LEC 14 - MCB 102 Professor Buchanan 4/3/09 Lecture 28 ASUC...

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MCB 102 Professor Buchanan 4/3/09 Lecture 28 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. ANNOUNCEMENTS I’ve already talked about the midterm and my upcoming office hours, so make sure you’re aware of the changes. LECTURE Lecture XIV: Carbohydrate Biosynthesis in Plants and Bacteria II Today, we’re going to cover the stages of carbon dioxide assimilation, ATP/NADPH requirements of the Calvin-Benson cycle, mechanisms of rubisco, fates of C3 products, and other topics. There are three main stages of carbon dioxide assimilation in photosynthetic organisms. The first is the fixation of carbon dioxide by rubisco to form 3-phosphoglycerate. Then there is the reductive stage, in which it is reduced to
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MCB 102 ASUC Lecture Notes Online: Approved by the UC Board of Regents 4/3/09 D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. 2 dihydroxyacetone and then glyceraldehyde-3- phosphate. The more tedious part is the regeneration phase, in which it is converted back to ribulose 1,5-bisphosphate to continue the cycle. There are 10 enzymes that participate in this; only two are unique. Eight are ones you have seen before. The stoichiometry of carbon dioxide fixation is shown in figure 20-14. We see that 3 ATP are used with ribulose 5-phosphate, 6 ATP with 3- phosphoglycerate, and 6 NADPH with 1,3- bisphosphoglycerate. There are three carbon dioxides in this cycle, so there is one glyceralde-3-phosphate (3-carbon product) that is formed. Looking more closely at the Calvin-Benson cycle, we start with the carboxylation phase. Ribulose 1,5-bisphosphate is converted by rubisco into PGA.
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This note was uploaded on 05/07/2009 for the course MCB 58168 taught by Professor Thorner during the Spring '09 term at University of California, Berkeley.

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LEC 14 - MCB 102 Professor Buchanan 4/3/09 Lecture 28 ASUC...

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