Enzymes and Drugs

Preface ix

Introduction xi

Chapter 1 Enzyme Kinetics, Inhibition and Activation 1

1.1 Michaelis and Menten theory 2

1.2 Irreversible inhibitors 3

1.3 Reversible inhibitors in a Michaelian system 4

1.3.1 Reversible competitive inhibitors 4

1.3.2 Reversible non-competitive inhibitors 7

1.3.3 Reversible uncompetitive inhibitors 11

1.4 Allostery: inhibitors and activators 13

1.4.1 Allosteric enzyme kinetics 14

1.4.2 Mechanism of allosteric enzyme regulation 16

1.5 References 17

Chapter 2 Targeted Viral and Microbial Enzymes 19

2.1 Viral targets 20

2.1.1 Herpes group viruses: DNA-dependent DNA polymerases (EC 2) 20

2.1.2 Influenza virus: exo-alpha-sialidase or neuraminidase (EC 3) 21

2.1.3 HIV protease (EC 3) 22

2.1.4 HIV reverse transcriptase (RNA/DNA-dependent DNA polymerase -- EC 2) 26

2.1.5 HIV integrase (EC 2) 29

2.1.6 Hepatitis C virus (HCV): RNA-dependent RNA polymerase (NS5B -- EC 2) and viral protease (NS3-4A -- EC 3) 30

2.2 Bacterial targets 31

2.2.1 Specific target (action mainly focused on the Mycobacterium tuberculosis species) 31

2.2.2 General actions 33

2.3 Fungal targets 64

2.3.1 1,3-beta-glucan synthase (EC 2) 64

2.3.2 Squalene mono-oxygenase (EC 1) 65

2.3.3 14-sterol demethylase (EC 1) 65

2.3.4 Thymidylate synthase (EC 2) 66

2.4 Parasite targets 66

2.4.1 Ornithine decarboxylase (EC 4) 66

2.4.2 Heme polymerase (EC 2) 67

2.5 References 67

Chapter 3 Targeted Human Enzymes 71

3.1 Treatment via effectors 71

3.1.1 Ophthalmology 71

3.1.2 Neurology 73

3.1.3 Metabolism and endocrinology 79

3.1.4 Cardiovascular and immunology 94

3.1.5 Oncology 115

3.1.6 Phosphatome and Kinome 131

3.2 Enzyme replacement therapy 143

3.2.1 Gout 143

3.2.2 Acute leukemia and non-Hodgkin's lymphoma 144

3.2.3 Hypophosphatasia 144

3.2.4 Chronic obstructive pulmonary disease 144

3.3 References 144

Chapter 4 What are the New Targets? 151

4.1 Inhibition and activation strategies: advantages, disadvantages and current status 151

4.1.1 Irreversible inhibitors 152

4.1.2 Competitive inhibitors 153

4.1.3 Non-competitive inhibitors 155

4.1.4 Uncompetitive inhibitors 156

4.1.5 Allosteric effectors 156

4.1.6 Other strategies 157

4.2 Exogenous and endogenous targets 157

4.2.1 Exogenous targets 158

4.2.2 Endogenous targets 162

4.3 Rare diseases and enzymes 166

4.3.1 Lysosomal storage diseases 167

4.3.2 Other rare genetic diseases linked to one or more enzymes 176

4.4 References 176

Chapter 5 Which "New" Drugs are We Moving Towards Now? 181

5.1 Chemistry 181

5.1.1 Combinatorial chemistry 181

5.1.2 Vectorization 182

5.2 Biology 183

5.2.1 Inducers and repressors 184

5.2.2 Antibodies 184

5.3 Genetics 186

5.3.1 Gene therapy 186

5.3.2 Antisense strategies 193

5.4 References 194

Conclusion 197

Index 201