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The Calvin cycle enzyme sedoheptulose-1,7-bisphosphatase is encoded by a light-regulated gene in Chlamydomonas reinhardtii

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Abstract

We have studied the light-dependent expression of the Chlamydomonas reinhardtii csbp gene encoding sedoheptulose-1,7-bisphosphatase (SBPase), an enzyme of the pentose-phosphate pathway. Expression studies using light/dark-synchronized cultures revealed that csbp mRNA abundance increases significantly during illumination. We have used a 1.4 kb region upstream of the csbp gene in transcriptional fusions to the homologous arylsulfatase-encoding reporter gene (ars). In transformants carrying the chimeric csbp/ars reporter gene, arylsulfatase activity is detected in the absence of sulfate, a condition under which the endogenous ars gene is repressed. Moreover, ars mRNA accumulation is dramatically stimulated by light, indicating that 1.4 kb of the csbp 5′-untranslated region are sufficient to confer light-dependent expression on the ars reporter gene.

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  1. Lehrstuhl für Allgemeine Botanik, Ruhr Universität Bochum, 44780, Bochum, Germany

    Daniela Hahn, Carmen Kaltenbach & Ulrich Kück

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  1. Daniela Hahn
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  2. Carmen Kaltenbach
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  3. Ulrich Kück
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Hahn, D., Kaltenbach, C. & Kück, U. The Calvin cycle enzyme sedoheptulose-1,7-bisphosphatase is encoded by a light-regulated gene in Chlamydomonas reinhardtii . Plant Mol Biol 36, 929–934 (1998). https://doi.org/10.1023/A:1005911022601

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