Light intensity adaptation and phycobilisome composition of Microcystis aeruginosa

Journal Article · Sun Dec 01 00:00:00 EST 1985 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.79.4.983· OSTI ID:6831320

Raps, S; Kycia, J H; Ledbetter, M C; Siegelman, H W

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), Vol. 79:4
• Country of Publication: United States
• Language: English

Related Subjects

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