Krebs Cycle and other Fun Stuff

Follow the electron in the Light Reaction in Rhodopseudomonas!

Special Pigment Pair:
1st Electron Acceptor:
2nd Electron Acceptor: (this does not have an cofactor)
Immobile becomes a Semiquinone
Fully reduced QH2 ()
: pumps H+ into the Periplasm
Completes the Cycle: (has a group)
Its purpose is to neutralize the charge left behind in by photoinduced charge separation.

Follow the electron in the light reaction of a plant!

(4 photons to oxidize 2 H2O, held by clusters)
Special Pigment Pair: (PSII)
1st Electron Acceptor:
Immobile Quinone: (can become QH2)
(pumps 2H+ per photon)
1 Electron Carrier: (soluble and faces thylakoid lumen, has reducible Cu2+)
Special Pigment Pair:
1st Electron Acceptor:
Immobile Quinone
1 Electron Carrier: (can also reduce , which activates enzymes)
(stepwise reduction of to 1 electron at a time)
Converts to per 2 electrons

Notes:
If no is available, the electrons can go from to the (pumps 2H+ per photon).
The net charge between the stroma and thylakoid lumen is balanced by ions, which flow as H+ flows .

Let's start off this final with a bang! Fill in the blanks for what happens at the start of each important process.

:
first Ru-1,5BP. It follows this up with a reaction. Then, the resulting unstable 6 carbon compound is into . This 3 carbon molecule is built into hexose using first then .

:
first gets , producing . Then, the lactone gets opened. The product gets again, producing and . This 5 carbon ketose is turned into a different 5 carbon ketose or a 5 carbon aldose by or , respectively.

:
attaches a group onto the fatty acid chain. This requires ATP because AMP is the byproduct. The molecule then must be associated with , which utilizes a to dump the molecule into the .

first gets converted by into , leaving behind a and generating . Recall, our 3 carbon sugar comes in as a pair from . Then, combines with (which is the first to bind due to ) to form which is held firm by . What drives the 6 carbon sugar to formation is the bond. Several and Acid residues assist in activating each species for attack. Only when is produced, occurs, and leaves. converts that into via a and reaction. Several prosthetic groups are used to attract the carboxylate groups for the catalyzation. then produces , and first is generated then falls off. follows up this transformation with another and production, very similar to PDH's mechanism, and creating . We still have the carbons from Acetyl CoA. forms using a from solution to displace the CoA. This is then grabbed by a residue and transferred to a waiting group. Then, , located on the Mitochondrial Membrane, facilitates in the oxidation reaction for generation of . In the process, is produced. is the enzyme that produces , utilizing a reaction, which then can be converted back into by , producing , which is the only reaction that has a Delta G value. The disappearance of is the driving force for the reaction.