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{{enzyme
| Name = FAD-AMP lyase (cyclizing)
| EC_number = 4.6.1.15
| CAS_number = 208349-48-8
| IUBMB_EC_number = 4/6/1/15
| GO_code = 
| image = 
| width = 
| caption = 
}}
In [[enzymology]], a '''FAD-AMP lyase (cyclizing)''' ({{EC number|4.6.1.15}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]

:FAD <math>\rightleftharpoons</math> AMP + riboflavin cyclic-4',5'-phosphate

Hence, this enzyme has one [[substrate (biochemistry)|substrate]], [[FAD]], and two [[product (chemistry)|products]], [[adenosine monophosphate|AMP]] and [[riboflavin cyclic-4',5'-phosphate]].

This enzyme belongs to the family of [[lyase]]s, specifically the class of phosphorus-oxygen lyases.  The systematic name of this enzyme class is '''FAD AMP-lyase (riboflavin-cyclic-4',5'-phosphate-forming)'''. Other names in common use include '''FMN cyclase''', and '''FAD AMP-lyase (cyclic-FMN-forming)'''.  

==References==
{{reflist|1}}
* {{cite journal | author = Cameselle JC | date =  1998 | title = Enzymic formation of riboflavin 4',5'-cyclic phosphate from FAD: evidence for a specific low-Km FMN cyclase in rat liver1 | journal = Biochem. J.  | volume = 330 | pages = 881&ndash;8  | pmid = 9480905 | last2 = Pinto | first2 = RM | last3 = Costas | first3 = MJ | last4 = Aavalos | first4 = M | last5 = Canales | first5 = J | last6 = Cabezas | first6 = A | last7 = Cameselle | first7 = JC | pmc = 1219220 | issue = Pt 2 }}
* {{cite journal | author = Cameselle JC | date = 2001 | title = Purification, characterization, and substrate and inhibitor structure-activity studies of rat liver FAD-AMP lyase (cyclizing): preference for FAD and specificity for splitting ribonucleoside diphosphate-X into ribonucleotide and a five-atom cyclic phosphodiester of X, either a monocyclic compound or a ''cis''-bicyclic phosphodiester-pyranose fusion | journal = Biochemistry.  | volume = 40 | pages = 13710&ndash;22  | pmid = 11695920 | doi = 10.1021/bi0157159 | last2 = Pinto | first2 = RM | last3 = Fraiz | first3 = F | last4 = Canales | first4 = J | last5 = González-Santiago | first5 = S | last6 = Cameselle | first6 = JC | issue = 45 }}

{{enzyme-stub}}
{{Phosphorus-oxygen lyases}}
[[Category:EC 4.6.1]]
[[Category:Enzymes of unknown structure]]