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Lecture 19

MICB 201 Lecture Notes - Lecture 19: Mahoney Lake, Atp Synthase, Oxidative PhosphorylationPremium

5 pages77 viewsWinter 2017

Department
Microbiology
Course Code
MICB 201
Professor
Wade Bingle
Lecture
19

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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 H2O = light driven redox
reaction
OEC: Oxygen-Evolving (protein) Complex associated with PSII
Oxidation of H2O yields O2 as 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 CO2 as organic C in the form of
glucose polymers: glycogen (G) or starch
Chloroplasts of Eukarya also store glucose as starch
Cyanobacteria aerobically respire stored gluose… ostly 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
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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 and
photopigments that absorb different wavelengths of light
Affects where they grow in the lake
Short wavelengths: filtered out at top of the lake
Longer wavelengths: penetrate farther
Green sulfur bacteria
- Efficient at harvesting light
- Allows them to grow at the greatest depths in lakes
where light is dim
Some stratified lakes: Purple bacteria grow to such high
population densities they block out the light, so green sulfur
ateria a’t gro
Sometimes happens in Mahoney Lake
10.4 Anabolism
The ost iportat aaoli aspet of the Autotrophi Way of Life is for a orgais is
the use of CO2 as a C-source.
Photosynthesis
Use of light energy to synthesize the ATP and NADPH needed to reduce CO2-C
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