alternansucrase

== English == === Etymology === From alternan +‎ sucrase. === Noun === alternansucrase (countable and uncountable, plural alternansucrases) (biochemistry) A glycosyltransferase enzyme that catalyzes a chemical reaction that transfers an alpha-D-glucosyl residue from sucrose alternately to the 6- and 3-positions of the non-reducing terminal residue of an alpha-D-glucan, thereby creating a glucan with alternating alpha-1,6- and alpha-1,3-bonds.