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GrainGenes Reference Report: PNA-93-3169

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Reference	PNA-93-3169
Title	Thiocalsin: a thioredoxin-linked, substrate-specific protease dependent on calcium
Journal	Proceedings of the National Academy of Sciences, USA
Year	1996
Volume	93
Pages	3169-3175
Author	Besse I Wong J Kobrehel K Buchanan B
Abstract	We describe a protease, named 'thiocalsin,' that is activated by calcium but only after reductive activation by thioredoxin, a small protein with a redox-active disulfide group that functions widely in regulation Thiocalsin appeared to be a 14-kDa serine protease that functions independently of calmodulin The enzyme, purified from germinating wheat grain, specifically cleaved the major indigenous storage proteins, gliadins and glutenins, after they too had been reduced, preferentially by thioredoxin The disulfide groups of the enzyme, as well as its protein substrates, were reduced by thioredoxin via NADPH and the associated enzyme, NADP-thioredoxin reductase The results broaden the roles of thioredoxin and calcium and suggest a joint function in activating thiocalsin, thereby providing amino acids for germination and seedling development.
Keyword	[ Hide all but 1 of 16 ] calcium-ions enzyme activity enzyme-inhibitors gliadin glutenin nadp-thioredoxin-reductase nadph oxidoreductases plant proteins proteolysis reduction regulation seed seed germination serine-proteinases triticum durum

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