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{{enzyme
| Name = protoaphin-aglucone dehydratase (cyclizing)
| EC_number = 4.2.1.73
| CAS_number = 64177-87-3
| IUBMB_EC_number = 4/2/1/73
| GO_code = 0047452
| image = 
| width = 
| caption = 
}}
In [[enzymology]], a '''protoaphin-aglucone dehydratase (cyclizing)''' ({{EC number|4.2.1.73}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]

:protoaphin aglucone <math>\rightleftharpoons</math> xanthoaphin + H<sub>2</sub>O

Hence, this enzyme has one [[substrate (biochemistry)|substrate]], [[protoaphin aglucone]], and two [[product (chemistry)|products]], [[xanthoaphin]] and [[water|H<sub>2</sub>O]].

This enzyme belongs to the family of [[lyase]]s, specifically the hydro-lyases, which cleave carbon-oxygen bonds.  The systematic name of this enzyme class is '''protoaphin-aglucone hydro-lyase (cyclizing; xanthoaphin-forming)'''. Other names in common use include '''protoaphin dehydratase''', '''protoaphin dehydratase (cyclizing)''', and '''protoaphin-aglucone hydro-lyase (cyclizing)'''.  

==References==
{{reflist|1}}
* {{cite journal | author = Cameron DW, Sawyer WH and Trikojus VM | date = 1977 | title = Colouring matters of the Aphidoidea. XLII. Purification and properties of the cyclising enzyme [Protoaphin dehydratase (cyclising)] concerned with pigment transformation in the wooly aphid Eriosoma lanigerum Hausmann (Hemiptera: Insecta) | journal = Aust. J. Biol. Sci.  | volume = 30 | pages = 173&ndash;181 }}

{{4.2-enzyme-stub}}

[[Category:EC 4.2.1]]
[[Category:Enzymes of unknown structure]]