Journal
PHOTOSYNTHESIS RESEARCH
Volume 86, Issue 3, Pages 475-489Publisher
SPRINGER
DOI: 10.1007/s11120-005-4048-9
Keywords
arylsulfatase; cross-talk; nutrient deprivation; nutrient sensing; protein kinase; random insertional mutagenesis; regulation of transport; SAC1; SAC3; signal transduction; sulfate
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During sulfur deprivation, the photosynthetic green alga Chlamydomonas reinhardtii develops a high-affinity sulfate uptake system and increases the expression of genes encoding proteins involved in sulfur assimilation. Although two regulatory elements, SAC1 and SAC3, have been shown to be required for normal acclimation of C. reinhardtii to sulfur deprivation, a number of other regulatory elements appear to also be involved. The molecular mechanisms by which these regulatory elements function are largely unknown. This manuscript presents our current knowledge of sulfur deprivation responses and the regulation of these responses in C. reinhardtii. In addition, we present preliminary results of a sub-saturation screen for novel sulfur acclimation mutants of C. reinhardtii. A speculative model, incorporating the activities of established regulatory elements with putative novel components of the signal transduction pathway(s) is discussed.
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