Exogenous methionine depresses level of mRNA for a soybean storage protein |
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Authors: | Gary L Creason Lorraine P Holowach John F Thompson James T Madison |
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Institution: | 1. Section of Plant Biology, Division of Biological Sciences, Cornell University, Ithaca, NY 14853 USA;2. U.S. Plant, Soil and Nutrition Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Ithaca, NY 14853 USA |
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Abstract: | translation experiments indicate that absence of the β-subunit of 7S storage protein in soybean ( L. Merr. cv. Provar) cotyledons cultured on methionine-supplemented medium is due to lack of functional mRNA for that polypeptide. Relative amounts of functional mRNA for the 7S α′- and α-subunits were unaffected by methionine in the cotyledon culture medium. Measurements of β-subunit accumulation in cotyledons transferred from basal medium to methionine-supplemented medium show that methionine inhibits continued accumulation of the β-subunit after synthesis of the β-subunit has begun, and that methionine does not promote degradation of existing β-subunit. |
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