Everything about Artificial Enzyme totally explained
An
artificial enzyme is a synthetic, organic molecule prepared to recreate the active site of an enzyme.
Enzyme catalysis of chemical reactions occur with high selectivity and rate in a small part of the enzyme macromolecule known as the
active site. There, the binding of a
substrate close to
functional groups in the enzyme causes
catalysis by so-called proximity effects. It is therefore possible to create similar catalysts from small molecule mimics of
enzyme active sites by combining, in a small molecule, the ability to bind substrate with catalytic functional groups. Since the artificial enzymes need to bind molecules, they're made based on a host-molecule such as a
cyclodextrin,
crown ethers or
calixarene etc.
A number of artificial enzymes have been reported catalysing various reactions with rate increases up to 10
3; this is nevertheless substantially lower than natural enzymes that typically causes rate increases above 10
6. One of the pioneers in artificial enzyme reasearch is chemist
Ronald Breslow.
New approaches based on
amino acids or
peptides as characteristic molecular moieties have led to a significant expansion of the field of artificial enzymes or enzyme mimics. For instance, recent results by the group of Rob Liskamp
(External Link
) have shown that scaffolded histidine residues can be used as mimics of certain
metalloproteins and -enzymes. Especially the structural mimicry of certain
copper proteins (for example
hemocyanin,
tyrosinase and
catechol oxidase), containing so-called type-3 copper binding sites, has been shown. This is a significant improvement since the use of scaffolded histidine residues is one step closer to the mimicry of enzymes by biological relevant species such as amino acids and peptides
(External Link
).
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