Question

Compare and Contrast Purple Sulfur and Green Sulfur bacteria. You can use a chart.

How are carboxysomes formed?

Answer 1

Purple Sulfur bacteria

Green Sulfur bacteria

They are group of Proteobacteria, capable of photosynthesis. They are anaerobic or microaerophilic. They are found in stratified water environments including hot springs, stagnant water bodies, also including microbial mats. These purple sulfur bacteria do not use water as their reducing agent. They do not produce oxygen, during photosynthesis. They can use sulfur in the form of sulfide, or thiosulfate . Fe2+, or NO2− use as the electron donor in their photosynthetic pathways. The sulfur is oxidized to produce granules of elemental sulfur or sulfuric acid.

The green sulfur bacteria are anaerobic photoautotrophic bacteria. Green sulfur bacteria are nonmotile They capable of anoxygenic photosynthesis. They can use sulfide ions as electron donors.Photosynthetic electron donor: H2, H2S, S. Green sulfur bacteria have been found in depths of up to 145m in the Black Sea, with low light availability. Their major photosynthetic pigment: Bacteriochlorophylls a plus c, d or e

The Carboxysomes are bacterial organelles, they consists of polyhedral protein shells filled with the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) -the predominant enzyme in carbon fixation .

Carboxysomes formed by the assembly of a series of protein-protein interactions: the enzyme RuBisCO and the two isoforms known as the full length and short form , of the CcmM protein interact by means of the SSLDs. Then finally the CcaA the beta-carbonic anhydrase is brought into the carboxysome core.

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