Catalyzes a reversible transamination reaction between pyridoxamine and pyruvate to form pyridoxal and L-alanine. pyridoxamine + pyruvate = L-alanine + pyridoxal kcat is 28 sec(-1) for pyridoxamine. kcat is 41 sec(-1) for pyridoxal. kcat is 29 sec(-1) for pyruvate. kcat is 24 sec(-1) for 2-oxobutyrate. kcat is 41 sec(-1) for L-alanine. kcat is 9 sec(-1) for (S)-2-aminobutyrate. Optimum pH is 9.5. Homotetramer. Belongs to the class-V pyridoxal-phosphate-dependent aminotransferase family.