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

	[T26 protein]-L-glutamine	+			=		[T26 protein]-N5-pentyl-L-glutamine	+
	[T26 protein]-L-glutamine	+		5-(biotinamido)-pentylamine	=		[T26 protein]-N5-pentyl-L-glutamine	+		biotin