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

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Abstract

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.

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Author notes

  1. Ikuo Nishida

    Present address: Department of Biological Sciences, Graduate School of Science, University of Tokyo, Bunkyoku, 113, Tokyo, Japan

Authors and Affiliations

  1. National Institute for Basic Biology, 444, Okazaki, Japan

    Ikuo Nishida & Norio Murata

  2. Department of Biological Sciences, University of Durham, DH1 3LE, Durham, UK

    Russell Swinhoe & Antoni R. Slabas

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  1. Ikuo Nishida
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  2. Russell Swinhoe
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  3. Antoni R. Slabas
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  4. Norio Murata
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Nishida, I., Swinhoe, R., Slabas, A.R. et al. Cloning of Brassica napus CTP:phosphocholine cytidylyltransferase cDNAs by complementation in a yeast cct mutant. Plant Mol Biol 31, 205–211 (1996). https://doi.org/10.1007/BF00021784

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  • DOI: https://doi.org/10.1007/BF00021784

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