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{{Infobox enzyme
| Name = Gamma-L-glutamyl-butirosin B gamma-glutamyl cyclotransferase
| EC_number = 4.3.2.6
| CAS_number = 
| IUBMB_EC_number = 4/3/2/6
| GO_code = 
| image = 
| width = 
| caption =
}}
'''Gamma-L-glutamyl-butirosin B gamma-glutamyl cyclotransferase''' ({{EC number|4.3.2.6}}, ''btrG (gene)'') is an [[enzyme]] with system name ''gamma-L-glutamyl-butirosin B gamma-glutamyl cyclotransferase (5-oxoproline producing)''.<ref>{{cite journal | title = Biosynthesis of butirosin: transfer and deprotection of the unique amino acid side chain |author = Llewellyn, N.M., Li, Y. and Spencer, J.B. |journal = Chem. Biol. |year = 2007 |volume = 14 |pages = 379–386 |pmid = 17462573}}</ref> This enzyme [[catalysis|catalyses]] the following [[chemical reaction]]

: gamma-L-glutamyl-butirosin B <math>\rightleftharpoons</math> butirosin B + 5-[[oxoproline]]

The enzyme catalyses the last step in the biosynthesis of the [[aminoglycoside]] [[antibiotic]] butirosin B. 

== References ==
{{reflist}}

== External links ==
* {{MeshName|Gamma-L-glutamyl-butirosin+B+gamma-glutamyl+cyclotransferase}}

[[Category:EC 4.3.2]]