Degradation of storage proteins in germinating seeds |
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| Affiliation: | 1. iThemba LABS, National Research Foundation, South Africa;2. Department of Food Science and Institute for Food, Nutrition and Well-being, University of Pretoria, South Africa;3. Faculty of Health and Wellness Sciences, CPUT, Bellville, South Africa;1. Biostabilization Laboratory, Mechanical Engineering Department, College of Science and Engineering, University of Minnesota, Minneapolis, MN 55455, United States;2. Heat and Mass Transfer Laboratory, Mechanical Engineering Department, Kyushu University, Fukuoka, Japan;1. Instituto de Recursos Biológicos, CIRN, Instituto Nacional de Tecnología Agropecuaria (INTA), De Los Reseros y N. Repetto, 1686 Hurlingham, Buenos Aires, Argentina;2. International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico;3. Department of Plant Sciences, University of California, Davis, CA 95616-8780, USA;4. Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA |
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| Abstract: | The criteria for the participation of proteases in the mobilization of storage proteins during seed germination are formulated. The proteases that satisfy these criteria, namely the acid cysteine endopeptidases, serine carboxypeptidases and neutral aminopeptidases, are reviewed. The possibility of other seed proteases participating in storage protein degradation is discussed. The course of 11S and 7S storage protein degradation through the action of endogenous and exogenous proteases is described. The 11S and 7S proteins are modified during the early stages of proteolysis and the effects of these modifications on the regulation of breakdown are examined. A scheme for 11S protein degradation in germinating seeds is presented. |
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