Synthesis of C8-Vinyl Chlorophylls d and f Impairs Far-Red Light Photoacclimation and Growth Under Far-Red Light.

ABSTRACT: The inducible biosynthesis of chlorophylls d and f enables a subset of specialised cyanobacteria to perform oxygenic photosynthesis under far-red light-in the absence of visible wavelengths-via a process termed far-red light photoacclimation. These pigments, like the more common chlorophylls a and b, typically carry an ethyl substituent at the C8 position of the macrocycle, formed by reduction of a vinyl group by an 8-vinyl reductase enzyme. Here, we disrupted the gene encoding BciB, an 8-vinyl reductase found in the majority of cyanobacteria, in Chroococcidiopsis thermalis PCC 7203, a model organism for studying far-red light photoacclimation. Disruption of bciB results in the synthesis of 8-vinyl chlorophyll a when cells are grown in white light; upon switching to far-red light, 8-vinyl

SUBMITTER: Chaudhary AK 

PROVIDER: S-EPMC12629889 | biostudies-literature | 2025 Nov-Dec

REPOSITORIES: biostudies-literature