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Preface to the Second Edition xi Preface to the First Edition xiii 1 Historical Background, Current Relevance and Perspectives 1 References 6 2 Some General Principles 7
2.1 Occurrence and Availability of Inorganic Elements in Organisms 7 Insertion: The Chelate Effect 14 Insertion: "Hard" and "Soft" Coordination Centers 14
2.2 Biological Functions of Inorganic Elements 14
2.3 Biological Ligands for Metal Ions 16
2.3.1 Coordination by Proteins: Comments on Enzymatic Catalysis 17 Insertion: The "Entatic State" in Enzymatic Catalysis 20
2.3.2 Tetrapyrrole Ligands and Other Macrocycles 22 Insertion: Electron Spin States in Transition Metal Ions 28
2.3.3 Nucleobases, Nucleotides and Nucleic Acids (RNA, DNA) as Ligands 31 Insertion: Secondary Bonding 32
2.4 Relevance of Model Compounds 34 References 34 3 Cobalamins, Including Vitamin and Coenzyme B12 37
3.1 History and Structural Characterization 37 Insertion: Bioorganometallics I [1] 38
3.2 General Reactions of Alkylcobalamins 41
3.2.1 One-electron Reduction and Oxidation 41
3.2.2 Co-C Bond Cleavage 42 Insertion: Electron Paramagnetic Resonance I 43
3.3 Enzyme Functions of Cobalamins 45
3.3.1 Adenosylcobalamin (AdoCbl)-dependent Isomerases 45 Insertion: Organic Redox Coenzymes 48
3.3.2 Alkylation Reactions of Methylcobalamin (MeCbl)-dependent Alkyl Transferases 51
3.4 Model Systems and the Enzymatic Activation of the Co-C Bond 52 References 53 4 Metals at the Center of Photosynthesis: Magnesium and Manganese 57
4.1 Volume and Efficiency of Photosynthesis 57
4.2 Primary Processes in Photosynthesis 59
4.2.1 Light Absorption (Energy Acquisition) 59
4.2.2 Exciton Transport (Directed Energy Transfer) 59
4.2.3 Charge Separation and Electron Transport 62 Insertion: Structure Determination by X-ray Diffraction 62
4.3 Manganese-catalyzed Oxidation of Water to O2 68 Insertion: Spin-Spin Coupling 73 References 75 5 The Dioxygen Molecule, O2: Uptake, Transport and Storage of an Inorganic Natural Product 77
5.1 Molecular and Chemical Properties of Dioxygen, O2 77
5.2 Oxygen Transport and Storage through Hemoglobin and Myoglobin 82
5.3 Alternative Oxygen Transport in Some Lower Animals: Hemerythrin and Hemocyanin 92
5.3.1 Magnetism 92
5.3.2 Light Absorption 93
5.3.3 Vibrational Spectroscopy 93 Insertion: Resonance Raman Spectroscopy 93
5.3.4 M¨ossbauer Spectroscopy 94 Insertion: M¨ossbauer Spectroscopy 94
5.3.5 Structure 95
5.4 Conclusion 96 References 96 6 Catalysis through Hemoproteins: Electron Transfer, Oxygen Activation and Metabolism of Inorganic Intermediates 99
6.1 Cytochromes 101
6.2 Cytochrome P-450: Oxygen Transfer from O2 to Nonactivated Substrates 103
6.3 Peroxidases: Detoxification and Utilization of Doubly Reduced Dioxygen 108
6.4 Controlling the Reaction Mechanism of the Oxyheme Group: Generation and Function of Organic Free Radicals 110
6.5 Hemoproteins in the Catalytic Transformation of Partially Reduced Nitrogen and Sulfur Compounds 112 Insertion: Gasotransmitters 113 References 114 7 Iron-Sulfur and Other Non-heme Iron Proteins 117
7.1 Biological Relevance of the Element Combination Iron-Sulfur 117 Insertion: Extremophiles and Bioinorganic Chemistry 118
7.2 Rubredoxins 122
7.3 [2Fe-2S] Centers 122
7.4 Polynuclear Fe/S Clusters: Relevance of the Protein Environment and Catalytic Activity 123
7.5 Model Systems for Fe/S Proteins 128
7.6 Iron-containing Enzymes without Porphyrin or Sulfide Ligands 130
7.6.1 Iron-containing Ribonucleotide Reductase 130
7.6.2 Soluble Methane Monooxygenase 132
7.6.3 Purple Acid Phosphatases (Fe/Fe and Fe/Zn) 133
7.6.4 Mononuclear Non-heme Iron Enzymes 133 References 135 8 Uptake, Transport and Storage of an Essential Element, as Exemplified by Iron 139 Insertion: Metallome 139
8.1 The Problem of Iron Mobilization: Oxidation States, Solubility and Medical Relevance 140
8.2 Siderophores: Iron Uptake by Microorganisms 141 Insertion: Optical Isomerism in Octahedral Complexes 144
8.3 Phytosiderophores: Iron Uptake by Plants 149
8.4 Transport and Storage of Iron 150
8.4.1 Transferrin 152
8.4.2 Ferritin 155
8.4.3 Hemosiderin 159 References 160 9 Nickel-containing Enzymes: The Remarkable Career of a Long-overlooked Biometal 163
9.1 Overview 163
9.2 Urease 164
9.3 Hydrogenases 166
9.4 CO Dehydrogenase = CO Oxidoreductase = Acetyl-CoA Synthase 169
9.5 Methyl-coenzyme M Reductase (Including the F430 Cofactor) 172 Insertion: Natural and Artificial (Industrial) C1 Chemistry 174 Insertion: Bioorganometallics II: The Organometallic Chemistry of Cobalt and Nickel 176
9.6 Superoxide Dismutase 177
9.7 Model Compounds 178 Further Reading 178 References 179 10 Copper-containing Proteins: An Alternative to Biological Iron 183
10.1 Type
1: "Blue" Copper Centers 186 Insertion: Electron Paramagnetic Resonance II 187
10.2 Type 2 and Type 3 Copper Centers in O2-activating Proteins: Oxygen Transport and Oxygenation 191
10.3 Copper Proteins as Oxidases/Reductases 195
10.4 Cytochrome c Oxidase 200
10.5 Cu,Zn- and Other Superoxide Dismutases: Substrate-specific Antioxidants 203 References 207 11 Biological Functions of the "Early" Transition Metals: Molybdenum, Tungsten, Vanadium and Chromium 211
11.1 Oxygen Transfer through Tungsten- and Molybdenum-containing Enzymes 211
11.1.1 Overview 211
11.1.2 Oxotransferase Enzymes Containing the Molybdopterin or Tungstopterin Cofactor 213 Insertion: "Oxidation" 214
11.2 Metalloenzymes in the Biological Nitrogen Cycle: Molybdenum-dependent Nitrogen Fixation 219
11.3 Alternative Nitrogenases 226
11.4 Biological Vanadium Outside of Nitrogenases 229
11.5 Chromium(III) in the Metabolism? 231 References 232 12 Zinc: Structural and Gene-regulatory Functions and the Enzymatic Catalysis of Hydrolysis and Condensation Reactions 235
12.1 Overview 235
12.2 Carboanhydrase 238
12.3 Carboxypeptidase A and Other Hydrolases 243
12.4 Catalysis of Condensation Reactions by Zinc-containing Enzymes 248
12.5 Alcohol Dehydrogenase and Related Enzymes 249
12.6 The "Zinc Finger" and Other Gene-regulatory Zinc Proteins 251
12.7 Insulin, hGH, Metallothionein and DNA Repair Systems as Zinc-containing Proteins 253 References 254 13 Unequally Distributed Electrolytes: Function and Transport of Alkali and Alkaline Earth Metal Cations 257
13.1 Characterization and Biological Roles of K+, Na+, Ca2+ and Mg2+ 257 Insertion: Heteroatom Nuclear Magnetic Resonance 262
13.2 Complexes of Alkali and Alkaline Earth Metal Ions with Macrocycles 264
13.3 Ion Channels 267
13.4 Ion Pumps 270 Further Reading 273 References 273 14 Catalysis and Regulation of Bioenergetic Processes by the Alkaline Earth Metal Ions Mg2+ and Ca2+ 277
14.1 Magnesium: Catalysis of Phosphate Transfer by Divalent Ions 277
14.2 The Ubiquitous Regulatory Role of Ca2+ 283 Further Reading 291 References 291 15 Biomineralization: The Controlled Assembly of "Advanced Materials" in Biology 295
15.1 Overview 295
15.2 Nucleation and Crystal Growth 299 Insertion: Dimensions 300
15.3 Examples of Biominerals 301
15.3.1 Calcium Phosphate in the Bones of Vertebrates and the Global P Cycle 301 Insertion: The Global P Cycle 305
15.3.2 Calcium Carbonate and the Global Inorganic C Cycle 306 Insertion: The Global C Cycle and the Marine Inorganic C Cycle 307
15.3.3 Amorphous Silica 308
15.3.4 Iron Biominerals 309
15.3.5 Strontium and Barium Sulfates 310
15.4 Biomimetic Materials 310 Further Reading 311 References 311 16 Biological Functions of the Nonmetallic Inorganic Elements 315
16.1 Overview 315
16.2 Boron 315
16.3 Silicon 315
16.4 Arsenic and Trivalent Phosphorus 316
16.5 Bromine 317
16.6 Fluorine 317
16.7 Iodine 318
16.8 Selenium 320 References 324 17 The Bioinorganic Chemistry of the Quintessentially Toxic Metals 327
17.1 Overview 327
17.2 Lead 329
17.3 Cadmium 332
17.4 Thallium 334
17.5 Mercury 335
17.6 Aluminum 340
17.7 Beryllium 342
17.8 Chromium and Tungsten 343
17.9 Toxicity of Nanomaterials 344 Further Reading 345 References 345 18 Biochemical Behavior of Radionuclides and Medical Imaging Using Inorganic Compounds 349
18.1 Radiation Risks and Medical Benefits from Natural and Synthetic Radionuclides 349
18.1.1 The Biochemical Impact of Ionizing Radiation from Radioactive Isotopes 349
18.1.2 Natural and Synthetic Radioisotopes 350
18.1.3 Bioinorganic Chemistry of Radionuclides 351 Insertion: Fukushima Daiichi, Chernobyl, Hiroshima and Nuclear Weapons Testing 353
18.1.4 Radiopharmaceuticals 356
18.1.5 Technetium: A "Synthetic Bioinorganic Element" 359
18.1.6 Radiotracers for the Investigation of the Metallome 362
18.2 Medical Imaging Bas