Plant Molecular Biology

, Volume 31, Issue 2, pp 205–211

Cloning of Brassica napus CTP:phosphocholine cytidylyltransferase cDNAs by complementation in a yeast cct mutant

  • Ikuo Nishida
  • Russell Swinhoe
  • Antoni R. Slabas
  • Norio Murata
Research Article


CTP: phosphocholine cytidylyltransferase is a rate-limiting enzyme in biosynthesis of phosphatidylcholine in plant cells. We have isolated four cDNAs for the cytidylyltransferase from a root cDNA library of Brassica napus by complementation in a yeast cct mutant. The deduced amino-acid sequences of the B. napus enzymes resembled rat and yeast enzymes in the central domain. Although all cytidylyltransferases ever cloned from B. napus and other organisms were predicted to be structurally hydrophilic, the yeast cct mutant transformed with one of the B. napus cDNA clones restored the cytidylyltransferase activity in the microsomal fraction as well as in the soluble fraction. These results are consistent with a recent view that yeast cells contained a machinery for targeting the yeast cytidylyltransferase to membranes, and may indicate that the B. napus enzyme was compatible with the machinery.

Key words

Brassica napus CDP-choline cytidylyltransferase freezing stress phosphatidylcholine yeast mutant complementation 


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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Ikuo Nishida
    • 1
  • Russell Swinhoe
    • 3
  • Antoni R. Slabas
    • 3
  • Norio Murata
    • 1
  1. 1.National Institute for Basic BiologyOkazakiJapan
  2. 2.Department of Biological Sciences, Graduate School of ScienceUniversity of TokyoTokyoJapan
  3. 3.Department of Biological SciencesUniversity of DurhamDurhamUK

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