Photosynthesis. Overview of Photosynthesis importance: fix tons of CO 2 per year, used as energy for virtually all organisms similarity to ETC/ox-phos,

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Presentation transcript:

Photosynthesis

Overview of Photosynthesis importance: fix tons of CO 2 per year, used as energy for virtually all organisms similarity to ETC/ox-phos, PPP and tied to gng 2 phases light-dependent rxns (light rxns) light-independent rxns (dark rxns) location: chloroplast

Detailed Chloroplast Structure Stroma thylakoid disk granum (grana) thylakoid lumen

Light Reactions Antenna molecules chlorophyll carotenoids “Special Pair” Photosystems I and II

Photosystem I (P700) Not confident all molecules have been ID’d Major molecules Some of the reactions which occur NADPH produced

Major molecules ATP produced Photosystem II (P680)

Photophosphorylation Proton gradient develops as e – are transported high pH inside thylakoid lumen protons come out through Fo of “C- ATPase” (CFo) F1 rotor forms ATP (CF 1 )

Cyclic Photophosphorylation P700 only NO NADPH produced, only ATP Major molecules: P700, Fd, Cyt. B6, Cyt f, PC

~Idealized Balanced Net Rxn O ATP + 2 NADPH + 2 H + 2 H 2 O + 4 ADP + 4 Pi + 2 NADP + “8” h

Dark Reactions - C3 plants 3PG first molecule produced containing the fixed carbon rubisco- the most abundant protein in the world what gluconeogenic enzymes required to get Glc from 3PG?

Similar to non-oxidative part of PPP Regeneration of Ribulose-1,5-bisphosphate

C4 Plants The Hatch-Slack Pathway Molecular logic Division of labor Additional Rxns

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