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Adenylyl Cyclase Activity of Cya1 from the Cyanobacterium Synechocystis sp. Strain PCC 6803 Is Inhibited by Bicarbonate

Laboratory for Photo-Biology, RIKEN Photodynamics Research Center, The Institute of Physical and Chemical Research, 519-1399 Aramaki, Aoba, Sendai 980-0845, Japan

Received 8 March 2005/ Accepted 11 April 2005

Bicarbonate stimulates the activities of several class III adenylyl cyclases studied to date. However, we show here that bicarbonate decreased V_max and substrate affinity in Cya1, a major adenylyl cyclase in the cyanobacterium Synechocystis sp. strain PCC 6803. This indicates that manifestation of the bicarbonate responsiveness is specifically modulated in Cya1.

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