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The families of papain- and legumain-like cysteine proteinases from embryonic axes and cotyledons of Vicia seeds: developmental patterns, intracellular localization and functions in globulin proteolysis

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Abstract

Families of papain- and legumain-like cysteine proteinases (CPR) were found in Vicia seeds. cDNAs and antibodies were used to follow organ specificity and the developmental course of CPR-specific mRNAs and polypeptides. Four papain-like cysteine proteinases (CPR1, CPR2, proteinase A and CPR4) from vetch seeds (Vicia sativa L.) were analysed. CPR2 and its mRNA were already found in dry embryonic axes. CPR1 was only detected there during early germination. Both CPR1 and CPR2 strongly increased later during germination. In cotyledons, both CPR1 and CPR2 were only observed one to two days later than in the axis. Proteinase A was not found in axes. In cotyledons it could only be detected several days after seeds had germinated. CPR4 mRNA and polypeptide were already present in embryonic axes and cotyledons during seed maturation and decreased in both organs during germination. Purified CPR1, CPR2 and proteinase A exhibited partially different patterns of globulin degradation products in vitro. Although the cDNA-deduced amino acid sequence of the precursor of proteinase A has an N-terminal signal peptide, the enzyme was not found in vacuoles whereas the other papain-like CPRs showed vacuolar localization. Four different legumain-like cysteine proteinases (VsPB2, proteinase B, VnPB1 and VnPB2) of Vicia species were analysed. Proteinase B and VnPB1 mRNAs were detected in cotyledons and seedling organs after seeds had germinated. Proteinase B degraded globulins isolated from mature vetch seeds in vitro. VsPB2 and proteinase B are localized to protein bodies of maturing seeds and seedlings, respectively, of V. sativa. Like VsPB2 from V. sativa, also VnPB2 of V. narbonensis corresponds to vacuolar processing enzymes (βVPE). Based on these results different functions in molecular maturation and mobilization of storage proteins could be attributed to the various members of the CPR families.

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Authors and Affiliations

  1. Institut für Pflanzengenetik und Kulturpflanzenforschung, Corrensstrasse 3, 06466, Gatersleben, Germany

    J. Fischer, C. Becker, S. Hillmer, C. Horstmann, B. Neubohn, A. Schlereth, V. Senyuk, A. Shutov & K. Müntz

  2. Albrecht-von-Haller Institute of Plant Sciences, Department of Structural Cell Physiology, University of Göttingen, Untere Karspüle 2, 37073, Göttingen, Germany

    S. Hillmer

  3. Laboratory of Protein Chemistry, State University of Moldova, Chisinau, Republic of Moldova

    V. Senyuk

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  1. J. Fischer
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Fischer, J., Becker, C., Hillmer, S. et al. The families of papain- and legumain-like cysteine proteinases from embryonic axes and cotyledons of Vicia seeds: developmental patterns, intracellular localization and functions in globulin proteolysis. Plant Mol Biol 43, 83–101 (2000). https://doi.org/10.1023/A:1006456615373

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