Monoimidazole complexes of iron por phyrins 268 269

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Monoimidazole complexes of iron por- phyrins, 268, 269 Monooxygenase enzymes, 284, 294, 332 Mossbauer spectroscopy, 193, 374 481,482 Mugeneic acid, 25 Mugeneic acid-Co(III) complex, 26 Multisite redox enzymes, 400 Mung bean nuclease, 500 MWC two-state model for cooperative li- gand binding, 180, 181 Mycobactin, 21 Myeloperoxidase, 295 Myochrisin,518 Myoglobin, 184 active-site structure, 231 INDEX 605 cyanogen-bromide modified, 348, 349 distal ligand mutations, 235 electron transfer, 347-349 electron-tunneling pathway, 348 ligand-binding parameters, 239 oxy and carbonmonoxy derivatives, 203 structure, 169 thermodynamic parameters for electron transfer, 348 Myosin, 141 Myosin light-chain kinase (MLCK), 138 N N 2 (see nitrogen) N 2 H 2 (diimine, diazene, diamide), 415 N 2 H 4 (hydrazine), 415 Nested al!ostery, 188 Neutral protease, 39 Nickel, biological significance, 4 Nickel carcinogenicity, 513 Nickel, EPR signals in hydrogenases, 409 Nickel hydrogenases, 409, 410 activation/reactivity scheme for, 410 inactivation by dioxygen, 412 Nickel(H)-rubredoxin, 377 Nickel-iron hydrogenases, 405, 409, 411 Nicotinamide, 315 Nicotinamide adenine dinucleotide (NAD),316 Nicotinamide adenine dinucleotide phos- phate (NADP), 316 Nicotinic cholinergic agonist, 132 NitB-,421 nit D and nit K genes, 419 nit genes, 413, 414 Nit V mutants, 421 Nit V nitrogenase, 422 NiFe3S4 thiocubane structures, 395 Nitrate reductase, 12 Nitric oxide binding, 208, 209 Nitrilotriacetate, III Nitrogen (N 2 ), 415 binding modes, 438 complexes, 437 kinetic inertness, 415 reduction to NH 3 , 415, 416 Nitrogen fixation, 412-416 in Klebsiella pneumoniae, 414
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606 INDEX Nitrogen fixation (continued) inhibition by Hz, 433 intermediates, 414 role of ATP, 432 Nitrogenases,412 all-iron, 435, 436 alternative, 433 crystal structure, 442 FeMo protein, 414 FeMoco structure, 444 homogeneous preparations, 419 inhibitors, 432 models, 436 molybdenum, properties of, 417 P-clusters, 422, 423 purity, 419 redox activation, 401 substrates, 431, 432 Nitroso species binding, 209 NMR (see nuclear magnetic resonance) Non-cooperative dioxygen binding, 174 Non-heme iron dioxygen carriers, 188 Nonadiabatic electron transfer, 338, 339 Nonbiological Fe-S clusters, 398, 399 Nonsymbiotic nitrogen-fixing plants, 413 Normal free-energy region, 340 Nuclear magnetic relaxation dispersion (NMRD), 63, 64 Nuclear magnetic resonance (NMR), 193 43Ca, 152 113Cd, 146 19F, I 7 of Fe-S proteins, 377 of metal complex/nucleic acid struc- tures, 473-475 probes of Caz +, I 17 67Zn, 44 Nucleases, 500 Nucleic acid/metal complex interactions, 468, 479, 484, 485 chirality, 468, 480 H-bindimg, 462 luminescence, 480 Nucleic acids hydrolytic chemistry, 465-467 metal coordination, 459, 460 reactions with metals, 462 redox chemistry with metal complexes, 463,489 structures, 456 Nucleophilic addition of hydride, 89 Nucleophilic ~ddition of hydroxide, 89 Nucleoside diphosphate kinase, 97 Nucleosome core particles, 540 o Olefin binding, 438 Oligonucleotide cleavage by metal com- plexes, 476-479 Orbitals, bonding u and antibonding u*, 403 Organelles, 162 Organomercury lyase, 511, 512 ortho hydrogen, 403 Osmate esters, 461 Osmium tetroxide, 461, 485 Osteoblast, 157, 158 Osteocalcin, 157 Osteoclast, 157, 158 Osteocyte, 158 Osteogenic cell, 158 Osteoid, 158 Osteonectin, 157 Osteoporosis, 157, 162 Outer-sphere electron-transfer reaction, 335, 336 Outer-sphere reorganization energy, 340 Ovarian carcinomas, 527 Oxidant scavengers, 262 Oxidation of 284 of
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