Involved in phosphonate degradation. (2-aminoethyl)phosphonate + pyruvate = L-alanine + phosphonoacetaldehyde 1 pyridoxal phosphate per subunit. Inhibited by phosphonic acids and very slightly inhibited by aminophosphonic acids. Optimum pH is 8.5-9. Optimum temperature is 50 degrees Celsius. Activity increases from 30 to 50 degrees Celsius, the enzyme is inactive at 70 degrees Celsius. Homotetramer; however this is for an enzyme with a molecular weight of 16500, which is in disagreement with the weight of this protein. By 2-aminoethylphosphonic acid. Belongs to the class-V pyridoxal-phosphate-dependent aminotransferase family. PhnW subfamily.