Galaktozid 3(4)-L-fukoziltransferaza je enzim koji je kod ljudi kodiran FUT3 genom.[1][2][3]
Levisov sistem histo-krvnih grupa obuhvata skup fukozilovanih glikosfingolipida koji se sintetišu u egzokrinim epitelnim ćelijama i cirkulišu u telesnim tečnostima. Glikosfingolipidi funkcionišu u embriogenezi, diferencijaciji tkiva, metastazama tumora, zapaljenju i bakterijskoj adheziji. Oni se sekundarno apsorbuju u crvena krvna zrnca što dovodi do njihovog Luisovog fenotipa. Ovaj gen je član porodice fukoziltransferaza, koja katalizuje dodavanje fukoze na prekurzor polisaharida u poslednjem koraku biosinteze Luisovog antigena. On kodira enzim sa aktivnostima alfa(1,3)-fukoziltransferaze i alfa(1,4)-fukoziltransferaze. Mutacije u ovom genu su odgovorne za većinu Levis antigen-negativnih fenotipova. Za ovaj gen je pronađeno više alternativnih splajsnih varijanti, koje kodiraju isti protein.[3]
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