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• W2137743886 startingPage "4048" @default.
• W2137743886 abstract "ABSTRACT Cyanobacteria are important players in the global carbon cycle, accounting for approximately 25% of global CO 2 fixation. Their CO 2 -concentrating mechanisms (CCMs) are thought to play a key role in cyanobacterial calcification, but the mechanisms are not completely understood. In Synechocystis sp. strain PCC 6803, a single Ca 2+ /H + exchanger (Slr1336) controls the Ca 2+ /H + exchange reaction. We knocked out the exchanger and investigated the effects on cyanobacterial calcification and CCMs. Inactivation of slr1336 significantly increased the calcification rate and decreased the zeta potential, indicating a relatively stronger Ca 2+ -binding ability. Some genes encoding CCM-related components showed increased expression levels, including the cmpA gene, which encodes the Ca 2+ -dependent HCO 3 − transporter BCT1. The transcript level of cmpA in the mutant was 30 times that in wild type. A Western blot analysis further confirmed that protein levels of CmpA were higher in the mutant than the wild type. Measurements of inorganic carbon fluxes and O 2 evolution proved that both the net HCO 3 − uptake rate and the BCT1 transporter supported photosynthetic rate in the slr1336 mutant were significantly higher than in the wild type. This would cause the mutant cells to liberate more OH − ions out of the cell and stimulate CaCO 3 precipitation in the microenvironment. We conclude that the mutation of the Ca 2+ /H + exchanger in Synechocystis promoted the cyanobacterial calcification process by upregulating CCMs, especially the BCT1 HCO 3 − transporter. These results shed new light on the mechanism by which CCM-facilitated photosynthesis promotes cyanobacterial calcification." @default.
• W2137743886 created "2016-06-24" @default.
• W2137743886 creator A5013791641 @default.
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• W2137743886 date "2013-07-01" @default.
• W2137743886 modified "2023-09-30" @default.
• W2137743886 title "Inactivation of Ca ²⁺ /H ⁺ Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO ₂ -Concentrating Mechanisms" @default.
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• W2137743886 doi "https://doi.org/10.1128/aem.00681-13" @default.
• W2137743886 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3697565" @default.
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• W2137743886 hasPublicationYear "2013" @default.
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