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Lecture 19

MICB 201 Lecture 19: Cyanobacteria and Stratified Lakes

5 Pages

Course Code
MICB 201
Wade Bingle

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Chapter 10: The Autotrophic Way of Life (continued) Cyanobacteria (Blue green bacteria) Thylakoids membrane sacs derived from, but not continuous with, the cytoplasmic membrane Thylakoid membrane: functional equivalent of the cytoplasmic membrane Thylakoid lumen: functional equivalent of the periplasm PSII, ETC, PSI and ATP synthase are embedded in the thylakoid membrane. - thousands of copies of each PS and ATP synthase H are pumped out from the lumen to the cytoplasm. ATP synthesis occurs in the cytoplasm. ATP: PSI-PSI Cyclic and PSII-PSI Noncyclic photophosphorylation NADPH: PSII/PSI Oxygenic + PSI reduces NADP to NADPH = light driven redox reaction PSI refilled with electron from PSII which come from H 2 = light driven redox reaction OEC: Oxygen-Evolving (protein) Complex associated with PSII Oxidation of H 2 yields O 2s waste Cyanobacteria and chloroplasts Both have thylakoid membranes Why? SSU rRNA analysis shows that chloroplasts are the descendants of ancient cyanobacteria Cyanobacteria commonly store inorganic C from CO as o2ganic C in the form of glucose polymers: glycogen (G) or starch Chloroplasts of Eukarya also store glucose as starch Cyanobacteria aerobically respire stored glucose mostly at night when no light available Perform both oxidative phosphorylation and photophosphorylation in the same cell compartment - Respiratory ETC: Cytoplasmic membrane - Photosynthetic ETC: Thylakoid membranes Unlike eukaryotic cells eukaryotic cells that perform both oxidative phosphorylation and photophosphorylation use different organellar compartments Glucose-C stored in chloroplasts is respired in mitochondria - Oxidative phosphorylation: Mitochondria - Photophosphorylation: Chloroplasts Stratified Lakes Adaptations of phototrophs to different habitats can be seen Due to geometry (surface area: depth ratio) and topography of surround landscape, some lakes fail to undergo wind induced mixing at various times of the year Surface water does not mix with deeper water Get upper aerobic zone and lower anaerobic zone Example: Mahoney Lake in the BC Okanagan Different phototrophs have different arrangements of internal membranes an
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