Aminotransferase that can use beta-amino acids, aliphatic amines, or aromatic amines as amino donors, and pyruvate as amino acceptor. Shows high activity for short-chain beta-amino acids, with the highest activity for 3-aminobutanoate and beta-alanine in vitro. Displays higher activity toward aromatic amines than aliphatic amines (PubMed:18239415). May be involved in beta-alanine biosynthesis and/or degradation (Probable). 3-oxopropanoate + L-alanine = beta-alanine + pyruvate 3-aminobutanoate + pyruvate = acetoacetate + L-alanine benzylamine + pyruvate = benzaldehyde + L-alanine (S)-1-phenylethylamine + pyruvate = acetophenone + L-alanine 2-phenylethylamine + pyruvate = 2-phenylacetaldehyde + L-alanine 1-phenylpropylamine + pyruvate = 1-phenylpropan-1-one + L-alanine 3-phenylpropylamine + pyruvate = 3-phenylpropanal + L-alanine Optimum pH is 8.5. Optimum temperature is 50 degrees Celsius. Homotetramer. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family.