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Dehydrogenase

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297:, or nicotinamide adenine dinucleotide, is a dinucleotide, containing two nucleotides. One of the nucleotides it contains is an adenine group, while the other is nicotinamide. In order to reduce this molecule, a hydrogen and two electrons must be added to the 6-carbon ring of nicotinamide; one electron is added to the carbon opposite the positively charged nitrogen, causing a rearrangement of bonds within the ring to give nitrogen more electrons; it will lose its positive charge as a result. The other electron is "stolen" from an additional hydrogen, leaving the hydrogen ion in solution. 401:(ALDH) are NAD dependent enzymes that function to remove toxic aldehydes from the body, functioning mostly in the mitochondria of cells. These enzymes are largely responsible for the detoxification of acetylaldehyde, which is an intermediate in the metabolism of ethanol. It has been shown that a mutation in the ALDH2 gene (one of 19 aldehyde dehydrogenase genes) is what leads to the common occurrence in East Asian population of a flushed face after consuming alcohol, due to the build-up of acetaldehyde. This build-up of acetaldehyde also causes headaches and vomiting ( 171: 203: 386: 99: 313: 1441: 274: 131: 333:
pathways that convert substrates to more complicated products, using ATP. The reasoning behind having two separate electron carriers for anabolic and catabolic pathways relates to regulation of metabolism. The ratio of NADP to NADPH in the cell is kept rather low, so that NADPH is readily available as a reducing agent; it is more commonly used as a reducing agent than NADP is used as an oxidizing agent.
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Deactivation of aldehyde dehydrogenases has been shown to be instrumental in the mechanisms of many cancers. ALDHs function in cell differentiation, proliferation, oxidation, and drug resistance. These enzymes are only one example of the many different types of dehydrogenases in the human body; their
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Aldehydes are the natural by-product of many physiological processes, as well as being the consequence of many industrial processes, put out into the environment in the form of smog and motor vehicle exhaust. Build-up of aldehydes in the brain and pericardium can be detrimental to a person's health,
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differs from NAD only in the addition of a phosphate group to the adenosine 5-membered carbon ring. The addition of the phosphate does not alter the electron transport abilities of the carrier. The phosphate group creates enough contrast between the two groups that they bind to the active site of
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The result of a dehydrogenase catalyzed reaction is not always the acquisition of a positive charge. Sometimes the substrate loses a proton. This may leave free electrons on the substrate that move into a double bond. This happens frequently when an alcohol is the substrate; when the proton on the
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O. In this case, the enzyme is taking electrons from the substrate, and using free protons to reduce the oxygen, leaving the substrate with a positive charge. The product is water, instead of hydrogen peroxide as seen above. An example of an oxidase that functions like this is complex IV in the
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These two electron carriers are easily distinguished by enzymes and participate in very different reactions. NADP mainly functions with enzymes that catalyze anabolic, or biosynthetic, pathways. Specifically, NADPH will act as a reducing agent in these reactions, resulting in NADP. These are
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Dehydrogenase enzymes transfer electrons from the substrate to an electron carrier; what carrier is used depends on the reaction taking place. Common electron acceptors used by this subclass are NAD, FAD, and NADP. Electron carriers are reduced in this process and considered oxidizers of the
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The double-bonded nitrogen atoms in FAD make it a good acceptor in taking two hydrogen atoms from a substrate. Because it takes two atoms rather than one, FAD is often involved when a double bond is formed in the newly oxidized substrate. FAD is unique because it is reduced by two electrons
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This would be considered an oxidation of the substrate, in which the substrate either loses hydrogen atoms or gains an oxygen atom (from water). The name "dehydrogenase" is based on the idea that it facilitates the removal (de-) of hydrogen (-hydrogen-) and is an enzyme (-ase). Dehydrogenase
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A represents the substrate that will be oxidized, while B is the hydride acceptor. Note how when the hydride is transferred from A to B, the A has taken on a positive charge; this is because the enzyme has taken two electrons from the substrate in order to reduce the acceptor to BH.
352:, or flavin adenine dinucleotide, is a prosthetic group (a non-polypeptide unit bound to a protein that is required for function) that consists of an adenine nucleotide and a flavin mononucleotide. FAD is a unique electron acceptor. Its fully reduced form is FADH 405:
symptoms) if not broken down quickly enough, another reason why those with acetaldehyde DH deficiencies have bad reactions to alcohol. Importantly, a lack of this enzyme has been linked to an increase in the risk of myocardial
587:"Enzyme Nomenclature: Recommendations of the Nomenclature Committee of the International Union of Biochemistry and Molecular Biology on the Nomenclature and Classification of Enzymes by the Reactions they Catalyse" 566:
pointed out that the oxidized form of NAD is negatively charged, and that NAD is an inappropriate symbol for an anion However, NAD and, similarly, NADP remain in almost universal use and alternatives such as
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In the above case, the dehydrogenase has transferred a hydride while releasing a proton, H, but dehydrogenases can also transfer two hydrogens, using FAD as an electron acceptor. This would be depicted as
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oxygen leaves, the free electrons on the oxygen will be used to create a double bond, as seen in the oxidation of ethanol to acetaldehyde carried out by alcohol dehydrogenase in the image on the right.
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are easily distinguishable if one considers the electron acceptor. An oxidase will remove electrons from a substrate as well, but only uses oxygen as its electron acceptor. One such reaction is: AH
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van den Hoogen, Christel; van der Horst, Geertje; Cheung, Henry; Buijs, Jeroen T.; Lippitt, Jenny M.; Guzmán-Ramírez, Natalia; Hamdy, Freddie C.; Eaton, Colby L.; Thalmann, George N. (2010-06-15).
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wide array of functions, and the impact that their deactivation or mutations has upon crucial cell processes underscores the importance of all dehydrogenases in maintaining body homeostasis.
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is the electron acceptor. The systematic name of an oxidoreductase is "donor:acceptor oxidoreductase", but, when possible, it is more conveniently named as "donor dehydrogenase".
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Oxidoreductases, enzymes that catalyze oxidation-reduction reactions, constitute Class EC 1 of the IUBMB classification of enzyme-catalyzed reactions. Any of these may be called
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reactions come most commonly in two forms: the transfer of a hydride and release of a proton (often with water as a second reactant), and the transfer of two hydrogens.
309:, that break down energy molecules to produce ATP. The ratio of NAD to NADH is kept very high in the cell, keeping it readily available to act as an oxidizing agent. 150:
to the substrate and a proton to the environment. The net result on the substrate is the addition of one oxygen atom. This is seen for example in the oxidation of
810: 50:. Like all catalysts, they catalyze reverse as well as forward reactions, and in some cases this has physiological significance: for example, 325: 174:
Reaction catalyzed by succinate dehydrogenase, note the double bond formed between the two central carbons when two hydrogens are removed
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Ying, Weihai (2008-02-01). "NAD+/NADH and NADP+/NADPH in cellular functions and cell death: regulation and biological consequences".
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The distinction between the subclasses of oxidoreductases that catalyze oxidation reactions lies in their electron acceptors.
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Considering how prevalent aldehydes are, there must be an enzyme to facilitate their oxidation to a less volatile compound.
1096:"High aldehyde dehydrogenase activity identifies tumor-initiating and metastasis-initiating cells in human prostate cancer" 356:(known as the hydroquinone form), but FAD can also be partially oxidized as FADH by either reducing FAD or oxidizing FADH 1160: 668: 527: 484: 294: 106:
Dehydrogenases oxidize a substrate by transferring hydrogen to an electron acceptor, common electron acceptors being
32: 437: 187:. A double bond is normally formed in between the two atoms that the hydrogens were taken from, as in the case of 1316: 349: 111: 43: 134:
Alcohol dehydrogenase oxidizes ethanol, with the help of the electron carrier NAD, yielding acetaldehyde
1431: 1069: 427: 159: 1417: 1404: 1391: 1378: 1365: 1352: 1339: 1301: 488: 191:. The two hydrogens have been transferred to the carrier or the other product, with their electrons. 459:(used to convert NADH back to NAD in anaerobic glycolysis, and in the back reaction to produce NADH) 1461: 1311: 1265: 1208: 818: 517: 243: 1213: 1030:"Population genetic studies on aldehyde dehydrogenase isozyme deficiency and alcohol sensitivity" 684:
Yoshikawa, Shinya; Shimada, Atsuhiro (2015-01-20). "Reaction Mechanism of Cytochrome c Oxidase".
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Sometimes a dehydrogenase catalyzed reaction will look like this: AH + B ↔ A + BH when a
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The mechanism of an aldehyde dehydrogenase, note the use of NAD as an electron acceptor.
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Reaction catalyzed by an oxidase, note the reduction of oxygen as the electron acceptor
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Another possibility is that a water molecule will enter the reaction, contributing a
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in animals, but in yeast it catalyzes the production of ethanol from acetaldehyde.
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as they can form adducts with important molecules and cause their inactivation.
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is also used when the physiological emphasis on reduction of the substrate, and
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two protons, as opposed to both NAD and NADP, which only take one proton.
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different enzymes, generally catalyzing different types of reactions.
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Note that oxidases typically transfer the equivalent of dihydrogen (H
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that oxidizes a substrate by reducing an electron acceptor, usually
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Chen, Che-Hong; Sun, Lihan; Mochly-Rosen, Daria (2010-10-01).
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Sometimes an oxidase reaction will look like this: 4A + 4H + O
1373: 559: 107: 257:(another subclass of oxidoreductases) will use a peroxide (H 973:"Mitochondrial aldehyde dehydrogenase and cardiac diseases" 659:
Voet, Donald; Voet, Judith G.; Pratt, Charlotte W. (2016).
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Rivlin, Richard S. (1970-08-27). "Riboflavin Metabolism".
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Fundamentals of Biochemistry: Life at the Molecular Level
841:"Sequence-structure analysis of FAD-containing proteins" 194: 341: 1429: 970: 360:. Dehydrogenases typically fully reduce FAD to FADH 265:) as the electron acceptor, rather than an oxygen. 305:NAD is mostly used in catabolic pathways, such as 562:panel on biochemical thermodynamics convened by 286:that are often referred to as "redox cofactors." 1453: 683: 630:"Definitions of Oxidation and Reduction (Redox)" 253:), and the acceptor is a dioxygen. Similarly, a 481:molecule, and is attached to the CoA coenzyme.) 723: 1154: 1027: 658: 165: 119:Transferring a hydride and releasing a proton 838: 724:Alberts, B; Johnson, A; et al. (2002). 316:Nicotinamide Adenine Dinucleotide Phosphate 1161: 1147: 839:Dym, Orly; Eisenberg, David (2001-09-01). 380: 301:Reduction of NAD: NAD + 2H + 2e ↔ NADH + H 102:A reaction catalyzed by a reductase enzyme 1111: 1045: 1004: 872: 495:glyceraldehyde-3-phosphate dehydrogenase 384: 340: 311: 272: 201: 169: 129: 97: 65: 1454: 895: 93: 1142: 966: 964: 627: 268: 805: 803: 755: 751: 749: 747: 719: 717: 715: 654: 652: 650: 600: 581: 579: 577: 195:Identifying a dehydrogenase reaction 364:. The production of FADH is rare. 13: 961: 758:Antioxidants & Redox Signaling 14: 1473: 811:"The physiological role of NADPH" 800: 744: 712: 663:(5th ed.). New York: Wiley. 647: 621: 574: 528:alpha-ketoglutarate dehydrogenase 485:glucose-6-phosphate dehydrogenase 282:substrate. Electron carriers are 277:Nicotinamide Adenine Dinucleotide 1439: 1028:Goedde, HW; Agarwal, DP (1983). 465:(A common enzyme that feeds the 438:Delta12-fatty acid dehydrogenase 421: 1087: 1062: 1021: 932: 898:New England Journal of Medicine 889: 832: 677: 571:have been very little adopted. 552: 1: 1113:10.1158/0008-5472.CAN-09-3806 730:. New York: Garland Science. 727:Molecular Biology of the Cell 546: 445:(an enzyme that can convert 7: 1168: 910:10.1056/NEJM197008272830906 375: 345:Flavin Adenine Dinucleotide 54:catalyzes the oxidation of 10: 1478: 428:acetaldehyde dehydrogenase 242:Electron Transport Chain ( 166:Transferring two hydrogens 160:acetaldehyde dehydrogenase 27:belonging to the group of 1325: 1317:Michaelis–Menten kinetics 1289: 1258: 1227: 1176: 489:pentose phosphate pathway 1209:Diffusion-limited enzyme 940:"blobs.org - Metabolism" 518:isocitrate dehydrogenase 320: 977:Cardiovascular Research 534:succinate dehydrogenase 520:(uses NAD, also has an 443:glutamate dehydrogenase 399:Aldehyde dehydrogenases 381:Biological implications 289: 189:succinate dehydrogenase 505:sorbitol dehydrogenase 463:pyruvate dehydrogenase 390: 346: 336: 317: 303: 278: 207: 175: 135: 103: 1302:Eadie–Hofstee diagram 1235:Allosteric regulation 770:10.1089/ars.2007.1672 457:lactate dehydrogenase 433:alcohol dehydrogenase 388: 344: 315: 299: 276: 205: 173: 133: 101: 52:alcohol dehydrogenase 1312:Lineweaver–Burk plot 1070:"How Hangovers Work" 540:malate dehydrogenase 66:IUBMB Classification 815:watcut.uwaterloo.ca 628:Clark, Jim (2002). 94:Reactions catalyzed 1271:Enzyme superfamily 1204:Enzyme promiscuity 989:10.1093/cvr/cvq192 491:, producing NADPH) 391: 347: 318: 279: 269:Electron acceptors 210:Dehydrogenase and 208: 176: 136: 104: 1427: 1426: 1106:(12): 5163–5173. 737:978-0-8153-3218-3 698:10.1021/cr500266a 487:(involved in the 1469: 1444: 1443: 1435: 1307:Hanes–Woolf plot 1250:Enzyme activator 1245:Enzyme inhibitor 1219:Enzyme catalysis 1163: 1156: 1149: 1140: 1139: 1134: 1133: 1115: 1091: 1085: 1084: 1082: 1081: 1066: 1060: 1059: 1049: 1025: 1019: 1018: 1008: 968: 959: 958: 956: 955: 946:. Archived from 936: 930: 929: 893: 887: 886: 876: 857:10.1110/ps.12801 851:(9): 1712–1728. 836: 830: 829: 827: 826: 817:. Archived from 807: 798: 797: 753: 742: 741: 721: 710: 709: 692:(4): 1936–1989. 686:Chemical Reviews 681: 675: 674: 656: 645: 644: 642: 640: 625: 619: 618: 616: 614: 604: 598: 597: 595: 593: 583: 572: 556: 453:and vice versa). 127:is transferred. 16:Class of enzymes 1477: 1476: 1472: 1471: 1470: 1468: 1467: 1466: 1462:Oxidoreductases 1452: 1451: 1450: 1438: 1430: 1428: 1423: 1335:Oxidoreductases 1321: 1297:Enzyme kinetics 1285: 1281:List of enzymes 1254: 1223: 1194:Catalytic triad 1172: 1167: 1137: 1100:Cancer Research 1092: 1088: 1079: 1077: 1068: 1067: 1063: 1026: 1022: 969: 962: 953: 951: 938: 937: 933: 894: 890: 845:Protein Science 837: 833: 824: 822: 809: 808: 801: 754: 745: 738: 722: 713: 682: 678: 671: 657: 648: 638: 636: 626: 622: 612: 610: 606: 605: 601: 591: 589: 585: 584: 575: 570: 557: 553: 549: 524:that uses NADP) 424: 383: 378: 363: 359: 355: 339: 323: 292: 271: 264: 260: 252: 240: 236: 229: 225: 221: 217: 197: 186: 182: 168: 121: 96: 89: 68: 29:oxidoreductases 17: 12: 11: 5: 1475: 1465: 1464: 1449: 1448: 1425: 1424: 1422: 1421: 1408: 1395: 1382: 1369: 1356: 1343: 1329: 1327: 1323: 1322: 1320: 1319: 1314: 1309: 1304: 1299: 1293: 1291: 1287: 1286: 1284: 1283: 1278: 1273: 1268: 1262: 1260: 1259:Classification 1256: 1255: 1253: 1252: 1247: 1242: 1237: 1231: 1229: 1225: 1224: 1222: 1221: 1216: 1211: 1206: 1201: 1196: 1191: 1186: 1180: 1178: 1174: 1173: 1166: 1165: 1158: 1151: 1143: 1136: 1135: 1086: 1061: 1034:Am J Hum Genet 1020: 960: 931: 904:(9): 463–472. 888: 831: 799: 764:(2): 179–206. 743: 736: 711: 676: 669: 646: 620: 599: 573: 568: 564:Robert Alberty 550: 548: 545: 544: 543: 537: 531: 525: 508: 507: 502: 492: 482: 479:carbon dioxide 469:by converting 460: 454: 440: 435: 430: 423: 420: 382: 379: 377: 374: 361: 357: 353: 338: 335: 322: 319: 291: 288: 270: 267: 262: 258: 250: 238: 234: 227: 223: 219: 215: 196: 193: 184: 180: 167: 164: 120: 117: 95: 92: 87: 72:dehydrogenases 67: 64: 15: 9: 6: 4: 3: 2: 1474: 1463: 1460: 1459: 1457: 1447: 1442: 1437: 1436: 1433: 1419: 1415: 1414: 1409: 1406: 1402: 1401: 1396: 1393: 1389: 1388: 1383: 1380: 1376: 1375: 1370: 1367: 1363: 1362: 1357: 1354: 1350: 1349: 1344: 1341: 1337: 1336: 1331: 1330: 1328: 1324: 1318: 1315: 1313: 1310: 1308: 1305: 1303: 1300: 1298: 1295: 1294: 1292: 1288: 1282: 1279: 1277: 1276:Enzyme family 1274: 1272: 1269: 1267: 1264: 1263: 1261: 1257: 1251: 1248: 1246: 1243: 1241: 1240:Cooperativity 1238: 1236: 1233: 1232: 1230: 1226: 1220: 1217: 1215: 1212: 1210: 1207: 1205: 1202: 1200: 1199:Oxyanion hole 1197: 1195: 1192: 1190: 1187: 1185: 1182: 1181: 1179: 1175: 1171: 1164: 1159: 1157: 1152: 1150: 1145: 1144: 1141: 1131: 1127: 1123: 1119: 1114: 1109: 1105: 1101: 1097: 1090: 1075: 1074:HowStuffWorks 1071: 1065: 1057: 1053: 1048: 1043: 1040:(4): 769–72. 1039: 1035: 1031: 1024: 1016: 1012: 1007: 1002: 998: 994: 990: 986: 982: 978: 974: 967: 965: 950:on 2016-02-01 949: 945: 944:www.blobs.org 941: 935: 927: 923: 919: 915: 911: 907: 903: 899: 892: 884: 880: 875: 870: 866: 862: 858: 854: 850: 846: 842: 835: 821:on 2016-03-06 820: 816: 812: 806: 804: 795: 791: 787: 783: 779: 775: 771: 767: 763: 759: 752: 750: 748: 739: 733: 729: 728: 720: 718: 716: 707: 703: 699: 695: 691: 687: 680: 672: 670:9781118918401 666: 662: 655: 653: 651: 635: 631: 624: 609: 603: 588: 582: 580: 578: 565: 561: 555: 551: 541: 538: 535: 532: 529: 526: 523: 519: 516: 515: 514: 512: 506: 503: 500: 497:(involved in 496: 493: 490: 486: 483: 480: 476: 472: 468: 464: 461: 458: 455: 452: 451:Ketoglutarate 448: 444: 441: 439: 436: 434: 431: 429: 426: 425: 422:More examples 419: 415: 413: 409: 404: 400: 395: 387: 373: 371: 365: 351: 343: 334: 330: 327: 314: 310: 308: 302: 298: 296: 287: 285: 275: 266: 256: 247: 245: 231: 213: 204: 200: 192: 190: 172: 163: 161: 157: 153: 149: 148:hydroxide ion 144: 140: 132: 128: 126: 116: 113: 109: 100: 91: 85: 81: 77: 73: 63: 61: 57: 53: 49: 45: 41: 38: 34: 30: 26: 22: 21:dehydrogenase 1413:Translocases 1410: 1397: 1384: 1371: 1358: 1348:Transferases 1345: 1332: 1189:Binding site 1103: 1099: 1089: 1078:. Retrieved 1076:. 2004-10-12 1073: 1064: 1037: 1033: 1023: 983:(1): 51–57. 980: 976: 952:. Retrieved 948:the original 943: 934: 901: 897: 891: 848: 844: 834: 823:. Retrieved 819:the original 814: 761: 757: 726: 689: 685: 679: 660: 639:February 14, 637:. Retrieved 633: 623: 611:. Retrieved 602: 590:. Retrieved 554: 509: 416: 396: 392: 369: 366: 348: 331: 324: 304: 300: 293: 280: 248: 232: 209: 198: 183:+ B ↔ A + BH 177: 152:acetaldehyde 145: 141: 137: 122: 105: 83: 69: 60:acetaldehyde 20: 18: 1184:Active site 501:, uses NAD) 156:acetic acid 1387:Isomerases 1361:Hydrolases 1228:Regulation 1080:2016-03-06 954:2016-03-01 825:2016-03-06 547:References 542:(uses NAD) 536:(uses FAD) 530:(uses NAD) 513:examples: 499:glycolysis 475:acetyl CoA 408:infarction 307:glycolysis 255:peroxidase 1266:EC number 1122:1538-7445 997:0008-6363 918:0028-4793 865:1469-896X 778:1523-0864 634:Chemguide 511:TCA cycle 467:TCA Cycle 447:glutamate 412:ischaemia 284:coenzymes 237:↔ 4A + 2H 76:reductase 1456:Category 1290:Kinetics 1214:Cofactor 1177:Activity 1130:20516116 1015:20558439 883:11514662 794:42000527 786:18020963 706:25603498 613:30 March 592:29 March 569:oxidized 471:pyruvate 403:hangover 376:Examples 82:is used 42:such as 40:coenzyme 33:NAD/NADP 1446:Biology 1400:Ligases 1170:Enzymes 1056:6881146 1047:1685745 1006:2936126 926:4915004 874:2253189 522:isozyme 222:↔ A + H 212:oxidase 125:hydride 80:oxidase 56:ethanol 1432:Portal 1374:Lyases 1128:  1120:  1054:  1044:  1013:  1003:  995:  924:  916:  881:  871:  863:  792:  784:  776:  734:  704:  667:  86:when O 37:flavin 25:enzyme 23:is an 1326:Types 790:S2CID 560:IUPAC 449:to α- 35:or a 1418:list 1411:EC7 1405:list 1398:EC6 1392:list 1385:EC5 1379:list 1372:EC4 1366:list 1359:EC3 1353:list 1346:EC2 1340:list 1333:EC1 1126:PMID 1118:ISSN 1052:PMID 1011:PMID 993:ISSN 922:PMID 914:ISSN 879:PMID 861:ISSN 782:PMID 774:ISSN 732:ISBN 702:PMID 665:ISBN 641:2016 615:2021 594:2021 326:NADP 321:NADP 112:FAD. 84:only 1108:doi 1042:PMC 1001:PMC 985:doi 906:doi 902:283 869:PMC 853:doi 766:doi 694:doi 690:115 567:NAD 558:An 473:to 370:and 350:FAD 337:FAD 295:NAD 290:NAD 246:). 244:ETC 218:+ O 158:by 154:to 110:or 108:NAD 58:to 48:FMN 46:or 44:FAD 1458:: 1124:. 1116:. 1104:70 1102:. 1098:. 1072:. 1050:. 1038:35 1036:. 1032:. 1009:. 999:. 991:. 981:88 979:. 975:. 963:^ 942:. 920:. 912:. 900:. 877:. 867:. 859:. 849:10 847:. 843:. 813:. 802:^ 788:. 780:. 772:. 762:10 760:. 746:^ 714:^ 700:. 688:. 649:^ 632:. 576:^ 414:. 230:. 179:AH 19:A 1434:: 1420:) 1416:( 1407:) 1403:( 1394:) 1390:( 1381:) 1377:( 1368:) 1364:( 1355:) 1351:( 1342:) 1338:( 1162:e 1155:t 1148:v 1132:. 1110:: 1083:. 1058:. 1017:. 987:: 957:. 928:. 908:: 885:. 855:: 828:. 796:. 768:: 740:. 708:. 696:: 673:. 643:. 617:. 596:. 362:2 358:2 354:2 263:2 261:O 259:2 251:2 239:2 235:2 228:2 226:O 224:2 220:2 216:2 185:2 181:2 88:2

Index

enzyme
oxidoreductases
NAD/NADP
flavin
coenzyme
FAD
FMN
alcohol dehydrogenase
ethanol
acetaldehyde
dehydrogenases
reductase
oxidase

NAD
FAD.
hydride

hydroxide ion
acetaldehyde
acetic acid
acetaldehyde dehydrogenase

succinate dehydrogenase

oxidase
ETC
peroxidase

coenzymes

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