Reaction catalyzed by protein-glutamine gamma-glutamyltransferase (2.3.2.13)

	[amyloid-beta]-L-glutamine	+			=		[amyloid-beta]-N5-alkyl-L-glutamine	+		NH3
	[amyloid-beta]-L-glutamine	+		alkylamine	=		[amyloid-beta]-N5-alkyl-L-glutamine	+		NH3