Involved in the biosynthesis of terminal alkyne-containing amino acids such as L-propargylglycine (Pra) and L-beta-ethynylserine, that are produced as antibiotics by S.cattleya. Catalyzes an oxidative C-C bond cleavage in 4-chloro-L-lysine to form 4-chloro-allyl-L-glycine (also named L-2-amino-4-chloropent-4-enoate), with release of formaldehyde and ammonia. Is also able to react with L-lysine directly to produce allylglycine in vitro. 4-chloro-L-lysine + AH2 + O2 = A + formaldehyde + H2O + L-2-amino-4-chloropent-4-enoate + NH4(+) Binds 2 Fe(2+) ions per subunit. Amino-acid metabolism. Antibiotic biosynthesis. Cells lacking this gene no longer produce detectable amounts of L-propargylglycine and L-beta-ethynylserine, that are terminal alkyne-containing amino acids produced by wild-type S.cattleya.