaryotic-Type Cytidine-5[prime]-Diphosphate-Diacylglycerol Synthases of Two Plant Species
J. Kopka, M. Ludewig and B. Muller-Rober
Institut fur Genbiologische Forschung Berlin, Ihnestrasse 63, D-14195 Berlin, Germany (J.K., M.L.)
Cytidine diphosphate (CDP)-diacylglycerol synthase (cytidine
triphosphate:phosphatidate cytidyltransferase, EC 2.7.7.41) catalyzes the
formation of CDP-diacylglycerol, which is the precursor of
phosphatidylinositol, phosphatidylglycerol, and cardiolipin. We report the
first cloning, to our knowledge, of two plant cDNAs, StCDS1 and AtCDS1,
coding for CDP-diacylglycerol synthases from potato (Solanum tuberosum) and
Arabidopsis thaliana, respectively. The two proteins belong to the
eukaryotic type of CDP-diacylglycerol synthases and contain eight predicted
transmembrane-spanning domains. We analyzed gene expression in shoot and
root tissues of potato plants and demonstrated enzyme activity by
expression of N-terminally truncated, recombinant StCDS1 in Escherichia
coli.