title: Extensive remodeling of a cyanobacterial photosynthetic apparatus in far-red light.
abstract: Cyanobacteria are unique among bacteria in performing oxygenic photosynthesis, often together with nitrogen fixation and, thus, are major primary producers in many ecosystems. The cyanobacterium, Leptolyngbya sp. strain JSC-1, exhibits an extensive photoacclimative response to growth in far-red light that includes the synthesis of chlorophylls d and f. During far-red acclimation, transcript levels increase more than twofold for ~900 genes and decrease by more than half for ~2000 genes. Core subunits of photosystem I, photosystem II, and phycobilisomes are replaced by proteins encoded in a 21-gene cluster that includes a knotless red/far-red phytochrome and two response regulators. This acclimative response enhances light harvesting for wavelengths complementary to the growth light (λ = 700 to 750 nanometers) and enhances oxygen evolution in far-red light.
authors.affiliation: Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: Fei
authors.initials: F
authors.lastname: Gan
authors.affiliation: Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: Shuyi
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Department of Molecular and Cellular Biology, University of California, Davis, CA 95616, USA.
authors.forename: Nathan C
authors.initials: NC
authors.lastname: Rockwell
authors.affiliation: Department of Molecular and Cellular Biology, University of California, Davis, CA 95616, USA.
authors.forename: Shelley S
authors.initials: SS
authors.lastname: Martin
authors.affiliation: Department of Molecular and Cellular Biology, University of California, Davis, CA 95616, USA.
authors.forename: J Clark
authors.initials: JC
authors.lastname: Lagarias
authors.affiliation: Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA. Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA. dab14@psu.edu.
authors.forename: Donald A
authors.initials: DA
authors.lastname: Bryant
mesh_terms: D000064:Acclimatization; D002734:Chlorophyll / Q000096:biosynthesis; D000458:Cyanobacteria / Q000201:enzymology / Q000502:physiology* / Q000528:radiation effects; D008027:Light; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000502:physiology; D010100:Oxygen / Q000502:physiology*; D010788:Photosynthesis / Q000235:genetics / Q000502:physiology* / Q000528:radiation effects; D045331:Photosystem I Protein Complex / Q000235:genetics / Q000502:physiology*; D045332:Photosystem II Protein Complex / Q000235:genetics / Q000502:physiology*; D045524:Phycobilisomes / Q000378:metabolism / Q000502:physiology*; D010802:Phylogeny; D010834:Phytochrome / Q000737:chemistry / Q000145:classification / Q000235:genetics; D017434:Protein Structure, Tertiary
chemical_list: D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D045524:Phycobilisomes; D010834:Phytochrome; D002734:Chlorophyll; C107509:chlorophyll d; D010100:Oxygen