Original video: https://youtu.be/WRWGAperHN0
Delivered on: JAN 2024
Many mechanisms regulate the Calvin-Benson cycle
The efficient use of energy in the Calvin-Benson cycle requires the existence of specific regulatory mechanisms that ensure not only that all intermediates in the cycle are present at adequate concentrations in the light, but also that the cycle is turned off in the dark. To produce the necessary metabolites in response to environmental stimuli, chloroplasts achieve the appropriate rates of biochemical transformations through the modification of enzyme levels (µmoles of enzyme/chloroplast) and catalytic activities (moles of substrate converted/ [minute x mole of enzyme]).
Video Timestamps:
0:00 Introduction and recap on sugar precursor
7:41 Enzymes and limiting factor in biochemical reactions
9:30 List of enzymes and the activation of enzymes
9:54 Recap on light reaction
10:10 Light is involved in the activation of the enzyme
10:25 How does light activate enzymes and what list of enzymes
13:01 Rubisco activation
15:32 Why does Rubisco need to be activated?
24:32 Light regulates the Calvin cycle via the ferredoxin-thioredoxin system
29:40 Review the light reaction and explanation of Figure 10:6
30:29 The activated enzymes start to do regenerative properties
30:47 Enzymes are involved in each phase of the Calvin Cycle- Regeneration and Reduction phases
33:49 Light controls the assembly of chloroplast enzymes into supramolecular complexes
34:18 Explanation of supramolecular complexes
38:24 Light dissociates the disulphide bond of the enzymes
41:20 Summary of light in activation of the enzyme
43:30 Quiz
50:56 Explanation about field experiments and treatment preparations
1:20:10 End of class
Keywords: Calvin Cycle, Photosynthesis, Light-dependent reactions, Enzyme activation in plants, C3 pathway, Photorespiration, Plant metabolism, Carbon fixation, Reductive pentose phosphate pathway, Rubisco, Rubisco activase, Ferredoxin-thioredoxin system
Location:
Faculty of Agriculture, Universiti Putra Malaysia
Fakulti Pertanian, Universiti Putra Malaysia, 43000 Seri Kembangan, Selangor
XPMM+9J Seri Kembangan, Selangor
2.9845517506267742, 101.73803356324866
Attribution 4.0 International — CC BY 4.0 - Creative Commons
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