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Proc Natl Acad Sci U S A. 1996 April 16; 93(8): 3169–3175. | PMCID: PMC39577 |
Thiocalsin: a thioredoxin-linked, substrate-specific protease dependent on calcium. I Besse, J H Wong, K Kobrehel, and B B Buchanan Department of Plant Biology, University of California, Berkeley 94720, USA. 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. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (1.5M), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References. Images in this article Click on the image to see a larger version. These references are in PubMed. This may not be the complete list of references from this article. - Holmgren A. Thioredoxin and glutaredoxin systems. J Biol Chem. 1989 Aug 25;264(24):13963–13966. [PubMed]
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