MBIO 3280 Lecture Notes - Lecture 17: Cueva De Villa Luz, Green Sulfur Bacteria, Purple Sulfur Bacteria

• School: University of Manitoba
• Department: Microbiology
• Course: MBIO 3280
• Professor: Vladimir Yurkov

Document Summary

Also has sulfur granules intracellularly refract light under microscope. Beggiatoa mats at h2s seeps on ocean floor (looks like black algea on bottom of ocean floor) Chemolithoautotrophs like thiobacillus spp. (acidithiobacillus spp. : t. thiooxidans use o2, produce h2so4, acid tolerant, t. ferrooxidans use o2, produce h2so4, acid tolerant, t. denitrificans use no3-, does not produce acid. Hyperthermophilic archaea like sulfolobus spp (>60 degrees c) Use sulfide as a source of e- (get energy from light) That are notrmally oxygenic phototrophs can also oxidize sulfide to sulfur under some conditions: oscillatoria limnetica, extracellular s(prime) granules. Most microbes use so4-2 as biosynthetic s source. Internally reduce it to sulfide (requires atp) (assimilatory sulfate reduction: reacts with serine to form cysteine (otherwise would bind to cytochromes, rarely a limiting nutrient. Many organosulfur compounds can be formed from organic sulfur: proteins, coenzyme a, vitamins, odors, flavours. Dimethylsulfonium propionate (dmsp) (ch3)2sch2ch3coo: also called dimethylpeothetin, can (cid:271)e degraded as (cid:272)ar(cid:271)on + energy sou(cid:272)e, releasing .