VITAMIN B3 and VITAMIN B2

V I T A M I N B 3 a n d V I T A M I N B 2 Ha Thi Thuy Hoa K15 Honor Program of Biology C l i c k i c o n t o a d d p i c t u r e OUTLINE I. Introduction II. Vitamin B3: Nicotinic acid and Vitamin B3- the nicotinamide coenzymes : NAD+ and NADP+ III. Vitamin B2: Riboflavin and the Flavin Coenzymes FAD, FMN IV. Summary and Question I. INTRODUCTION What is the most important function of Vitamin B ? Why do we need vitamin B everyday?  Play important roles in cell metabolism. = They are coenzymes for carrying hydrogens and their electrons during metabolic reactions II.Nictotinic acid Nicotinamide adenine dinucleotide (phosphate) NAD NADP Reaction of NAD [...]... in DIET OF VITAMIN B3 DIET OF VITAMIN B2 IV QUESTIONS AND CONCLUSION  1 How many electrons NAD and FAD can carry? Answer: NADH can transfer 2 electrons and 1 proton while FAD can accept or donate electrons 1 or 2 at a time and also 1 or 2 protons  2 What is flavoprotein? Answer: Flavoprotein are enzymes that catalyze oxidation-reduction reactions using either FMN or FAD as coenzymes FMN and FAD bind... using either FMN or FAD as coenzymes  FMN and FAD bind tightly to proteins such as succinate dehydrogenase(in Krebs cycle) They do not transfer electrons by diffusing from one enzymes to another  Under the reversible reduction, accepting either one or two electrons in the form of one or two hydrogen atoms from a reduced substrate  The fully reduced form : FADH2 and FMNH2 Reaction of Riboflavin Function . Hoa K15 Honor Program of Biology C l i c k i c o n t o a d d p i c t u r e OUTLINE I. Introduction II. Vitamin B3: Nicotinic acid and Vitamin B3- the nicotinamide coenzymes : NAD+ and. chloroplast in plant. DIET OF VITAMIN B3 DIET OF VITAMIN B2 IV. QUESTIONS AND CONCLUSION  1. How many electrons NAD and FAD can carry? Answer: NADH can transfer 2 electrons and 1 proton while FAD. and NADP+ III. Vitamin B2: Riboflavin and the Flavin Coenzymes FAD, FMN IV. Summary and Question I. INTRODUCTION What is the most important function of Vitamin B ? Why do we need vitamin B everyday?  Play