ibclogo XVI International Botanical Congess

Abstract Number: 2497
Session = 4.13.4


CIRCADIAN REGULATORS FROM PHYLOGENETICALLY DIVERSE ALGAE ARE CONSERVED BUT INVOLVED IN DIFFERENT PHENOTYPIC PROCESSES


M. Mittag, H. Waltenberger and C. Schneid - Menzinger Str. 67, D-80638 München


The circadian clock regulates many processes in algae. The daily light-dark change synchronizes this clock to a period of 24 h. As a model, we have investigated the circadian expression of the luciferin-binding protein (LBP) from Gonyaulax polyedra, which is involved in bioluminescence peaking during the night-phase. Temporal LBP expression is regulated at the translational level involving a trans-acting factor (CCTR), which binds in a circadian manner to lbp mRNA (1). Recently, we have identified a CCTR analogue (Chlamy 1) in the green alga Chlamydomonas reinhardtii. Although Chlamy 1 has the same target sequence as the CCTR embracing 7 UG-repeats, it regulates temporal expression of several distinct proteins in Chlamydomonas being non-related to LBP. (1)Mittag and Hastings(1996)Phys. Plant.

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