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Edwin W. Taylor

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microtubule-kinesin occurred after the hydrolysis step, in comparison to the dissociation occurring before hydrolysis in the actomyosin mechanism. This sparked a realization in Taylor that the dissimilarities shared between the two mechanisms may indicate that a different step in the cycle may be coupled to force generation. He found the dissociation of phosphate in the actomyosin mechanism to be a slow rate-limiting step, while this step occurred relatively quickly for the kinesin-microtubule mechanism. The limiting rate is governed by the rate that ADP in the hydrolysis cycle dissociates. Additionally, Taylor and Richard Lymn concluded in 1971 that actomyosin ATPase’s slow rate-limiting step could be attributed to the rate-limiting dissociation of the products, ADP, and phosphate from the enzyme. This led to the idea that actin could be a potential influence in the rate of product dissociation instead of the hydrolytic step in its activation mechanism. Muscle myosin and kinesin have two head domains. As ATP binds to one head domain, it initiates the release of ADP from the second head domain in the hydrolysis cycle.
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kinesin with microtubules, Taylor was eager to discover the kinetic mechanism that dictated the structural changes responsible for force and motion. His work in the laboratory not only led to his discovery of tubulin, the protein subunit of microtubules, but it also developed the first kinetic model explaining how these molecular motors could convert chemical energy into mechanical force. To best understand the contraction cycle, the model was derived from striated muscle to study the kinetic mechanism of the actomyosin ATPase cycle. The main focus was to determine how the hydrolysis of ATP by enzymes could lead to the generation of force and motion. Nevertheless, a concern for Taylor stimulated from the very different reaction pathways that myosin and kinesin followed, considering the idea that these two motors shared very important structural features.
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these techniques actually was instigated by Taylor and B. Finlayson in 1969 through the proton release. In 1987, S. Rosenfeld and Taylor evaluated the regulatory mechanism of actin-sub fragment 1 nucleoside triphosphate. They were interested in the influence that calcium binding to regulated actin has on ATPase cycle rates. For the hydrolysis step, there was only a small change in the presence of calcium. On the other hand, for the dissociation of the ligand and products, the presence of calcium for ATP led to an increased rate by 10-20-fold. These results showed Rosenfeld and Taylor that the particular steps in the ATPase cycle that were most impacted by the presence of calcium were the transition steps, followed by the dissociation of the ligand from the active site.
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his focus on muscle actomyosin in order to fully understand the consequences in mechano-chemical coupling. By 1954, Hugh Huxley and Jean Hanson revealed their sliding filament model, proposing that through the contraction of a myosin molecule branch, myosin-actin linkages can pull the actin filament. The structural model provided clarity in contractility, but Taylor and other researchers remained unsure of the role of ATP hydrolysis. Aware that ATP was hydrolyzed in the polymerization of actin, Taylor was confused on whether it dissociated actomyosin through contraction or relaxation. In 1979, Taylor and his research partners demonstrated that the binding of myosin to actin, following the release of a phosphate, produced a significant reduction in free energy.
286:, myosin with actin and kinesin with microtubules, to discover the kinetic mechanism that dictates the structural changes responsible for force and motion. This led to his discovery of tubulin, the protein subunit of microtubules, and to the first kinetic model explaining how these molecular motors convert chemical energy into mechanical force in striated muscle. In the actomyosin ATPase cycle, the hydrolysis of ATP by enzymes leads to the generation of force and motion. Taylor also has studied the very different reaction pathways that myosin and kinesin follow, showing that these two motors shared important structural features. 321:
filament regulation by transient kinetics and equilibrium binding: Is there a conflict?”, Taylor, along with David H. Heely and Howard D. White conduct research and provide more clarity to the issue. In their research, they confirm that the thin filament activity is primarily influenced by the rate of inorganic phosphate dissociation. In addition, they observed that the regulatory focal point of the thin filament, or the step that releases the inorganic phosphate, is dependent upon myosin’s conformation, as well as the bonded state of the thin filament.
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activity had a significant correlation with sources abundant in microtubules, but an absence in correlation with mitotic activity or motility. Microtubules conduct the mitotic spindle, constitute the 9 + 2 assortment of filaments in the cilia and sperm tails, and participate in the majority of neuronal processes. As Taylor concluded the high colchicine binding activity in these four sources, the results made sense to him, considering microtubules are the only structure shared amongst the four.
240:, where he began his graduate studies in Biophysics and discovered an interest to research the mechanism of mitosis. His Ph.D. dissertation focused on measuring the rates of mitotic processes. He was able to assess spindles and their rate of growth through the application of polarized light microscopy. By 1957, he acquired his Ph.D. in Biophysics from the University of Chicago. 313:
of cells. Results of their study showed that bundling in filopodial filaments requires the dephosphorylation of fascin, which can also initiate high-affinity actin binding in the filopodia. In order for filopodial filaments to form, the process depends on the phosphorylation or dephosphorylation cycles that serve as the primary indicators of fascin inactivity or activity.
293:. Its high affinity for binding to cells suggested the potential of isolating a complex of colchicine with its binding protein. Taylor and graduate student, Gary Borisy, discovered colchicine was indeed specific and its highest binding activity was presented in dividing cells, mitotic apparatus, cilia, sperm tails, and brain tissue. 300:
Using sea urchin eggs, Taylor and Borisy directed another experiment to further demonstrate that the location of binding sites resides in the mitotic apparatus. When the spindles were extracted from the mitotic apparatus and suspended in treatment of low ionic strength, the microtubules disintegrated
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writes about the honoring of Taylor at the National Institutes of Health in Bethesda, Maryland, with a science symposium. The symposium is titled as "Myosin, Microtubules and Motion" to acknowledge Taylor's contributions and efforts towards these particular fields. On May 1, 2001, Taylor was elected
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Taylor and fellow corresponding authors, Yvonne S. Aratyn, Thomas E. Schaus, and Gary G. Borisy, published the “Intrinsic Dynamic Behavior of Fascin in Filopodia” in 2007. Fascin is actin’s primary cross-linking protein in filopodial filaments, which are cellular projections that aid in the motility
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Taylor focused a significant amount of his research on the molecular mechanisms regulating the movement of cells. His findings have contributed to a better understanding of the chemical events involved in muscle contraction cycles. Through the investigation of molecular motors, myosin with actin and
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After the introduction of tubulin, Taylor was conflicted on what moves the chromosomes and what caused the motile system to function. In the 1960s, myosin and dynein were the only structures potentially responsible. However, only dynein was able to interact with the microtubules. Taylor prioritized
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In 1967, Borisy and Taylor published their work, “The Mechanism of Action of Colchicine. Binding of Colchincine-3H to Cellular Protein.” The goal of their project was to demonstrate that the 6S colchicine-binding protein is the subunit protein of microtubules. They observed that colchicine-binding
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Even twelve years later, what continued to remain misunderstood were the varying degrees of thin filament activation between pre- or post-power stroke myosin. Myosin’s kinetic properties had remained vague, and many techniques had been employed to further investigate what was left unknown. One of
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The actomyosin ATP hydrolysis cycle in muscle motility was intended to show a direct correlation in the regulation of ATP hydrolysis and the power stroke. However, experiments that exhibited an absence of ATP hydrolysis could not explain regulation. In “Investigation into the mechanism of thin
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Once kinesin, a motor protein and anterograde transporter of vesicles in axons, was discovered, Taylor devoted his time to researching the kinetic mechanism. In 1995, Taylor and Yong-Ze Ma published, “Mechanism of Microtubule Kinesin ATPase”, noting that the dissociation of the K379 dimer in
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and disappeared. Under low ionic strength extraction, more than 80% of the colchicine-binding activity was removed, including the microtubules. As these conditions reduce the colchicine-binding activity, results conclude the absence of the microtubules.
270:’s laboratory at Northwestern University’s Department of Cell and Developmental Biology. While not in the laboratory, Taylor worked a half-time position as a Louis Block Professor of Molecular Genetics and Cell Biology at the University of Chicago. 212:, was not coined until 1968. In 1967 Taylor found that the action of colchicine binding to cells could be modeled by a single kind of binding sites, perhaps showing that a unique target might exist. Taylor spends his summers in 1466: 334:
Member of the National Academy of Sciences. He was elected for his crucial contributions to the biochemistry of muscle contraction. Taylor is recognized as the "father of cytoskeletal research".
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Taylor works on the molecular mechanisms regulating the movement of cells, particularly the chemical events involved in muscle contraction cycles. He investigates
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proteins with Peter Davison. He eventually returned to the University of Chicago and introduced his own laboratory. By the early 1970s, Taylor moved to the
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in 1957. In 2001 Taylor was elected to the National Academy of Sciences in Cellular and Developmental Biology and Biochemistry.
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Aratyn, Yvonne S.; Schaus, Thomas E.; Taylor, Edwin W.; Borisy, Gary G. (October 2007). Adams, Josephine (ed.).
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who was a graduate student in Taylor's lab, discovered the protein that is the building block of
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In 1952, Taylor earned his Bachelor of Arts degree in Physics and Chemistry at the
173: 98: 94: 59: 657: 496: 267: 260: 205: 201: 188:. He uncovered several molecular cell motors, including some that help certain 1013: 522:"50 years on … the discovery of tubulin continues to advance cancer treatment" 290: 158: 1380: 1331: 1308:"Hydrolysis of nucleoside triphosphates by myosin during the transient state" 1274: 1214: 1167: 1068: 1021: 964: 915: 744: 601: 547: 1206: 1292: 1232: 811: 762: 555: 1388: 1339: 1266: 1175: 1120: 1111: 1094: 1076: 982: 619: 236:
in Physical Chemistry by 1955. During this same year, Taylor attended the
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As a postdoctoral fellow, Taylor spent two years in the laboratory of
998:"Mechanism of Actomyosin Atpase and the Problem of Muscle Contractio" 197: 259:
Muscle Biophysics Unit at King’s College where he collaborated with
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create movement in non-muscle cells. In 1950, Taylor, together with
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Heeley, David H.; White, Howard D.; Taylor, Edwin W. (2019-05-06).
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Taylor’s interest in studying mitotic mechanisms led to the use of
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research. His research described the first kinetic model of how
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in 2001. Taylor received a BA in physics and chemistry from the
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Taylor, Edwin W. (February 2001). Pollard, Thomas D. (ed.).
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Members of the United States National Academy of Sciences
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Finlayson, Birdwell; Taylor, Edwin William (1969-03-01).
778:"999 E.B. Wilson Lecture: The cell as molecular machine" 634:"Milestone 6 : Nature Milestones in Cytoskeleton" 721:"E.B. Wilson Lecture: The Cell as Molecular Machine" 1191:"Intrinsic Dynamic Behavior of Fascin in Filopodia" 263:on a simple model of the muscle contraction cycle. 108: 86: 66: 55: 28: 21: 996:Taylor, Edwin W.; Trenlham, D. R. (January 1979). 1353:Rosenfeld, S. S.; Taylor, E. W. (1987-07-25). 1093:Ma, Yong-Ze; Taylor, Edwin W. (January 1997). 232:. He received a Master of Science degree from 520:Crasta, Karen; Aneja, Ritu (September 2017). 8: 939:Borisy, G. G.; Taylor, E. W. (1967-08-01). 574:Borisy, G. G.; Taylor, E. W. (1967-08-01). 1043:Ma, Y. Z.; Taylor, Edwin W. (1995-10-10). 497:"Discovery Talk: The Discovery of Tubulin" 266:In 1999, Taylor spent some of his time in 18: 1370: 1282: 1222: 1142:Lymn, R. W.; Taylor, E. W. (1971-12-07). 1110: 1045:"Mechanism of Microtubule Kinesin ATPase" 972: 923: 801: 752: 609: 591: 537: 168:Taylor has made contributions to the way 941:"The Mechanism of Action of Colchicine" 343: 858: 856: 679: 677: 1244: 1242: 1088: 1086: 885: 883: 831: 829: 827: 825: 823: 821: 714: 712: 710: 708: 706: 704: 249:Massachusetts Institute of Technology 208:, although the name of that protein, 7: 1002:CRC Critical Reviews in Biochemistry 569: 567: 565: 438: 436: 434: 409: 407: 405: 403: 378: 376: 1359:The Journal of Biological Chemistry 331:The University of Chicago Chronicle 251:, investigating the properties of 14: 890:Wells, William A. (2005-05-23). 192:to move. He also elucidated how 1462:Northwestern University faculty 1099:Journal of Biological Chemistry 1427:"National Academy of Sciences" 1: 1431:www.feinberg.northwestern.edu 1372:10.1016/S0021-9258(18)61063-4 1255:Journal of General Physiology 1195:Molecular Biology of the Cell 782:Molecular Biology of the Cell 725:Molecular Biology of the Cell 388:www.feinberg.northwestern.edu 356:www.feinberg.northwestern.edu 1482:University of Chicago alumni 1472:University of Toronto alumni 776:Taylor, EW (February 2001). 468:"Moving on transient tracks" 329:Published on March 4, 1999, 143:National Academy of Sciences 1503: 1477:McMaster University alumni 892:"The discovery of tubulin" 214:Woods Hole Research Center 1014:10.3109/10409237909102562 658:"Edwin Taylor • iBiology" 116: 79: 1487:American cell biologists 841:www.uchicagomedicine.org 526:Endocrine-Related Cancer 257:Medical Research Council 141:. He was elected to the 1207:10.1091/mbc.e07-04-0346 945:Journal of Cell Biology 896:Journal of Cell Biology 580:Journal of Cell Biology 139:Northwestern University 1407:chronicle.uchicago.edu 415:"Edwin W. Taylor, PhD" 157:in 1955, and a PhD in 1267:10.1085/jgp.201812198 1112:10.1074/jbc.272.2.724 238:University of Chicago 230:University of Toronto 163:University of Chicago 147:University of Toronto 135:developmental biology 112:University of Chicago 47:University of Chicago 33:University of Toronto 957:10.1083/jcb.34.2.535 794:10.1091/mbc.12.2.251 737:10.1091/mbc.12.2.251 593:10.1083/jcb.34.2.525 1324:10.1021/bi00831a007 1160:10.1021/bi00801a004 1061:10.1021/bi00040a040 1055:(40): 13242–13251. 908:10.1083/jcb1694fta1 539:10.1530/erc-17-0273 234:McMaster University 180:are able to change 155:McMaster University 149:in 1952; an MSc in 40:McMaster University 172:and other related 151:physical chemistry 91:Molecular Genetics 16:American biologist 1365:(21): 9984–9993. 1201:(10): 3928–3940. 1154:(25): 4617–4624. 868:www.nasonline.org 689:mgcb.uchicago.edu 448:www.nasonline.org 419:mgcb.uchicago.edu 352:"Faculty Profile" 325:Awards and honors 190:white blood cells 127:adjunct professor 120: 119: 103:Molecular Biology 81:Scientific career 71:E.B. Wilson Medal 1494: 1441: 1440: 1438: 1437: 1423: 1417: 1416: 1414: 1413: 1399: 1393: 1392: 1374: 1350: 1344: 1343: 1303: 1297: 1296: 1286: 1246: 1237: 1236: 1226: 1186: 1180: 1179: 1139: 1133: 1132: 1114: 1090: 1081: 1080: 1040: 1034: 1033: 993: 987: 986: 976: 936: 930: 929: 927: 887: 878: 877: 875: 874: 860: 851: 850: 848: 847: 833: 816: 815: 805: 773: 767: 766: 756: 716: 699: 698: 696: 695: 681: 672: 671: 669: 668: 654: 648: 647: 645: 644: 630: 624: 623: 613: 595: 571: 560: 559: 541: 517: 511: 510: 508: 507: 493: 487: 486: 484: 483: 474:. Archived from 464: 458: 457: 455: 454: 440: 429: 428: 426: 425: 411: 398: 397: 395: 394: 380: 371: 370: 368: 367: 358:. Archived from 348: 284:molecular motors 186:mechanical force 178:molecular motors 170:muscles contract 75: 51: 44: 37: 19: 1502: 1501: 1497: 1496: 1495: 1493: 1492: 1491: 1447: 1446: 1445: 1444: 1435: 1433: 1425: 1424: 1420: 1411: 1409: 1401: 1400: 1396: 1352: 1351: 1347: 1305: 1304: 1300: 1248: 1247: 1240: 1188: 1187: 1183: 1141: 1140: 1136: 1092: 1091: 1084: 1042: 1041: 1037: 995: 994: 990: 938: 937: 933: 889: 888: 881: 872: 870: 862: 861: 854: 845: 843: 835: 834: 819: 775: 774: 770: 718: 717: 702: 693: 691: 683: 682: 675: 666: 664: 656: 655: 651: 642: 640: 632: 631: 627: 573: 572: 563: 519: 518: 514: 505: 503: 495: 494: 490: 481: 479: 466: 465: 461: 452: 450: 442: 441: 432: 423: 421: 413: 412: 401: 392: 390: 382: 381: 374: 365: 363: 350: 349: 345: 340: 327: 276: 245:Francis Schmitt 226: 182:chemical energy 123:Edwin W. Taylor 101: 97: 93: 73: 49: 45: 42: 38: 35: 29:Alma mater 24: 23:Edwin W. Taylor 17: 12: 11: 5: 1500: 1498: 1490: 1489: 1484: 1479: 1474: 1469: 1464: 1459: 1449: 1448: 1443: 1442: 1418: 1394: 1345: 1318:(3): 802–810. 1298: 1261:(5): 628–634. 1238: 1181: 1134: 1105:(2): 724–730. 1082: 1035: 1008:(2): 103–164. 988: 951:(2): 535–548. 931: 879: 864:"Edwin Taylor" 852: 817: 768: 731:(2): 251–254. 700: 673: 649: 638:www.nature.com 625: 586:(2): 525–533. 561: 512: 488: 459: 444:"Edwin Taylor" 430: 399: 372: 342: 341: 339: 336: 326: 323: 275: 272: 225: 222: 118: 117: 114: 113: 110: 106: 105: 88: 84: 83: 77: 76: 68: 64: 63: 57: 56:Known for 53: 52: 30: 26: 25: 22: 15: 13: 10: 9: 6: 4: 3: 2: 1499: 1488: 1485: 1483: 1480: 1478: 1475: 1473: 1470: 1468: 1465: 1463: 1460: 1458: 1457:Living people 1455: 1454: 1452: 1432: 1428: 1422: 1419: 1408: 1404: 1398: 1395: 1390: 1386: 1382: 1378: 1373: 1368: 1364: 1360: 1356: 1349: 1346: 1341: 1337: 1333: 1329: 1325: 1321: 1317: 1313: 1309: 1302: 1299: 1294: 1290: 1285: 1280: 1276: 1272: 1268: 1264: 1260: 1256: 1252: 1245: 1243: 1239: 1234: 1230: 1225: 1220: 1216: 1212: 1208: 1204: 1200: 1196: 1192: 1185: 1182: 1177: 1173: 1169: 1165: 1161: 1157: 1153: 1149: 1145: 1138: 1135: 1130: 1126: 1122: 1118: 1113: 1108: 1104: 1100: 1096: 1089: 1087: 1083: 1078: 1074: 1070: 1066: 1062: 1058: 1054: 1050: 1046: 1039: 1036: 1031: 1027: 1023: 1019: 1015: 1011: 1007: 1003: 999: 992: 989: 984: 980: 975: 970: 966: 962: 958: 954: 950: 946: 942: 935: 932: 926: 921: 917: 913: 909: 905: 901: 897: 893: 886: 884: 880: 869: 865: 859: 857: 853: 842: 838: 832: 830: 828: 826: 824: 822: 818: 813: 809: 804: 799: 795: 791: 787: 783: 779: 772: 769: 764: 760: 755: 750: 746: 742: 738: 734: 730: 726: 722: 715: 713: 711: 709: 707: 705: 701: 690: 686: 680: 678: 674: 663: 659: 653: 650: 639: 635: 629: 626: 621: 617: 612: 607: 603: 599: 594: 589: 585: 581: 577: 570: 568: 566: 562: 557: 553: 549: 545: 540: 535: 531: 527: 523: 516: 513: 502: 498: 492: 489: 478:on 2017-02-09 477: 473: 469: 463: 460: 449: 445: 439: 437: 435: 431: 420: 416: 410: 408: 406: 404: 400: 389: 385: 379: 377: 373: 362:on 2020-07-26 361: 357: 353: 347: 344: 337: 335: 332: 324: 322: 318: 314: 310: 306: 302: 298: 294: 292: 287: 285: 280: 273: 271: 269: 264: 262: 258: 254: 253:neurofilament 250: 246: 241: 239: 235: 231: 223: 221: 219: 218:Massachusetts 215: 211: 207: 203: 199: 195: 191: 187: 183: 179: 175: 171: 166: 164: 160: 156: 152: 148: 144: 140: 136: 132: 128: 124: 115: 111: 107: 104: 100: 96: 92: 89: 85: 82: 78: 72: 69: 65: 61: 58: 54: 50:(Ph.D., 1957) 48: 41: 34: 31: 27: 20: 1434:. 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Index

University of Toronto
McMaster University
University of Chicago
Cytoskeletal
E.B. Wilson Medal
Molecular Genetics
Cell Biology
Biochemistry
Molecular Biology
adjunct professor
cell
developmental biology
Northwestern University
National Academy of Sciences
University of Toronto
physical chemistry
McMaster University
biophysics
University of Chicago
muscles contract
cytoskeletal
molecular motors
chemical energy
mechanical force
white blood cells
actin
myosin
Gary Borisy
microtubules
tubulin

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