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How
Recognize specific DNA base sequence -> cut DNA at recognition sequence in consisten way (restriction sites)
Discovery
in bacteria, which used them to destroy foreign DNA
Cut DNA pieces are called
restriction fragments
How many?
More than 4000
Staggered cuts create
sticky ends
Straight cuts create
blunt ends
Benefits of sticky ends
Can bond with complementary sticky ends on other DNA cut with same enzyme
How can pieces be joined?
DNA ligase-> recombinant DNA
Advantages using restriction enzymes
-made it possible to work with small and defined pieces of DNA
-study small, specific pieces of chromosomes
-recombinant DNA
-clone segments of DNA into plasmids and viruses
-manipulate specific pieces of DNA