biostudies-literatureUnknown109(49)Shukla AThe marine cyanobacterium Synechococcus is the second most abundant phytoplanktonic organism in the world's oceans. The ubiquity of this genus is in large part due to its use of a diverse set of photosynthetic light-harvesting pigments called phycobiliproteins, which allow it to efficiently exploit a wide range of light colors. Here we uncover a pivotal molecular mechanism underpinning a widespread response among marine Synechococcus cells known as "type IV chromatic acclimation" (CA4). During this process, the pigmentation of the two main phycobiliproteins of this organism, phycoerythrins I and II, is reversibly modified to match changes in the ambient light color so as to maximize photon capture for photosynthesis. CA4 involves the replacement of three molecules of the green light-absorbProceedings of the National Academy of Sciences of the United States of America20136-41https://www.ebi.ac.uk/biostudies/studies/S-EPMC3523879biostudies-literaturePhycoerythrin-specific bilin lyase-isomerase controls blue-green chromatic acclimation in marine Synechococcus.PMC3523879Schluchter WMKarty JAGarczarek LHammad LAPartensky FKehoe DMShukla ABlot NBiswas AGutu AfalsePhycoerythrin-specific bilin lyase-isomerase controls blue-green chromatic acclimation in marine Synechococcus.The marine cyanobacterium Synechococcus is the second most abundant phytoplanktonic organism in the world's oceans. The ubiquity of this genus is in large part due to its use of a diverse set of photosynthetic light-harvesting pigments called phycobiliproteins, which allow it to efficiently exploit a wide range of light colors. Here we uncover a pivotal molecular mechanism underpinning a widespread response among marine Synechococcus cells known as "type IV chromatic acclimation" (CA4). During this process, the pigmentation of the two main phycobiliproteins of this organism, phycoerythrins I and II, is reversibly modified to match changes in the ambient light color so as to maximize photon capture for photosynthesis. CA4 involves the replacement of three molecules of the green light-absorb2012-01-01T00:00:00Z2012 Dec2026-05-05T17:26:23.697Z2026-04-07T21:55:08.177ZS-EPMC35238792316190910.1073/pnas.1211777109