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Updated: Nov 4, 2025

Spectrophotometric Determination of Phycobiliprotein Content in Cyanobacterium Synechocystis
Published on: September 11, 2018
Changes in ATP Sulfurylase Activity in Response to Altered Cyanobacteria Growth Conditions
Lucia Gastoldi1, Lewis M Ward2,3, Mayuko Nakagawa3
1Laboratory of Algal and Plant Physiology, Department of Life and Environmental Sciences (DISVA), Università Politecnica delle Marche (UNIVPM).
Abstract:
We investigated variations in cell growth and ATP Sulfurylase (ATPS) activity when two cyanobacterial strains-Synechocystis sp. PCC6803 and Synechococcus sp. WH7803-were grown in conventional media, and media with low ammonium, low sulfate and a high CO2/low O2 atmosphere. In both organisms, a transition and adaptation to the reconstructed environmental media resulted in a decrease in ATPS activity. This variation appears to be decoupled from growth rate, suggesting the enzyme is not rate-limiting in S assimilation and raising questions about the role of ATPS redox regulation in cell physiology and throughout Earth history.
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