Name: photosystem i and nadph formation
Uploaded: 2019-03-11T09:21:12.000Z
Duration: 1 min 27 s
Channel: JoVE

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Photosystem I

- [Instructeur] Vergelijkbaar met Fotosystem II, worden in Fotosystem I, fotonen ook geabsorbeerd door pigmentmoleculen in het lichtoogstcomplex om energie te kunnen relateren aan het reactiecentrum, en na oxidatie, wordt een hoogenergetisch elektron doorgegeven aan de primaire elektronenacceptor. Echter, deze keer worden de ontbrekende elektronen uit het chlorofyl A-paar vervangen door elektronen die vanuit Fotosysteem II door de elektronentransportketen reizen. Van het dragermolecuul plastochinon, tot het dubbele eiwit, cytochroomcomplex, tot een ander eiwit, plastocyanine.

De energie die vrijkomt bij dit proces wordt gebruikt om protonen in de thylakoïde ruimte te pompen, via het cytochroomcomplex, waardoor een protongradiënt ontstaat dat ATP genereert door middel van chemiosmosis. Zodra het elektron door dit reactiecentrum gaat, komt het in de tweede elektronentransportketen terecht, te beginnen met het eiwitcomplex ferredoxine. Van hieruit wordt het ene elektron geaccepteerd door NADP+ reductase, samen met een ander elektron en proton die uiteindelijk het energieproject NADPH vormen.

fotosysteem i

Hoewel het structureel vergelijkbaar is met fotosysteem II (PSII), heeft fotosysteem I (PSI) een andere elektronenleverancier en elektronenacceptor.

Beide fotosystemen werken samen. Een opgewonden elektron van PSII wordt doorgegeven aan PSI via een elektronentransportketen in het thylakoïdemembraan van de chloroplast, die bestaat uit het dragermolecuul plastochinon, het tweevoudige eiwitcytochroomcomplex en plastocyanine. Terwijl elektronen zich tussen PSII en PSI bewegen, verliezen ze energie en moeten ze opnieuw worden geactiveerd door PSI. Als resultaat wordt een ander foton geabsorbeerd door de pigmenten van het PSI-antennecomplex en doorgegeven aan het PSI-reactiecentrum, genaamd P700. P700 wordt geoxideerd en stuurt een hoogenergetisch elektron naar NADP+ om NADPH te vormen. Net zoals PSII de energie opvangt om protongradiënten te creëren voor de productie van ATP, vangt PSI de energie op om NADP+ te reduceren tot NADPH.

Nadat de energie van de zon is omgezet in chemische energie in de vorm van ATP- en NADPH-moleculen, beschikt de cel over de brandstof die nodig is om koolhydraatmoleculen te bouwen voor langdurige energieopslag in het stroma van de bladgroenkorrel.

Fotosysteem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these ...

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photosystem i and nadph formation

Photosystem I helps convert light energy into NADPH during photosynthesis. It works with photosystem II in the thylakoid membrane of the chloroplast, but it uses a different electron supplier and a different electron acceptor.

Electrons excited in photosystem II move to photosystem I through an electron transport chain. That chain includes plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As the electrons travel between the two photosystems, they lose energy and must be re-energized by photosystem I.

To do this, the pigments in the photosystem I antenna complex absorb another photon. The energy is passed to the reaction center called P700. P700 then sends a high-energy electron to NADP+ and forms NADPH.

Photosystem II uses light energy to build a proton gradient and make ATP. Photosystem I captures light energy to reduce NADP+ into NADPH. After ATP and NADPH are made, the cell has the energy it needs to build carbohydrate molecules for long-term storage in the stroma of the chloroplast.

Photosystem I and NADPH Formation

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Photosystem II is a multi-protein complex that captures light energy and begins the flow of electrons in photosynthesis. It uses bound pigments to harvest photons and send that energy to its reaction center. From there, the energy continues through the electron transport chain and on to photosystem I. The pigments in photosystem II include chlorophyll a, chlorophyll b, and carotenoids. They are arranged in two parts of the photosystem: the antenna complex and the reaction center. The antenna...

photosystem i

Photosystem I helps convert light energy into NADPH during photosynthesis. It works with photosystem II in the thylakoid membrane of the chloroplast, but it uses a different electron supplier and a different electron acceptor. Electrons excited in photosystem II move to photosystem I through an electron transport chain. That chain includes plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As the electrons travel between the two photosystems, they lose energy and must be...

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key terms and concepts

Learn how photosystem I re-energizes electrons, reduces NADP+ to NADPH, and works with photosystem II to help build sugars in chloroplasts.

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Photosystem I and NADPH Formation

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