seminars!!!! dr. christopher m. reddy, woods hole oceanographic institution. jean dreyfus boissevain...
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•SEMINARS!!!!Dr. Christopher M. Reddy, Woods Hole Oceanographic Institution.Jean Dreyfus Boissevain Lectureship"Hunting for Subsurface Oil Plumes in the Gulf of Mexico Following the Deepwater Horizon Disaster"
Location: SL150
Reception: 3:15 pm; Lecture: 4:00 pmWebpage
Figure 21-6 The five reactions of the PDC.
Pyruvate + CoA + NAD+→Acetyl CoA + CO2 + NADH
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Nucleophile and electron sink
Advantages of Multienzyme Complexes
• 1. Proximity→rate enhancements
• 2. Channeling—passing substrates around
• 3. Coordinated Control
Figure 21-6 The five reactions of the PDC.
Pyruvate + CoA + NAD+→Acetyl CoA + CO2 + NADH
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e 77
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Nucleophile and electron sink
Advantages of Multienzyme Complexes
• 1. Proximity→rate enhancements
• 2. Channeling—passing substrates around
• 3. Coordinated Control
Figure 21-17 Factors controlling the activity of the PDC.(b) Covalent modification in the eukaryotic complex.
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Citrate synthase mechanism
• http://bcs.whfreeman.com/lehninger5e/pages/bcs-main.asp?v=&s=16000&n=00010&i=16010.01&o=|00610|00580|00590|00510|00540|00600|00550|00570|00630|00010|00020|00030|00040|00070|00080|00090|00100|01000|02000|03000|04000|05000|06000|07000|08000|09000|10000|11000|12000|13000|14000|15000|16000|17000|18000|19000|20000|21000|22000|23000|24000|25000|26000|27000|28000|99000|
The succinyl-CoA synthetase reaction. (b) Active site of succinyl-CoA synthetase of E. coli . The active site includes part of both the α and the β (brown) subunits. The power helices place the partial positive charges of the helix dipole near the phosphate group of P–His246 in the α chain, stabilizing the phosphohistidyl enzyme.
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The role of biotin in the reaction catalyzed by pyruvate
carboxylase. Biotin is attached to the enzyme through an amide bond
with the ε-amino group of a Lys residue, forming biotinyl-enzyme.
Biotin-mediated carboxylation reactions occur in two phases,
generally catalyzed in separate active sites on the enzyme as
exemplified by the pyruvate carboxylase reaction.
The role of biotin in the reaction catalyzed by pyruvate carboxylase. Biotin-mediated carboxylation reactions occur in two phases, generally catalyzed in separate active sites on the enzyme as exemplified by the pyruvate carboxylase reaction. In the first phase (steps 1 to 3), bicarbonate is converted to the more activated CO2, and then used to carboxylate biotin.
The biotin acts as a carrier to transport the CO2
from one active site to another on an adjacent monomer of the tetrameric enzyme.
In the second phase (steps 5 to 7), catalyzed in this second active site, the CO2 reacts with pyruvate to form oxaloacetate.