Molecular Life Sciences

Living Edition
| Editors: Robert D. Wells, Judith S. Bond, Judith Klinman, Bettie Sue Siler Masters, Ellis Bell

Some Key Enzymes Used in Cloning

Living reference work entry


A large number of different enzymes are used in DNA cloning procedures. DNA ligase is used to join two DNA molecules covalently, the key step in constructing a recombinant plasmid from a cloning vector and a DNA insert. The ends of DNA molecules can be modified to allow or prevent ligation by using the enzymes polynucleotide kinase or alkaline phosphatase. Enzymes that catalyze DNA synthesis, including DNA polymerases, reverse transcriptase, and terminal deoxynucleotidyl transferase, find application in many ways in cloning procedures, including to modify DNA ends to control ligation, in the polymerase chain reaction, in DNA sequencing, to produce DNA copies of RNA molecules, and other applications. A variety of nucleases are available that can be used to remove unwanted DNA, to modify DNA ends, and to delete larger portions of a DNA molecule.


The isolation, modification, and joining of specific DNA fragments to produce recombinant products are essential steps in...


Terminal Deoxynucleotidyl Transferase Phosphoryl Group Exonuclease Activity Phosphodiester Bond Klenow Fragment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Chemistry and BiochemistryUniversity of MarylandCollege ParkUSA