Lect12 - Lecture 12 The Calvin Cycle 1 Important concepts...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Lecture 12 The Calvin Cycle
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Important concepts 1. Memorize the intermediates of Calvin cycle Understand how to make 5C from 6C and 3C And understand the mechanism Storage of sugars in plant as starch and sucrose Balance sheet of ATP 2. Understand regulation of Calvin cycle Light activates Rubisco and thus Calvin cycle Thioredoxin activates Calvin cycle NADPH activates Calvin cycle
Background image of page 2
3 Calvin Cycle — Dark reactions (light- independent) The Whole Purpose: Use ATP and NADPH to reduce CO 2 Glyceraldehyde- 3-phosphate Where did ATP and NADPH come from?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Calvin Cycle: three stages 1. Fixation of CO 2 2. Reduction of 3- phospoglycerate to form hexose sugars 3. Regeneration of 1,5- bisphosphate
Background image of page 4
5 Stage 1: Fixation Condensation hydrolysis D ’ = -35.1 kJ mol -1 Driven by splitting into the two 3C’s Not in animals Here is where the CO 2 is added 5C 2x 3C
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A wasteful oxygenase reaction catalyzed by RuBisCo Not CO 2 6 • Also depends on the formation of carbamate (CO 2 is required) •Reaction rate: carboxylase reaction= 4*oxygenase reaction •Wasteful: consume O 2 and generate CO 2
Background image of page 6
7 Calvin Cycle: three stages 1. Fixation of CO 2 2. Reduction of 3- phospoglycerate to form hexose sugars 3. Regeneration of 1,5- bisphosphate
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Stage 2: Reduction Similar to gluconeogenesis 3C 6C 8
Background image of page 8
9 Calvin Cycle: three stages 1. Fixation of CO 2 2. Reduction of 3- phospoglycerate to form hexose sugars 3. Regeneration of 1,5- bisphosphate
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Stage 3: Regeneration of ribulose 1,5-bisphosphate How to convert 6C and 3C to 5C? transketolase + aldolase 10 Transfer a 2 C unit Aldole condensation
Background image of page 10
How to convert 6C and 3C to 5C?
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 38

Lect12 - Lecture 12 The Calvin Cycle 1 Important concepts...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online