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Allosteric Enzymes

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Page 1: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Allosteric Enzymes

Page 2: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Allosteric enzyme kinetics

Page 3: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Determination of cooperativity coefficient

Page 4: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Inhibited Enzyme Kinetics

Inhibitor Inhibitor binds to enzymes and reduces their activity.

Irreversible inhibitor Heavy metals form a stable complex with enzymes.

Pd, Cd, Hg, and others

May be reversed only by using chelating agents such as EDTA and citrate.

Reversible inhibitor Dissociate more easily from the enzyme

Page 5: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Reversible Enzyme Inhibition

Competitive inhibition

Noncompetitive inhibition

Uncompetitive inhibition

Substrate inhibition

Page 6: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Competitive Inhibition

Page 7: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The
Page 8: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

L-B Plot

Page 9: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Noncompetitive Inhibition

Page 10: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The
Page 11: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

L-B Plot

Page 12: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Uncompetitive Inhibition

Page 13: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The
Page 14: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

L-B Plot

Page 15: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Substrate Inhibition

Page 16: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Substrate Inhibition

Page 17: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The
Page 18: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The
Page 19: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

L-B Plot

Page 20: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

L-B Plot

Page 21: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Effect of pH

Page 22: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Effect of pH

Page 23: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Effect of pH

Page 24: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Effect of pH

Page 25: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Effect of pH

Page 26: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Effect of Temperature

Page 27: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Effect of Temperature

Temperature Activation Temperature Deactivation

where

Page 28: Allosteric Enzymes - Seoul National Universityocw.snu.ac.kr/sites/default/files/NOTE/Week 04.pdf · Allosteric enzymes. Some enzymes have more than one substrate binding site. The

Insoluble Substrates