Abstract
The major storage protein of jackbean (Canavalia ensiformis) has been purified by a protocol involving ammonium-sulphate precipitation, gel filtration and ion-exchange chromatography. The protein was shown by partial amino-acid-sequence data to be homologous to vicilin, a major storage protein of pea (Pisum sativum), and is thus a member of the family of legume 7S proteins exemplified by pea vicilin. This protein is thus referred to as jack-bean vicilin rather than “canavalin” or “precanavalin” as previously used. Other properties of the jack-bean vicilin (e.g. subunit relative molecular mass (Mr) and structure, resistance to proteolysis) show similarity to phaseolin, the major 7S storage protein ofPhaseolus vulgaris. Jack-bean vicilin contained no detectable α-mannosidase activity, either as isolated from mature or germinating seeds, or after proteolytic treatment. α-Mannosidase was also purified from jack beans, and was shown to have a subunit Mr of approx. 120,000; it was separated completely from jack-bean vicilin by a similar protocol to that used for purifying the latter. The α-mannosidase was proteolytically cleaved after seed germination, but did not give polypeptides of the same Mr as jackbean vicilin. It was concluded that α-mannosidase and jack-bean vicilin are not related proteins.
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Abbreviations
- DE:
-
diethylaminoethyl
- M:
-
relative molecular mass
- SDS:
-
sodium dodecyl sulphate
- PAGE:
-
polyacrylamide-gel electrophoresis
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Sammour, R.H., Gatehouse, J.A., Gilroy, J. et al. The homology of the major storage protein of jack bean (Canavalia ensiformis) to pea vicilin and its separation from α-mannosidase. Planta 161, 61–70 (1984). https://doi.org/10.1007/BF00951461
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DOI: https://doi.org/10.1007/BF00951461