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In
enzymology Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. A ...
, a cholestenol Δ-isomerase () is an
enzyme Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. A ...
that catalyzes the
chemical reaction A chemical reaction is a process that leads to the IUPAC nomenclature for organic transformations, chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the pos ...
:5alpha-cholest-7-en-3beta-ol \rightleftharpoons 5alpha-cholest-8-en-3beta-ol Hence, this enzyme has one substrate, 5alpha-cholest-7-en-3beta-ol, and one
product Product may refer to: Business * Product (business), an item that serves as a solution to a specific consumer problem. * Product (project management), a deliverable or set of deliverables that contribute to a business solution Mathematics * Produ ...
, 5alpha-cholest-8-en-3beta-ol. This enzyme belongs to the family of
isomerase Isomerases are a general class of enzymes that convert a molecule from one isomer to another. Isomerases facilitate intramolecular rearrangements in which bonds are broken and formed. The general form of such a reaction is as follows: A–B ↠...
s, specifically those intramolecular oxidoreductases transposing C=C bonds. The
systematic name A systematic name is a name given in a systematic way to one unique group, organism, object or chemical substance, out of a specific population or collection. Systematic names are usually part of a nomenclature. A semisystematic name or semitrivial ...
of this enzyme class is Delta7-cholestenol Delta7-Delta8-isomerase. This enzyme participates in
biosynthesis of steroids A steroid is a biologically active organic compound with four rings arranged in a specific molecular configuration. Steroids have two principal biological functions: as important components of cell membranes that alter membrane fluidity; and a ...
.


See also

* Emopamil binding protein


References

* EC 5.3.3 Enzymes of unknown structure {{isomerase-stub