Reaction catalyzed by N-terminal methionine Nalpha-acetyltransferase NatB (2.3.1.254)

		+		an N-terminal L-methionyl-L-asparaginyl-[protein]	=		an N-terminal Nalpha-acetyl-L-methionyl-L-asparaginyl-[protein]	+		CoA
	acetyl-CoA	+		an N-terminal L-methionyl-L-asparaginyl-[protein]	=		an N-terminal Nalpha-acetyl-L-methionyl-L-asparaginyl-[protein]	+		CoA