Everything about Chlorosome totally explained
A
Chlorosome is a photosynthetic
antenna complex found in
green sulfur bacteria (GSB) and some green filamentous anoxygenic phototrophs (FAP) (
Chloroflexaceae,
Oscillochloridaceae). They differ from other antenna complexes by their large size and lack of
protein matrix supporting the photosynthetic pigments. Chlorosomes are ellipsoidal bodies, in GSB their length varies from 100 to 200 nm, width of 50-100 nm and height of 15 - 30 nm, in FAP the chlorosomes are somewhat smaller.
Inside the bacteria, GSB chlorosomes are thought to be attached to the
reaction centers in the
cell membrane via
FMO-proteins and a chlorosome baseplate composed of csmA proteins. Chlorosomes from FAP lack the FMO complex. The composition of the chlorosomes is mostly
bacteriochlorophyll with small amounts of
carotenoids and
quinones surrounded by a
galactolipid monolayer with ten different proteins attached to it.
Current models of the structure of bacterichlorophyll and carotenoids (the main constituents) inside the chlorosomes put them in a lamellar organization, where the long
farnesol tails of the bacteriochlorophyll intermix with carotenoids and each other, forming a structure resembling a lipid multilayer .
List of bacterial species containing chlorosomes
Further Information
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