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{{enzyme
| Name = 4-carboxymethyl-4-methylbutenolide mutase
| EC_number = 5.4.99.14
| CAS_number =
| IUBMB_EC_number = 5/4/99/14
| GO_code = 0047469
| image =
| width =
| caption =
}}
In [[enzymology]], a '''4-carboxymethyl-4-methylbutenolide mutase''' ({{EC number|5.4.99.14}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]

:4-carboxymethyl-4-methylbut-2-en-1,4-olide <math>\rightleftharpoons</math> 4-carboxymethyl-3-methylbut-2-en-1,4-olide

Hence, this enzyme has one [[substrate (biochemistry)|substrate]], [[4-carboxymethyl-4-methylbut-2-en-1,4-olide]], and one [[product (chemistry)|product]], [[4-carboxymethyl-3-methylbut-2-en-1,4-olide]].

This enzyme belongs to the family of [[isomerase]]s, specifically those intramolecular transferases transferring other groups. The systematic name of this enzyme class is '''4-carboxymethyl-4-methylbut-2-en-1,4-olide methylmutase'''. Other names in common use include '''4-methyl-2-enelactone isomerase''', '''4-methylmuconolactone methylisomerase''', and '''4-methyl-3-enelactone methyl isomerase'''.

==References==
{{reflist|1}}
* {{cite journal | author = Bruce NC and Cain RB | date = 1988 | title = beta-Methylmuconolactone, a key intermediate in the dissimilation of methylaromatic compounds by a modified 3-oxoadipate pathway evolved in nocardioform actinomycetes | journal = FEMS Microbiol. Lett. | volume = 50 | pages = 233–239 }}

{{isomerase-stub}}

[[Category:EC 5.4.99]]
[[Category:Enzymes of unknown structure]]

16-hydroxysteroid epimerase - Revision history

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