Referring to the figure below(first picture) explain photosynthetic electron transport. Then compare the process outlined in the figure with figure 1(second picture), What are the similarities and differences?

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Chapter21: Photosynthesis
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Problem 5P: The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If...
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Referring to the figure below(first picture) explain photosynthetic electron transport. Then compare the process outlined in the figure with figure 1(second picture), What are the similarities and differences?

OC PSII
e
2H₂O O₂ + 4H+
bom
e PQ
Cyt-bef
H+
ADP
H+
H₂
2H+
ATP
e
Active
site
4F45 H₂ase
PsaCF PsaD
OPSI
Oxygenic photosynthesis involving PSII & PSI
PC
Cyt-bof
Acetate
?
H+
e
000000 NDA2
e
PQ
Glucose
e
Complex I
(NDH1)
H+
Photomixotrophy involving only PSI
Trends in Biotechnology
Figure 1. Hydrogenases (H₂ases) were genetically attached to photosystem (PS)I to intercept electrons for H₂
production. H₂ production was light driven both in the engineered cyanobacterial strain (PsaD-HoxYH) as well as in the
engineered algal strain (H1). The cyanobacterial NiFe-H₂ase HoxYH was fused to PSI subunit PsaD, whereas the algal
FeFe-H₂ase HydA2 was inserted into the PSI subunit PsaC. H₂ production was partly driven by water oxidation at PSII as
desired. In addition, glucose provided electrons for cyanobacterial photosynthetic H₂ production in the mutant strain. If
acetate did likewise contribute to photoH₂ production in H1 is unclear, as low PSI-HydA2 levels in relation to PSII kept
the PQ pool reduced in this mutant.
Transcribed Image Text:OC PSII e 2H₂O O₂ + 4H+ bom e PQ Cyt-bef H+ ADP H+ H₂ 2H+ ATP e Active site 4F45 H₂ase PsaCF PsaD OPSI Oxygenic photosynthesis involving PSII & PSI PC Cyt-bof Acetate ? H+ e 000000 NDA2 e PQ Glucose e Complex I (NDH1) H+ Photomixotrophy involving only PSI Trends in Biotechnology Figure 1. Hydrogenases (H₂ases) were genetically attached to photosystem (PS)I to intercept electrons for H₂ production. H₂ production was light driven both in the engineered cyanobacterial strain (PsaD-HoxYH) as well as in the engineered algal strain (H1). The cyanobacterial NiFe-H₂ase HoxYH was fused to PSI subunit PsaD, whereas the algal FeFe-H₂ase HydA2 was inserted into the PSI subunit PsaC. H₂ production was partly driven by water oxidation at PSII as desired. In addition, glucose provided electrons for cyanobacterial photosynthetic H₂ production in the mutant strain. If acetate did likewise contribute to photoH₂ production in H1 is unclear, as low PSI-HydA2 levels in relation to PSII kept the PQ pool reduced in this mutant.
Stroma
4 photons
2 H₂O
PSII
Chlorophyll
4 e
O₂ + 4H+
Thylakoid lumen
Thylakoid membrane
PQ
Cyt bof
+++
I
4 e
8 H+
4 photons
8H+
++
PC
+
3
4 e
PSI
XX
PC
Glyceraldehyde-3-P.
I
2 NADP+ + 2 H+
12 H*
+ + + + +
2 NADPH
Calvin-
Benson
cycle
3 ATP
3 CO₂
3 ADP
+3 P₁
Chloroplast
ATP synthase
complex
12 H+
Transcribed Image Text:Stroma 4 photons 2 H₂O PSII Chlorophyll 4 e O₂ + 4H+ Thylakoid lumen Thylakoid membrane PQ Cyt bof +++ I 4 e 8 H+ 4 photons 8H+ ++ PC + 3 4 e PSI XX PC Glyceraldehyde-3-P. I 2 NADP+ + 2 H+ 12 H* + + + + + 2 NADPH Calvin- Benson cycle 3 ATP 3 CO₂ 3 ADP +3 P₁ Chloroplast ATP synthase complex 12 H+
Expert Solution
Introduction

Electron transport in oxygenic photosynthesis is a highly regulated process that involves the coordinated action of multiple protein complexes and pigments. The electrons are passed along a series of redox reactions, with energy being released at each step to drive proton pumping and ATP synthesis. Ultimately, the electrons are used to reduce NADP+ and produce NADPH, which provides the reducing power necessary for carbon fixation and other biosynthetic processes. 

Photosynthetic hydrogen production involves the transfer of electrons from water molecules to protons, resulting in the production of molecular hydrogen. The electron transport process is somewhat similar to the electron transport observed during oxygenic photosynthesis with some differences that are mentioned below. 

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