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Cyanobionts play a variety of roles in their symbiotic relationships with the host organism. [2] [4] [5] They function primarily as nitrogen- and carbon-fixers.However, they can also be involved in metabolite exchange, as well as in provision of UV protection to their symbiotic partners, since some can produce nitrogen-containing compounds with sunscreen-like properties, such as scytonemin and ...
The crystal structure of B-phycoerythrin from red algae Porphyridium cruentum (PDB ID: 3V57 [5] [6] [4]). The asymmetric unit (α β) 2 on the left and assumed biological molecule (α β) 3. It contains phycoerythrobilin, N-methyl asparagine and SO 4 2−. C-Phycocyanin (CPC) 232 620 nm / 642 nm 0,81 1.54 10 6
Prochlorococcus is a genus of very small (0.6 μm) marine cyanobacteria with an unusual pigmentation (chlorophyll a2 and b2).These bacteria belong to the photosynthetic picoplankton and are probably the most abundant photosynthetic organism on Earth.
The oldest undisputed evidence of cyanobacteria is dated to be 2.1 Ga ago, but there is some evidence for them as far back as 2.7 Ga ago. [31] Cyanobacteria might have also emerged 3.5 Ga ago. [177] Oxygen concentrations in the atmosphere remained around or below 0.001% of today's level until 2.4 Ga ago (the Great Oxygenation Event). [178]
Phycoerythrin (PE) is a red protein-pigment complex from the light-harvesting phycobiliprotein family, present in cyanobacteria, [1] red algae [2] and cryptophytes, [3] accessory to the main chlorophyll pigments responsible for photosynthesis.The red pigment is due to the prosthetic group, phycoerythrobilin, which gives phycoerythrin its red color.
Phycobilins (from Greek: φύκος (phykos) meaning "alga", and from Latin: bilis meaning "bile") are light-capturing bilins found in cyanobacteria and in the chloroplasts of red algae, glaucophytes and some cryptomonads (though not in green algae and plants). [1] Most of their molecules consist of a chromophore which makes them coloured. [1]
[1] [2] Although cyanobacteria metabolize photoautotrophically like eukaryotic plants, they have prokaryotic cell structure. Cyanophages can be found in both freshwater and marine environments. [ 3 ] Marine and freshwater cyanophages have icosahedral heads, which contain double-stranded DNA, attached to a tail by connector proteins. [ 4 ]
The microcystin-producing Microcystis is a genus of freshwater cyanobacteria and thrives in warm water conditions, especially in stagnant waters. [7] The EPA predicted in 2013 that climate change and changing environmental conditions may lead to harmful algae growth and may negatively impact human health. [ 20 ]