Expression of the plant sulphite reductase in cell suspension cultures from Catharanthus roseus L
J D Schwenn, A Kemena
Sulphur-heterotrophic growth exhibited a dual response to the expression of sulphate-assimilating enzymes. The level of ATP-sulphurylase (EC 126.96.36.199) appeared "repressed" while sulphite reductase (EC 188.8.131.52) and O-acetyl-L-serine sulphhydrylase (EC 184.108.40.206) were "derepressed" and coordinated in their occurrence. The capability of the cells to reduce adenylylphosphosulphate or 3'-phospho adenylylphosphosulphate to cysteine coincided with the activity of sulphite reductase. The expression of these reducing steps lacked correlation with the regulation of ATP-sulphurylase.
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