MBIO 3470 Lecture Notes - Lecture 23: Desulfotomaculum, Bdellovibrio, Anaerobic Respiration
13 Mar 2018
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Shortly after, the host or prey is killed (mechanism is not yet well understood) and the non-motile bdellovibrio is inserted into the periplasmic space. Within 5-10 minutes, morphological changes are apparent in the host the peptidoglycan structure is weakened and the cell becomes spherical. However, these structures are not spheroplasts, since they remain osmotically stable: these structures have been called bdelloplasts. The host membrane becomes porous and the nutrients can be taken up by bdellovibrio. Bdellovibrio grows in the periplasmic space as a long helical structure (several times longer than the original cell) The helical structure undertakes multiple fission to form single flagellate cells. The motile cells are liberated from the host and continue new infection. Anaerobic sulfur/sulfate reducers: a(cid:374)aero(cid:271)i(cid:272) sulfur/sulfate redu(cid:272)ers: i(cid:374) bergey"s they (cid:373)ake group 7. Sulfate reducers are primarily found in anaerobic sediments enriched in decomposing small mw organic compounds and sulfate.
