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Beknopte samenvatting H11 photosynthetic processes
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Deze samenvatting bevat hoofdstuk 11 uit het handboek. Het gaat over de verschillende processen die te maken hebben met de fotosynthese.
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H11. Photosynthetic processesInhoudsopgave
Overzicht........................................................................................................................................................ 2
Fotosysteem .................................................................................................................................................. 2
Lineare e- flow ............................................................................................................................................... 3
Cyclische e- flow ............................................................................................................................................. 3
Verschillen & gelijkenissen chloroplast & mitochondrie ................................................................................. 4
Lichtreactie .................................................................................................................................................... 4
Fotorespiratie ................................................................................................................................................ 6
, Overzicht
Figure 11.22b
Chloroplast
H2O CO2
Light
NADP+
ADP 3-Phosphoglycerate
LIGHT
+
REACTIONS:
Photosystem II Pi RuBP CALVIN
CYCLE
Electron transport chain
Photosystem I
ATP
Electron transport chain G3P
NADPH Starch
(storage)
O2 Sucrose (export)
Figure 11.13
© 2018 Pearson Education Ltd.
Fotosysteem
Photosystem STROMA
Photon Light- Reaction-
harvesting center Primary
complexes complex electron
acceptor
Thylakoid membrane
Thylakoid membrane
Chlorophyll (green) STROMA
e–
Transfer Special pair of chloro-
of energy phyll a molecules Protein
Pigment
THYLAKOID SPACE molecules subunits THYLAKOID
(INTERIOR OF THYLAKOID) (purple) SPACE
(a) How a photosystem harvests light (b) Structure of a photosystem
= soort eiwit, veel chlorofielen è die gaan licht opnemen en het doorgeven aan mekaar tot
het bij het speciale chlorofiel a paar komt è e- gaat exciteren en ipv terug te vallen è
©primaire e- acceptor
2018 Pearson Education Ltd. wegkapen è daardoor chlorofiel paar mist e- en gaat e- aantrekken
, Figure 11.14_5
Lineare e- flow
7 Electron
transport chain
4 Electron Primary
transport chain electron Fd
Primary acceptor e– e–
8 NADP+
electron NADP+ + H+
acceptor Pq e–
reductase NADPH
2 H+ e–
2 Cytochrome
H2 O
complex
+
1/2 O2 3 Pc
e– P700
1
e–
P680 5 Light
Light 6
ATP
Pigment
molecules Photosystem I
Photosystem II (PS I)
(PS II)
1. Foton raakt pigment è E doorgegeven è P680 exciteert
© 2018 Pearson Education Ltd.
2. Aangeslagen elektron v P680 è primaire elektronenacceptor (nu P680+)
3. H2O gesplitst dr enzymen è e- van de waterstofatomen naar P680+ è P680
a) P680+ is het sterkste bekende biologische oxidatiemiddel
b) De H+ komen vrij in de thylakoïde ruimte
c) O2 komt vrij als bijproduct van deze reactie
4. Elektronen è elektronentransportketen è PS I
(Vrijgekomen E zorgt voor creatie van protongradiënt over thylakoïdemembraan)
5. Epot opgeslagen in de protongradiënt stimuleert productie ATP door chemiosmose
6. In PS I (zoals PS II) maar P700
a) P700+ accepteert e- dat is doorgegeven van PS II via de
elektronentransportketen
7. Elektronen è NADP+-reductase
8. NADP+-reductase katalyseert overdracht e- & reduceert deze tot NADPH
a. e- van NADPH zijn beschikbaar voor reacties van de Calvincyclus
b. Dit proces verwijdert ook een H+ uit het stroma
Figure 11.16
Cyclische e- flow
Primary
• Alleen PS 1 gebruikt, e- komt op
Primary Fd
acceptor primaire acceptor en komt dan op
acceptor Fd
NADP+
cytochrome complex…
Pq
NADP+
reductase
+ H+
• Er wordt ATP gemaakt, geen O2/
Cytochrome
complex
NADPH
NADPH
Pc • Kan cellen beschermen tegen door
licht veroorzaakte schade
Photosystem I
Photosystem II ATP
© 2018 Pearson Education Ltd.
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