FAD-dependent monooxygenase; part of the gene cluster that mediates the biosynthesis of the antitumor fumiquinazolines that confer a dual-usage capability to defend against phagocytes in the environment and animal hosts (PubMed:20225828, PubMed:20804163, PubMed:21899262, PubMed:24612080, PubMed:33705521). The simplest member is fumiquinazoline F (FQF) with a 6-6-6 tricyclic core derived from anthranilic acid (Ant), tryptophan (Trp), and alanine (Ala) (PubMed:20225828). The trimodular NRPS fmqA is responsible for FQF formation (PubMed:20225828). Modules 1, 2 and 3 of fmqA are predicted to activate and load Ant, Trp and Ala, respectively, providing for the assembly of an Ant-Trp-Ala-S-enzyme intermediate that would undergo double cyclization for chain release and generation of the tricyclic 6-6-6 product fumiquinazoline F (PubMed:20225828). The presence of an E domain predicted for module 2 of fmqA is consistent with epimerization of L-Trp to D-Trp during assembly to generate the R-stereocenter at C14 of FQF (PubMed:20225828). The FAD-dependent monooxygenase fmqB and the monomodular NRPS fmqC then maturate FQF to FQA (PubMed:20804163). FmqB oxidizes the 2',3'-double bond of the indole side chain of FQF, and fmqC activates L-Ala as the adenylate, installs it as the pantetheinyl thioester on its carrier protein domain, and acylates the oxidized indole for subsequent intramolecular cyclization to create the 6-5-5-imidazolindolone of FQA (PubMed:20804163). The FAD-linked oxidoreductase fmqD introduces a third layer of scaffold complexity by converting FQA to the spirohemiaminal FQC, presumably by catalyzing the formation of a transient imine within the pyrazinone ring (PubMed:21899262). FQC subsequently converts nonenzymatically to the known cyclic aminal FQD (PubMed:21899262). Alkaloid biosynthesis. Expression is positively regulated by brlA, a conidiation-specific transcription factor involved in the early stage of asexual development and necessary for conidiophore formation (PubMed:24612080). Expression is also induced by the cell wall integrity (CWI) signaling pathway that includes the mitogen-activated protein kinase mpkA and the transcription factor rlmA (PubMed:33705521). Expression is negatively regulated by the transcription factor sebA (PubMed:33705521). Abolishes the production of fumiquinazoline A and C and shows a 19-fold accumulation in fumiquinazoline F production (PubMed:24612080). Belongs to the paxM FAD-dependent monooxygenase family.