sentences:  More recent enzymatic evidence has indicated the presence of 17-oxosparteine synthase (OS), a transaminase enzyme.The deaminated cadaverine is not released from the enzyme, thus is can be assumed that the enzyme catalyzes the formation of the quinolizidine skeleton in a channeled fashion .7-oxosparteine requires four units of pyruvate as the NH2 acceptors and produces four molecules of alanine.