Tk:E. coli cut sites

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  • CTAG sequences in the E. coli genome are rare.
  • SpeI cut sites in the E.coli genome: 74
  • XbaI cut sites in the E. coli genome: 40


  • PstI cut sites in a 300Kbp region of the E. coli genome: 79
  • Average length of PstI fragment: 300K/79 = 3800
  • We would expect the average length of a double cut XbaI / PstI fragment to be about 1900 bp, and there to be about 40 different ones.
  • Likely there are a few with order of 100 bp length


  • EcoRI cut sites in a 300Kbp region of the E. coli genome: 42, but 18 are methylation inhibited. 24 are left actually cut.
  • Average length of EcoRI fragment: 300K/24 = 12500
  • We would expect the average length of the double cut EcoRI / SpeI to be about 6250 bp, and there to be about 79 of them.
  • Likely there are a few with order of 80 bp length


  • 1-300KB
  • 11828 SpeI ACTAGT
  • 25681 XbaI TCTAGA
  • 84649 SpeI ACTAGT
  • 131428 XbaI TCTAGA
  • 237191 XbaI TCTAGA
  • 270729 XbaI TCTAGA
  • 310919 SpeI ACTAGT
  • 380545 SpeI ACTAGT
  • 380557 SpeI ACTAGT
  • 405554 SpeI ACTAGT
  • 445916 SpeI ACTAGT
  • 570189 SpeI ACTAGT
  • 594695 XbaI TCTAGA
  • 849339 XbaI TCTAGA
  • 889063 SpeI ACTAGT
  • 889173 SpeI ACTAGT
  • 921898 XbaI TCTAGA
  • 968572 SpeI ACTAGT
  • 1098843 SpeI ACTAGT
  • 1184031 XbaI TCTAGA
  • 1195749 SpeI ACTAGT
  • 1196554 XbaI TCTAGA
  • 1196673 XbaI TCTAGA
  • 1198740 XbaI TCTAGA
  • 1214824 SpeI ACTAGT
  • 1219071 SpeI ACTAGT
  • 1321138 SpeI ACTAGT
  • 1321146 SpeI ACTAGT
  • 1343440 # SpeI ACTAGT
  • 1467188 SpeI ACTAGT
  • 1467200 SpeI ACTAGT
  • 1468285 XbaI TCTAGA
  • 1494788 XbaI TCTAGA
  • 1522924 SpeI ACTAGT
  • 1566793 SpeI ACTAGT
  • 1686509 SpeI ACTAGT
  • 1695103 SpeI ACTAGT
  • 1710491 SpeI ACTAGT
  • 1743206 XbaI TCTAGA
  • 1745491 SpeI ACTAGT
  • 1755429 XbaI TCTAGA
  • 1786307 SpeI ACTAGT
  • 1970292 XbaI TCTAGA
  • 2001080 SpeI ACTAGT
  • 2009992 XbaI TCTAGA
  • 2068219 SpeI ACTAGT
  • 2068231 SpeI ACTAGT
  • 2088067 SpeI ACTAGT
  • 2096253 SpeI ACTAGT