bacterial photosynthesis lecture...
TRANSCRIPT
Bacterial PhotosynthesisLecture 9‹header›
1
Fig. 5.23c
Reactions involved in Photosynthesis
Light reactions or phase:
Dark reactions or phase:Calvin Benson Cycle (C3 pathway, photosyntheticcarbon cycle, reductive pentose phosphate pathway)Reverse (reductive) Krebs (TCA) cycle
Hydroxypropionate pathway
Oxygenic- ATP and NAD(P)HAnoxygenic- purple primarily ATP; green-sulfur/heliobacteria can generate ATP and reducingpower
CO2 fixation
Bacterial PhotosynthesisLecture 9‹header›
2
Fig. 17.8
β-carotene (carotenoid)Isoprenoids:
Primary function: photoprotective role
Tetrapyrroles:
Bile pigments
Fig. 17.10
phycobiliproteinsphycobilisomes
cyanobacteriared algae
Fig. 17.10b
Phycobilisome Tetrapyrrole: Porphyrins
Fig. 17.3a
succinyl-CoA
Plants, algae, cyanobacteria Purple, green-sulfur, heliobacteria
Bacterial PhotosynthesisLecture 9‹header›
3
Arrangement of light-harvestingchlorophylls/bacteriochlorophylls
excitons
Reaction center chlorophylls/bacteriochlorophyllsFig. 17.6
Antenna pigments
Complexes of 50-300 molecules
Fig. 17.5
Chloroplast
Bacterial Photosynthetic Apparatus
heliobacteria
Chlorosome of Green-sulfur Bacteria
Bacterial PhotosynthesisLecture 9‹header›
4
Anoxygenic photosyn.one photosystem(purple)
Fig. 17.4
Bacteriopheophytine-
Electron Flow in Purple Bacteria
Fig. 17.15
Organization of e-
carriers in purple bacteria
AnoxygenicPhotosynthesis (purple)
Fig. 17.4
H2---> NAD(P)Hhydrogenase
Electron Flow in Purple Bacteria
Lactate orsuccinate (e-)
Fig. 17.18
H2S ---> So
(H2S, So, S2O3-2,
Fe+2) H2S2O3
-2---> SO4-2
NADH
Bacterial PhotosynthesisLecture 9‹header›
5
\
Oxygenic Photosynthes
Fig. 17.19
Fig. 17.22
Calvin-Benson Cycle
phosphoribulokinase
Ribulose bisphosphatecarboxylase (RubisCO)