A flavoprotein (FMN). The reaction takes place in the direction of L-glutamate production. The protein is composed of two domains, one hydrolysing L-glutamine to NH3 and L-glutamate (cf. EC 126.96.36.199, glutaminase), the other combining the produced NH3 with 2-oxoglutarate to produce a second molecule of L-glutamate (cf. EC 188.8.131.52, glutamate dehydrogenase).