Recombination of "Sticky Ends"

    DNA molecules from two different sources (blue and red) are cut with the same restriction endonuclease enzyme, in this case EcoRI. This leaves fragments with identical overhanging ~~TTAA-5' "sticky ends". Because the EcoRI site is a palindrome, tails from the blue and red DNAs are complementary and can come together in new combinations ("recombination"). Gaps in the sticky ends are sealed with the enzyme DNA ligase.

Text material © 2012 by Steven M. Carr