bacteriochlorophyll

This is the first unique step in the synthesis of bacteriochlorophyll.

These organisms use bacteriochlorophyll and some chlorophyll a but do not produce oxygen.

Recently, another study has determined the organization of the bacteriochlorophyll molecules in green sulfur bacteria.

Groups that contain bacteriochlorophyll conduct photosynthesis, but do not produce oxygen.

Used primarily for photosynthesis, they contain bacteriochlorophyll pigments and carotenoids.

The electron transport chain of green sulfur bacteria uses the reaction centre bacteriochlorophyll pair, P840.

Several other groups of bacteria use the bacteriochlorophyll pigments (similar to the chlorophylls) for photosynthesis.

The lake contains a population of green sulfur bacteria that conducts photosynthesis with bacteriochlorophyll e.

Different groups contain different types of bacteriochlorophyll:

They are pigmented with bacteriochlorophyll a or b, together with various carotenoids, which give them colours ranging between purple, red, brown, and orange.

Due to the presence of chlorophyll a, as opposed to bacteriochlorophyll, photosystem II absorbs light at a shorter wavelength.

The electron transport chain of purple non-sulfur bacteria begins when the reaction centre bacteriochlorophyll pair, P870, becomes excited from the absorption of light.

One remarkable aspect of these novel bacteria is that they, unlike other similar bacteria, are unable to utilize BChl (bacteriochlorophyll) for anaerobic growth.

Photoheterotrophs generate ATP using light in one of two ways: they use a bacteriochlorophyll based reaction center or they use a bacteriorhodopsin.

The porphyrin ring of bacteriochlorophyll is saturated, and lacking alternation of double and single bonds causing variation in absorption of light.

It reacts via tranesterification or hydrolysis of a carboxylic ester in which its natural substrates are 13-OH-chlorophyll a, bacteriochlorophyll and chlorophyll a.

On photoactivation there is an electron-transfer chain from the primary donor - the bacteriochlorophyll molecules - to the primary quinone, and then to the secondary quinone.

The primary pigment involved is bacteriochlorophyll g, which is unique to the group and has a unique absorption spectrum; this gives the heliobacteria their own environmental niche.

Although the amount of bacteriochlorophyll in these photoheterotrophs is lower than in other photosynthetic bacteria, they are capable of fixing CO2 during photosynthesis, and light enhances their growth.

The first strain descriptions appeared in 1991 which described members Roseobacter litoralis and Roseobacter denitrificans, both pink-pigmented bacteriochlorophyll a-producing strains isolated from marine algae.

Photosynthesis is achieved using bacteriochlorophyll (BChl) c, d, or e, in addition to BChl a and chlorophyll a, in chlorosomes attached to the membrane.

In the transmembrane region of both chains there is a conserved histidine which is most probably involved in the binding of the magnesium atom of a bacteriochlorophyll group.

CobT, too, has been found to be remotely related to the third subunit of Mg-chelatase, BchD (involved in bacteriochlorophyll synthesis, e.g., in Rhodobacter capsulatus).

He also solved early structures of the thermophilic bacterial enzyme thermolysin, the Helix-turn-helix DNA-binding transcription factor lambda Cro repressor, and the light-antenna bacteriochlorophyll protein.

If the reverse complement is transcribed it would potentially in 5' UTRs of genes encoding bacteriochlorophyll A, and would be close to the start codon of those genes.