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- W2108148575 abstract "Cph2 from the cyanobacterium Synechocystis sp. PCC 6803 is a hybrid photoreceptor that comprises an N-terminal module for red/far-red light reception and a C-terminal module switching between a blue- and a green-receptive state. This unusual photoreceptor exerts complex, light quality-dependent control of the motility of Synechocystis sp. PCC 6803 cells by inhibiting phototaxis towards blue light. Cph2 perceives blue light by its third GAF domain that bears all characteristics of a cyanobacteriochrome (CBCR) including photoconversion between green- and blue-absorbing states as well as formation of a bilin species simultaneously tethered to two cysteines, C994 and C1022. Upon blue light illumination the CBCR domain activates the subsequent C-terminal GGDEF domain, which catalyses formation of the second messenger c-di-GMP. Accordingly, expression of the CBCR-GGDEF module in Δcph2 mutant cells restores the blue light-dependent inhibition of motility. Additional expression of the N-terminal Cph2 fragment harbouring a red/far-red interconverting phytochrome fused to a c-di-GMP degrading EAL domain restores the complex behaviour of the intact Cph2 photosensor. c-di-GMP was shown to regulate flagellar and pili-based motility in several bacteria. Here we provide the first evidence that this universal bacterial second messenger is directly involved in the light-dependent regulation of cyanobacterial phototaxis." @default.
- W2108148575 created "2016-06-24" @default.
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- W2108148575 date "2012-06-12" @default.
- W2108148575 modified "2023-10-16" @default.
- W2108148575 title "Light-induced alteration of c-di-GMP level controls motility of Synechocystis sp. PCC 6803" @default.
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- W2108148575 doi "https://doi.org/10.1111/j.1365-2958.2012.08106.x" @default.
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