User talk:Cole Faulkner: Difference between revisions
From Proteopedia
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
== Photosynthetic Pathway == | == Photosynthetic Pathway == | ||
Photosynthesis is the pathway that uses light energy (photons) to drive the production of Adenosine Triphosphate. As photons hit the organism, a small percentage hit the photo-reaction center of P680 (Photosystem II) and P700 (Photosystem I) to excite either P680 (2AXT) or P700 (2O01) which then drives electron transport until the final products are reduced ferradoxin and NADPH. | Photosynthesis is the pathway that uses light energy (photons) to drive the production of Adenosine Triphosphate. As photons hit the organism, a small percentage hit the photo-reaction center of P680 (Photosystem II) and P700 (Photosystem I) to excite either P680 (2AXT) or P700 (2O01) which then drives electron transport until the final products are reduced ferradoxin and NADPH. | ||
| Line 8: | Line 7: | ||
The cascade of oxidation-reduction reactions starts off with an electronically excited P680, which donates electrons to a pheophytin acceptor (Ph). From there, the pheophytin acceptor donates electrons to QA (which is a protein-bound plastoquinone), and then QA donates its electrons to QB (another protein-bound plastoquinone). Next, QB donates the electrons to QH2 (reduced plastoquinone), which then donates the electrons to the cytochrome b6f complex. When this occurs, the cytochrome b6f complex donates it electrons to plastocyanin (PC) and also releases eight protons into the thylakoid membrane. Finally, the plastocyanin transfers its electrons to P700 in order to start photosystem I. The overall reaction for photosystem II is 2H2O (with 4 photons excitation)-> 4H+ + 4e- +O2 (2). | The cascade of oxidation-reduction reactions starts off with an electronically excited P680, which donates electrons to a pheophytin acceptor (Ph). From there, the pheophytin acceptor donates electrons to QA (which is a protein-bound plastoquinone), and then QA donates its electrons to QB (another protein-bound plastoquinone). Next, QB donates the electrons to QH2 (reduced plastoquinone), which then donates the electrons to the cytochrome b6f complex. When this occurs, the cytochrome b6f complex donates it electrons to plastocyanin (PC) and also releases eight protons into the thylakoid membrane. Finally, the plastocyanin transfers its electrons to P700 in order to start photosystem I. The overall reaction for photosystem II is 2H2O (with 4 photons excitation)-> 4H+ + 4e- +O2 (2). | ||
Photosystem I (P700) whose PDB ID is 2O01 works as in transferring electrons and driving electron transport through the photosystem until the final product NADPH is synthesized. The overall equation is4e^-+2H^++2〖NADP〗^+→2NADPH. The reaction is driven by 4 photons of light which excite photosystem I and make it move forward. The A0 complex known as Chlorophyll A0 is an early electron acceptor. It accepts the electrons from the excitation of P700 before passing them along to the next early electron acceptor. | Photosystem I (P700) whose PDB ID is 2O01 works as in transferring electrons and driving electron transport through the photosystem until the final product NADPH is synthesized. The overall equation is4e^-+2H^++2〖NADP〗^+→2NADPH. The reaction is driven by 4 photons of light which excite photosystem I and make it move forward. The A0 complex known as Chlorophyll A0 is an early electron acceptor. It accepts the electrons from the excitation of P700 before passing them along to the next early electron acceptor. | ||
