Involved in degradation of fumonisin B1. Catalyzes the deamination of aminopentol (HFB1) to 2-keto-HFB1. Pyruvate is the preferred cosubstrate, but it can also use several other alpha-keto acids as amino group acceptors. (2S,3S,5R,10R,12S,14S,15R,16R)-2-amino-12,16-dimethylicosane-3,5,10,14,15-pentol + pyruvate = (3S,5R,10R,12S,14S,15R,16R)-3,5,10,14,15-pentahydroxy-12,16-dimethylicosan-2-one + L-alanine kcat is 104 min(-1). Optimum pH is 8.5. Optimum temperature is 35 degrees Celsius. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family.