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Gloeobacter
''Gloeobacter'' is a genus of cyanobacteria. It is the sister group to all other cyanobacteria. ''Gloeobacter'' is unique among cyanobacteria in not having thylakoids, which are characteristic for all other cyanobacteria and chloroplasts. Instead, the light-harvesting complexes (also called phycobilisomes), that consist of different proteins, sit on the inside of the plasma membrane among the (cytoplasm). Subsequently, the proton gradient in ''Gloeobacter'' is created over the plasma membrane, where it forms over the thylakoid membrane in cyanobacteria and chloroplasts.〔
The whole genome of ''G. violaceus'' (strain PCC 7421) and of G. kilaueensis have been sequenced. Many genes for Photosystem I and II were found missing, likely related to the fact that photosynthesis in the bacterium does not take place in the thylakoid membrane like in other cyanobacteria, but in the plasma membrane.
== Description ==
''G. violaceus'' produces several pigments, including chlorophyll a, β-carotene, oscillol diglycoside, and echinenone. The purple coloration is due to the relatively low chlorophyll content. ''G. kilaueensis'' grows with a few other bacteria as a purple colored biofilm of approximately 0.5 mm thick. Cultivated colonies are dark purple, smooth, shiny and raised. ''G. kilaueensis'' is mostly unicellular, capsule-shaped, approximately 3.5×1.5 µm, and inbedded in mucus. They divide over the width of the cell. Cells color gramnegative, and lack vancomycin resistance. They are not motile and do not glide. Growth ceases in complete darkness, so ''Gloeobacter'' is very likely obligatory photoautotrofic.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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