BISC207 Lecture Notes - Lecture 15: Thylakoid, P680, Plastocyanin

• School: University of Delaware
• Department: Biological Sciences
• Course: BISC207
• Professor: Nauen Jennifer

Document Summary

Light reaction: use water and light, make atp and nadph. Calvin cycle/dark reactions: use atp, nadph, co2 carbs. Photosystems: complexes of proteins and pigments that convert light to energy to chemical energy. Step 1: when sunlight excites electrons in a pigment, the molecule can fluoresce, release heat, pass the energy, or transfer an electron. Step 2: resonance energy transfer to p680 creates p680* Step 3: p680* transfers high energy electron to 1o electron acceptor. Step 4: oxidizing water gives p680+ a low energy electron ; also produces o2 and h. Psii is the only protein system that can oxidize water. Now continues electron transport from psii to plastoquinone (pq) Uses some of the energy to pump a proton across the membrane. Ps1 receives a low energy electron from pc. Electron is transferred to a iron rich compound ferredoxin. Ferredoxin works with nadh reductase (=n) to produce nadph in stroma. Atp synthase uses the proton gradient to produce atp in stroma.