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Article Addendum
Sensing of Elevating CO2 in a Marine Diatom: Molecular Mechanisms and Implications
Yusuke Matsuda, Hisashi Harada, Kensuke Nakajima and Brian Colman
volume 2 | issue 2
march/april 2007Pages: 109 - 111
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One of the critical parts of the CO2 perception mechanisms in algae has now been identified in a marine diatom, an important finding since diatoms are the major primary producer in the ocean. Increasing CO2 might probably be sensed directly by the cAMP forming enzyme, adenylyl cyclase, and cytosolic cAMP represses expression of CCM components in marine diatoms. Upstream sequences of CO2-responsive genes, ptca1 and 2, for carbonic anhydrases (CA) in the marine diatom Phaeodactylum tricornutum, were recently isolated and characterized. Promoters for both ptca1 and 2 possess at least 5 CREs respectively at -10 to -330 and at -330 to -630 relative to each transcription-start site. Our recent experiments clearly showed that one of CREs, located at -70 to -63 of the ptca1 promoter, exhibited a primary role in repressing the ptca1 promoter under high CO2 or in the dark. Truncations of CREs in the ptca2 promoter also resulted in derepressions of the ptca2 gene in high CO2. This addendum will discuss the implication of acquiring repression systems for the CCM and the possible impact of the repression of the CCM following a direct perception of elevated [CO2] in the marine environment.
Authors
Yusuke Matsuda
Kwansei-Gakuin University; Hyogo Japan
Hisashi Harada
Kwansei-Gakuin University; Hyogo Japan
Kensuke Nakajima
Kwansei-Gakuin University; Hyogo Japan
Brian Colman
York University, Toronto, Canada
We now provide open access to journal articles published online for one year or more. This article may be downloaded at the following link:
Download PDF If the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.