Editing Enzyme (section)

==== Induced fit model ====
In 1958, [[Daniel E. Koshland, Jr.|Daniel Koshland]] suggested a modification to the lock and key model: since enzymes are rather flexible structures, the active site is continuously reshaped by interactions with the substrate as the substrate interacts with the enzyme.<ref>{{cite journal | vauthors = Koshland DE | title = Application of a Theory of Enzyme Specificity to Protein Synthesis | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 44 | issue = 2 | pages = 98–104 | date = February 1958 | pmid = 16590179 | pmc = 335371 | doi = 10.1073/pnas.44.2.98 | doi-access = free | bibcode = 1958PNAS...44...98K }}</ref> As a result, the substrate does not simply bind to a rigid active site; the amino acid [[Side chain|side-chains]] that make up the active site are molded into the precise positions that enable the enzyme to perform its catalytic function. In some cases, such as [[glycosidases]], the substrate [[molecule]] also changes shape slightly as it enters the active site.<ref>{{cite journal | vauthors = Vasella A, Davies GJ, Böhm M | title = Glycosidase mechanisms | journal = Current Opinion in Chemical Biology | volume = 6 | issue = 5 | pages = 619–629 | date = October 2002 | pmid = 12413546 | doi = 10.1016/S1367-5931(02)00380-0 }}</ref> The active site continues to change until the substrate is completely bound, at which point the final shape and charge distribution is determined.<ref>{{cite book | vauthors = Boyer R | title = Concepts in Biochemistry | edition = 2nd | publisher = John Wiley & Sons, Inc. | location = New York, Chichester, Weinheim, Brisbane, Singapore, Toronto. | isbn = 0-470-00379-0 | pages=137–8 | chapter = Chapter 6: Enzymes I, Reactions, Kinetics, and Inhibition | year = 2002 | oclc = 51720783 }}</ref>
Induced fit may enhance the fidelity of molecular recognition in the presence of competition and noise via the [[conformational proofreading]] mechanism.<ref>{{cite journal | vauthors = Savir Y, Tlusty T | title = Conformational proofreading: the impact of conformational changes on the specificity of molecular recognition | journal = PLOS ONE | volume = 2 | issue = 5 | pages = e468 | date = May 2007 | pmid = 17520027 | pmc = 1868595 | doi = 10.1371/journal.pone.0000468 | veditors = Scalas E | doi-access = free | bibcode = 2007PLoSO...2..468S }}</ref>