Abstract
Two forms of thioredoxin possessing the capacity for reactivating glutamine synthetase have been isolated from the cells of a green alga. Thioredoxins I and II are heat-stable proteins with molecular masses of 12 and 24 kDa, respectively. Analysis of the amino acid compositions of (I) and (II) have shown that they each contain two cysteine residues participating in the reduction of the oxidized form of glutamine synthetase.
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