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LexA repressor

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307:. Antibiotics such as ciprofloxacin are able to prevent the action of these molecules by attaching themselves to the gyrate–DNA complex, leading to replication fork stall and the induction of the SOS response. The expression of error-prone polymerases under the SOS response increases the basal mutation rate of bacteria. While mutations are often lethal to the cell, they can also enhance survival. In the specific case of topoisomerases, some bacteria have mutated one of their amino acids so that the ciprofloxacin can only create a weak bond to the topoisomerase. This is one of the methods that bacteria use to become 1956: 1982: 42: 311:
to antibiotics. Ciprofloxacin treatment can therefore potentially lead to the generation of mutations that may render bacteria resistant to ciprofloxacin. In addition, ciprofloxacin has also been shown to induce via the SOS response dissemination of
236:, which senses DNA damage at stalled replication forks, forming monofilaments and acquiring an active conformation capable of binding to LexA and causing LexA to cleave itself, in a process called 1168: 1028: 154: 768: 1889: 251:
domain. The dimerization domain binds to other LexA polypeptides to form dumbbell shaped dimers. The DNA-binding domain is a variant form of the
1863: 102: 1524: 1579: 761: 1832: 1763: 540:"Antibiotic-induced SOS response promotes horizontal dissemination of pathogenicity island-encoded virulence factors in staphylococci" 1233: 473: 1847: 579:
Beaber JW, Hochhut B, Waldor MK (January 2004). "SOS response promotes horizontal dissemination of antibiotic resistance genes".
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Impaired LexA proteolysis has been shown to interfere with ciprofloxacin resistance. This offers potential for
327:, potentially increasing the likelihood of acquisition and dissemination of antibiotic resistance by bacteria. 199: 162: 1286: 1178: 1143: 1138: 1858: 1768: 1563: 1624: 1307: 1226: 1133: 983: 317: 308: 1379: 158: 1549: 1123: 643: 588: 335: 115: 2022: 1959: 1646: 1510: 1343: 1023: 1013: 830: 825: 331: 2017: 1276: 667: 612: 399: 244: 491:"Solution structure of the LexA repressor DNA binding domain determined by 1H NMR spectroscopy" 1842: 1005: 718: 659: 604: 561: 520: 469: 443: 391: 287:. Of potential clinical interest is the induction of the SOS response by antibiotics, such as 149: 630:
Guerin E, Cambray G, Sanchez-Alberola N, Campoy S, Erill I, Da Re S, et al. (May 2009).
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with strategies aimed at interfering with the action of LexA, either directly or via RecA.
141: 1558: 1369: 1353: 1266: 1038: 1033: 805: 781: 304: 647: 592: 386: 361: 1986: 1407: 1348: 713: 686: 506: 210: 515: 490: 1996: 1870: 1691: 1312: 1271: 1183: 1056: 1045: 777: 556: 539: 439: 292: 288: 280: 256: 248: 221: 107: 671: 489:
Fogh RH, Ottleben G, RĂĽterjans H, Schnarr M, Boelens R, Kaptein R (September 1994).
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Cirz RT, Chin JK, Andes DR, de Crécy-Lagard V, Craig WA, Romesberg FE (June 2005).
616: 206: 137: 468:(Fifth ed.). Hoboken, NJ : Washington, D.C: John Wiley & Sons, Inc. 83: 742: 703: 95: 1485: 1420: 1256: 1198: 1193: 842: 237: 1981: 1773: 1594: 1541: 1533: 1160: 1102: 883: 878: 858: 424:"Aeons of distress: an evolutionary perspective on the bacterial SOS response" 377: 296: 276: 260: 214: 687:"Inhibition of mutation and combating the evolution of antibiotic resistance" 1459: 1433: 1188: 1174: 993: 873: 863: 655: 324: 267:
upstream of SOS response genes until DNA damage stimulates autoproteolysis.
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Ubeda C, Maiques E, Knecht E, Lasa I, Novick RP, Penadés JR (May 2005).
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Henkin TM, Peters JE (2020). "DNA Repair and Mutagenesis".
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This article incorporates text from the public domain
1970: 194:(Locus for X-ray sensitivity A) is a transcriptional 1815: 1794: 1722: 1667: 1540: 1398: 1362: 1331: 1300: 1249: 1111: 1088: 1054: 1004: 841: 796: 466:
Snyder and Champness molecular genetics of bacteria
168: 148: 130: 125: 101: 89: 76: 64: 56: 51: 34: 632:"The SOS response controls integron recombination" 360:Butala M, Ĺ˝gur-Bertok D, Busby SJ (January 2009). 362:"The bacterial LexA transcriptional repressor" 1518: 1227: 762: 459: 457: 275:DNA damage can be inflicted by the action of 8: 422:Erill I, Campoy S, BarbĂ© J (November 2007). 355: 353: 351: 243:LexA polypeptides contains a two domains: a 320:determinants, as well as the activation of 263:of the protein. This domain is bound to an 1525: 1511: 1503: 1234: 1220: 1212: 769: 755: 747: 122: 40: 712: 702: 555: 514: 385: 1977: 347: 209:genes coding primarily for error-prone 782:serine proteases/serine endopeptidases 417: 415: 413: 31: 7: 366:Cellular and Molecular Life Sciences 1833:Proliferating Cell Nuclear Antigen 1764:Microhomology-mediated end joining 507:10.1002/j.1460-2075.1994.tb06709.x 25: 1980: 1955: 1954: 1848:Meiotic recombination checkpoint 557:10.1111/j.1365-2958.2005.04584.x 440:10.1111/j.1574-6976.2007.00082.x 259:, and is usually located at the 230:two-component regulatory system 1: 994:Urinary plasminogen activator 126:Available protein structures: 1730:Transcription-coupled repair 989:Tissue plasminogen activator 704:10.1371/journal.pbio.0030176 2039: 1752:Non-homologous end joining 1576:Nucleotide excision repair 1569:Poly ADP ribose polymerase 732: 1950: 1390:Michaelis–Menten kinetics 1080:Proteinase 3/Myeloblastin 428:FEMS Microbiology Reviews 378:10.1007/s00018-008-8378-6 121: 39: 1747:Homology directed repair 1669:Homologous recombination 1282:Diffusion-limited enzyme 656:10.1126/science.1172914 224:inhibitors. LexA forms 35:LexA DNA binding domain 1769:Postreplication repair 1564:Uracil-DNA glycosylase 1134:Proprotein convertases 544:Molecular Microbiology 1375:Eadie–Hofstee diagram 1308:Allosteric regulation 984:Plasminogen activator 318:antibiotic resistance 271:Clinical significance 1875:core protein complex 1550:Base excision repair 1385:Lineweaver–Burk plot 1124:Prolyl endopeptidase 1647:DNA mismatch repair 648:2009Sci...324.1034G 601:10.1038/nature02241 593:2004Natur.427...72B 332:combination therapy 291:. Bacteria require 27:Prokaryotic protein 2008:Bacterial proteins 1344:Enzyme superfamily 1277:Enzyme promiscuity 245:DNA-binding domain 1968: 1967: 1843:Adaptive response 1500: 1499: 1209: 1208: 1006:Complement system 798:Digestive enzymes 501:(17): 3936–3944. 314:virulence factors 205:) that represses 184: 183: 180: 179: 175:structure summary 46:lexa s119a mutant 16:(Redirected from 2030: 1985: 1984: 1976: 1958: 1957: 1527: 1520: 1513: 1504: 1380:Hanes–Woolf plot 1323:Enzyme activator 1318:Enzyme inhibitor 1292:Enzyme catalysis 1236: 1229: 1222: 1213: 771: 764: 757: 748: 727: 726: 716: 706: 682: 676: 675: 627: 621: 620: 576: 570: 569: 559: 535: 529: 528: 518: 495:The EMBO Journal 486: 480: 479: 461: 452: 451: 419: 408: 407: 389: 357: 301:topoisomerase IV 253:helix-turn-helix 123: 44: 32: 21: 2038: 2037: 2033: 2032: 2031: 2029: 2028: 2027: 2013:DNA replication 2003:Protein domains 1993: 1992: 1991: 1979: 1971: 1969: 1964: 1946: 1816:Other/ungrouped 1811: 1790: 1718: 1663: 1559:DNA glycosylase 1542:Excision repair 1536: 1531: 1501: 1496: 1408:Oxidoreductases 1394: 1370:Enzyme kinetics 1358: 1354:List of enzymes 1327: 1296: 1267:Catalytic triad 1245: 1240: 1210: 1205: 1107: 1084: 1050: 1000: 837: 806:Enteropeptidase 792: 775: 745: 731: 730: 684: 683: 679: 629: 628: 624: 587:(6969): 72–74. 578: 577: 573: 537: 536: 532: 488: 487: 483: 476: 463: 462: 455: 421: 420: 411: 359: 358: 349: 344: 305:DNA replication 273: 238:autoproteolysis 211:DNA polymerases 47: 28: 23: 22: 15: 12: 11: 5: 2036: 2034: 2026: 2025: 2020: 2015: 2010: 2005: 1995: 1994: 1990: 1989: 1966: 1965: 1963: 1962: 1951: 1948: 1947: 1945: 1944: 1939: 1934: 1929: 1924: 1919: 1918: 1917: 1912: 1907: 1902: 1897: 1892: 1887: 1882: 1867: 1866: 1861: 1851: 1850: 1845: 1840: 1835: 1830: 1825: 1819: 1817: 1813: 1812: 1810: 1809: 1804: 1798: 1796: 1792: 1791: 1789: 1788: 1787: 1786: 1781: 1771: 1766: 1761: 1760: 1759: 1749: 1744: 1743: 1742: 1737: 1726: 1724: 1723:Other pathways 1720: 1719: 1717: 1716: 1711: 1706: 1701: 1696: 1695: 1694: 1684: 1679: 1673: 1671: 1665: 1664: 1662: 1661: 1660: 1659: 1654: 1644: 1643: 1642: 1637: 1632: 1627: 1622: 1617: 1612: 1607: 1602: 1597: 1592: 1587: 1573: 1572: 1571: 1566: 1561: 1546: 1544: 1538: 1537: 1532: 1530: 1529: 1522: 1515: 1507: 1498: 1497: 1495: 1494: 1481: 1468: 1455: 1442: 1429: 1416: 1402: 1400: 1396: 1395: 1393: 1392: 1387: 1382: 1377: 1372: 1366: 1364: 1360: 1359: 1357: 1356: 1351: 1346: 1341: 1335: 1333: 1332:Classification 1329: 1328: 1326: 1325: 1320: 1315: 1310: 1304: 1302: 1298: 1297: 1295: 1294: 1289: 1284: 1279: 1274: 1269: 1264: 1259: 1253: 1251: 1247: 1246: 1241: 1239: 1238: 1231: 1224: 1216: 1207: 1206: 1204: 1203: 1202: 1201: 1196: 1186: 1181: 1172: 1158: 1153: 1148: 1147: 1146: 1141: 1131: 1126: 1121: 1115: 1113: 1109: 1108: 1106: 1105: 1100: 1094: 1092: 1086: 1085: 1083: 1082: 1077: 1072: 1067: 1061: 1059: 1052: 1051: 1049: 1048: 1043: 1042: 1041: 1036: 1026: 1021: 1016: 1010: 1008: 1002: 1001: 999: 998: 997: 996: 991: 981: 969: 968: 967: 966: 961: 956: 951: 946: 941: 936: 931: 926: 921: 916: 911: 906: 901: 896: 891: 881: 876: 871: 866: 861: 856: 847: 845: 839: 838: 836: 835: 834: 833: 828: 818: 813: 808: 802: 800: 794: 793: 778:Endopeptidases 776: 774: 773: 766: 759: 751: 729: 728: 677: 642:(5930): 1034. 622: 571: 550:(3): 836–844. 530: 481: 474: 453: 434:(6): 637–656. 409: 346: 345: 343: 340: 334:that combines 293:topoisomerases 281:bacteriophages 272: 269: 188:LexA repressor 182: 181: 178: 177: 172: 166: 165: 152: 146: 145: 135: 128: 127: 119: 118: 105: 99: 98: 93: 87: 86: 81: 74: 73: 68: 62: 61: 58: 54: 53: 49: 48: 45: 37: 36: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2035: 2024: 2021: 2019: 2016: 2014: 2011: 2009: 2006: 2004: 2001: 2000: 1998: 1988: 1983: 1978: 1974: 1961: 1953: 1952: 1949: 1943: 1940: 1938: 1935: 1933: 1930: 1928: 1925: 1923: 1920: 1916: 1913: 1911: 1908: 1906: 1903: 1901: 1898: 1896: 1893: 1891: 1888: 1886: 1883: 1881: 1878: 1877: 1876: 1872: 1871:FANC proteins 1869: 1868: 1865: 1862: 1860: 1856: 1853: 1852: 1849: 1846: 1844: 1841: 1839: 1836: 1834: 1831: 1829: 1826: 1824: 1821: 1820: 1818: 1814: 1808: 1805: 1803: 1800: 1799: 1797: 1793: 1785: 1782: 1780: 1777: 1776: 1775: 1772: 1770: 1767: 1765: 1762: 1758: 1755: 1754: 1753: 1750: 1748: 1745: 1741: 1738: 1736: 1733: 1732: 1731: 1728: 1727: 1725: 1721: 1715: 1712: 1710: 1707: 1705: 1702: 1700: 1697: 1693: 1692:RecQ helicase 1690: 1689: 1688: 1685: 1683: 1680: 1678: 1675: 1674: 1672: 1670: 1666: 1658: 1655: 1653: 1650: 1649: 1648: 1645: 1641: 1638: 1636: 1633: 1631: 1628: 1626: 1623: 1621: 1618: 1616: 1613: 1611: 1608: 1606: 1603: 1601: 1598: 1596: 1593: 1591: 1588: 1586: 1583: 1582: 1581: 1577: 1574: 1570: 1567: 1565: 1562: 1560: 1557: 1556: 1555: 1551: 1548: 1547: 1545: 1543: 1539: 1535: 1528: 1523: 1521: 1516: 1514: 1509: 1508: 1505: 1492: 1488: 1487: 1482: 1479: 1475: 1474: 1469: 1466: 1462: 1461: 1456: 1453: 1449: 1448: 1443: 1440: 1436: 1435: 1430: 1427: 1423: 1422: 1417: 1414: 1410: 1409: 1404: 1403: 1401: 1397: 1391: 1388: 1386: 1383: 1381: 1378: 1376: 1373: 1371: 1368: 1367: 1365: 1361: 1355: 1352: 1350: 1349:Enzyme family 1347: 1345: 1342: 1340: 1337: 1336: 1334: 1330: 1324: 1321: 1319: 1316: 1314: 1313:Cooperativity 1311: 1309: 1306: 1305: 1303: 1299: 1293: 1290: 1288: 1285: 1283: 1280: 1278: 1275: 1273: 1272:Oxyanion hole 1270: 1268: 1265: 1263: 1260: 1258: 1255: 1254: 1252: 1248: 1244: 1237: 1232: 1230: 1225: 1223: 1218: 1217: 1214: 1200: 1197: 1195: 1192: 1191: 1190: 1187: 1185: 1184:Streptokinase 1182: 1180: 1176: 1173: 1170: 1166: 1162: 1159: 1157: 1154: 1152: 1149: 1145: 1142: 1140: 1137: 1136: 1135: 1132: 1130: 1127: 1125: 1122: 1120: 1117: 1116: 1114: 1110: 1104: 1101: 1099: 1096: 1095: 1093: 1091: 1087: 1081: 1078: 1076: 1073: 1071: 1068: 1066: 1063: 1062: 1060: 1058: 1057:immune system 1053: 1047: 1046:C3-convertase 1044: 1040: 1037: 1035: 1032: 1031: 1030: 1027: 1025: 1022: 1020: 1017: 1015: 1012: 1011: 1009: 1007: 1003: 995: 992: 990: 987: 986: 985: 982: 980: 977: 975: 971: 970: 965: 962: 960: 957: 955: 952: 950: 947: 945: 942: 940: 937: 935: 932: 930: 927: 925: 922: 920: 917: 915: 912: 910: 907: 905: 902: 900: 897: 895: 892: 890: 887: 886: 885: 882: 880: 877: 875: 872: 870: 867: 865: 862: 860: 857: 855: 852: 849: 848: 846: 844: 840: 832: 829: 827: 824: 823: 822: 819: 817: 814: 812: 809: 807: 804: 803: 801: 799: 795: 790: 787: 783: 779: 772: 767: 765: 760: 758: 753: 752: 749: 744: 740: 736: 724: 720: 715: 710: 705: 700: 696: 692: 688: 681: 678: 673: 669: 665: 661: 657: 653: 649: 645: 641: 637: 633: 626: 623: 618: 614: 610: 606: 602: 598: 594: 590: 586: 582: 575: 572: 567: 563: 558: 553: 549: 545: 541: 534: 531: 526: 522: 517: 512: 508: 504: 500: 496: 492: 485: 482: 477: 475:9781555819750 471: 467: 460: 458: 454: 449: 445: 441: 437: 433: 429: 425: 418: 416: 414: 410: 405: 401: 397: 393: 388: 383: 379: 375: 371: 367: 363: 356: 354: 352: 348: 341: 339: 337: 333: 328: 326: 323: 319: 315: 310: 306: 302: 298: 294: 290: 289:ciprofloxacin 286: 282: 278: 270: 268: 266: 262: 258: 254: 250: 246: 241: 239: 235: 231: 227: 223: 222:cell division 219: 216: 212: 208: 204: 201: 197: 193: 189: 176: 173: 171: 167: 164: 160: 156: 153: 151: 147: 143: 139: 136: 133: 129: 124: 120: 117: 113: 109: 106: 104: 100: 97: 94: 92: 88: 85: 82: 79: 75: 72: 69: 67: 63: 60:LexA_DNA_bind 59: 55: 50: 43: 38: 33: 30: 19: 1874: 1855:DNA helicase 1838:8-Oxoguanine 1807:SOS response 1687:RecF pathway 1640:Excinuclease 1486:Translocases 1483: 1470: 1457: 1444: 1431: 1421:Transferases 1418: 1405: 1262:Binding site 974:fibrinolysis 972: 850: 816:Chymotrypsin 694: 691:PLOS Biology 690: 680: 639: 635: 625: 584: 580: 574: 547: 543: 533: 498: 494: 484: 465: 431: 427: 372:(1): 82–93. 369: 365: 329: 274: 255:DNA binding 249:dimerization 242: 225: 207:SOS response 191: 187: 185: 29: 1257:Active site 879:Factor XIIa 859:Factor VIIa 843:Coagulation 697:(6): e176. 277:antibiotics 52:Identifiers 2023:DNA repair 1997:Categories 1795:Regulation 1774:Photolyase 1534:DNA repair 1460:Isomerases 1434:Hydrolases 1301:Regulation 1161:Subtilisin 1103:Batroxobin 884:Kallikrein 874:Factor XIa 864:Factor IXa 831:Pancreatic 826:Neutrophil 342:References 336:quinolones 325:integrases 297:DNA gyrase 261:N-terminus 215:DNA repair 138:structures 2018:EC 3.4.21 1615:XPG/ERCC5 1600:XPD/ERCC2 1339:EC number 1189:Cathepsin 1175:Sedolisin 1151:Prostasin 869:Factor Xa 743:IPR006199 309:resistant 203:3.4.21.88 196:repressor 96:IPR006199 1960:Category 1610:XPF/DDB1 1605:XPE/DDB1 1363:Kinetics 1287:Cofactor 1250:Activity 1090:Venombin 1075:Tryptase 1070:Granzyme 1024:Factor I 1019:Factor D 1014:Factor B 854:Thrombin 851:factors: 821:Elastase 739:InterPro 723:15869329 672:42334786 664:19460999 609:14688795 566:15819636 448:17883408 404:29537019 396:18726173 387:11131485 322:integron 295:such as 285:UV light 226:de facto 155:RCSB PDB 91:InterPro 1987:Biology 1802:SOS box 1554:AP site 1473:Ligases 1243:Enzymes 1129:Pronase 1119:Acrosin 1065:Chymase 979:Plasmin 811:Trypsin 714:1088971 644:Bibcode 636:Science 617:4300746 589:Bibcode 525:8076591 265:SOS box 218:enzymes 71:PF01726 1973:Portal 1927:FANCD2 1922:FANCD1 1682:RecBCD 1635:RAD23B 1630:RAD23A 1447:Lyases 1156:Reelin 1098:Ancrod 1055:Other 789:3.4.21 721:  711:  670:  662:  615:  607:  581:Nature 564:  523:  516:395313 513:  472:  446:  402:  394:  384:  283:, and 247:and a 170:PDBsum 144:  134:  116:SUPFAM 84:CL0123 57:Symbol 1942:FANCN 1937:FANCJ 1932:FANCI 1915:FANCM 1910:FANCL 1905:FANCG 1900:FANCF 1895:FANCE 1890:FANCC 1885:FANCB 1880:FANCA 1740:ERCC8 1735:ERCC6 1699:RAD51 1620:ERCC1 1399:Types 1165:Furin 1112:Other 1039:MASP2 1034:MASP1 964:KLK15 959:KLK14 954:KLK13 949:KLK12 944:KLK11 939:KLK10 668:S2CID 613:S2CID 400:S2CID 257:motif 232:with 112:SCOPe 103:SCOP2 1828:PcrA 1784:CRY2 1779:CRY1 1714:LexA 1709:Slx4 1704:Sgs1 1677:RecA 1657:MSH2 1652:MLH1 1580:ERCC 1491:list 1484:EC7 1478:list 1471:EC6 1465:list 1458:EC5 1452:list 1445:EC4 1439:list 1432:EC3 1426:list 1419:EC2 1413:list 1406:EC1 1179:TPP1 1029:MASP 934:KLK9 929:KLK8 924:KLK7 919:KLK6 914:KLK5 909:KLK4 904:KLK3 899:KLK2 894:KLK1 737:and 735:Pfam 719:PMID 660:PMID 605:PMID 562:PMID 521:PMID 470:ISBN 444:PMID 392:PMID 316:and 303:for 234:RecA 220:and 192:LexA 186:The 163:PDBj 159:PDBe 142:ECOD 132:Pfam 108:1leb 80:clan 78:Pfam 66:Pfam 18:LexA 1864:WRN 1859:BLM 1823:Ogt 1625:RPA 1595:XPC 1590:XPB 1585:XPA 1169:S1P 889:PSA 709:PMC 699:doi 652:doi 640:324 597:doi 585:427 552:doi 511:PMC 503:doi 436:doi 382:PMC 374:doi 299:or 190:or 150:PDB 1999:: 1873:: 1857:: 1757:Ku 786:EC 780:: 741:: 717:. 707:. 693:. 689:. 666:. 658:. 650:. 638:. 634:. 611:. 603:. 595:. 583:. 560:. 548:56 546:. 542:. 519:. 509:. 499:13 497:. 493:. 456:^ 442:. 432:31 430:. 426:. 412:^ 398:. 390:. 380:. 370:66 368:. 364:. 350:^ 279:, 240:. 228:a 213:, 200:EC 161:; 157:; 140:/ 114:/ 110:/ 1975:: 1578:/ 1552:/ 1526:e 1519:t 1512:v 1493:) 1489:( 1480:) 1476:( 1467:) 1463:( 1454:) 1450:( 1441:) 1437:( 1428:) 1424:( 1415:) 1411:( 1235:e 1228:t 1221:v 1199:G 1194:A 1177:/ 1171:4 1167:/ 1163:/ 1144:2 1139:1 976:: 791:) 784:( 770:e 763:t 756:v 725:. 701:: 695:3 674:. 654:: 646:: 619:. 599:: 591:: 568:. 554:: 527:. 505:: 478:. 450:. 438:: 406:. 376:: 198:( 20:)

Index

LexA

Pfam
PF01726
Pfam
CL0123
InterPro
IPR006199
SCOP2
1leb
SCOPe
SUPFAM
Pfam
structures
ECOD
PDB
RCSB PDB
PDBe
PDBj
PDBsum
structure summary
repressor
EC
3.4.21.88
SOS response
DNA polymerases
DNA repair
enzymes
cell division
two-component regulatory system

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