Le glucose-6-phosphatase, sous-unité catalytique (glucose-6-phosphatase alpha) est une enzyme qui, chez l'être humain, est codée par le gèneG6PC,.
La glucose-6-phosphatase est une protéine membranaire intégrale du réticulum endoplasmique qui catalyse l'hydrolyse du D-glucose-6-phosphate en D-glucose et en orthophosphate. C'est une enzyme clé de l'homéostasie du glucose, qui intervient dans la néoglucogenèse et la glycogénolyse. Des anomalies de cette enzyme sont à l'origine de la glycogénose type 1 (maladie de von Gierke).
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