Insights into the acclimation of Chlamydomonas reinhardtii to sulfur deprivation.
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.
Pollock
Steve V
SV
Department of Plant Biology, The Carnegie Institution, 260 Panama Street, Stanford, CA 94305, USA. pollock@lsu.edu
Pootakham
Wirulda
W
Shibagaki
Nakako
N
Moseley
Jeffrey L
JL
Grossman
Arthur R
AR
D000064:Acclimatization / Q000502:physiology*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001692:Biological Transport; D016825:Chlamydomonas reinhardtii / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology*; D015800:Protozoan Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D013455:Sulfur / Q000494:pharmacology*
D015800:Protozoan Proteins; D013455:Sulfur