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Light intensity adaptation and phycobilisome composition of Microcystis aeruginosa

Journal Article · · Plant Physiol.; (United States)
DOI:https://doi.org/10.1104/pp.79.4.983· OSTI ID:6831320
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Phycobilisomes isolated from Microcystis aeruginosa grown to midlog at high light (270 microeinsteins per square meter per second) or at low light intensities (40 microeinsteins per square meter per second) were found to be identical. Electron micrographs established that they have a triangular central core apparently consisting of three allophycocyanin trimers surrounded by six rods, each composed of two hexameric phycocyanin molecules. The apparent mass of a phycobilisome obtained by gel filtration is 2.96 x 10/sup 6/ daltons. The molar ratio of the phycobiliproteins per phycobilisome is 12 phycocyanin hexamers:9 allophycocyanin trimers. The electron microscopic observations combined with the phycobilisome apparent mass and the phycobiliprotein stoichiometry data indicate that M. aeruginosa phycobilisomes are composed of a triangular central core of three stacks of three allophycocyanin trimers and six rods each containing two phycocyanin hexamers. Adaptation of M. aeruginosa to high light intensity results in a decrease in the number of phycobilisomes per cell with no alteration in phycobilisome composition or structure.
Research Organization:
CUNY, New York, NY
OSTI ID:
6831320
Journal Information:
Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 79:4; ISSN PLPHA
Country of Publication:
United States
Language:
English

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Related Subjects

550500* -- Metabolism
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL ADAPTATION
CELL CONSTITUENTS
CHEMICAL COMPOSITION
COLLOIDS
CYANOBACTERIA
DATA
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FILTRATION
GELS
INFORMATION
MASS
MEMBRANE PROTEINS
MICROORGANISMS
MICROSCOPY
MOLECULAR STRUCTURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYCOBILIPROTEINS
PHYCOBILISOMES
PHYCOCYANIN
PIGMENTS
PROTEINS
RADIATIONS
SEPARATION PROCESSES
STOICHIOMETRY
THYLAKOID MEMBRANE PROTEINS
VISIBLE RADIATION