Dextrans are (A)____ of (B)_____ produced extracellularly by bacteria and yeast. The enzyme used to produce dextrans is (C)_____, and the substrate is (D)______. A side product of dextran production is (E)____, which is formed into (F)______ and stored intracellulary as reserve nutrients.
(C) Dextran synthase/glucosyl transferase/fructosyl transferase
- (A) polysaccharides
- (B) Glucose
- (C) glucosyl transferase (dexran sucrase)
- (D) Sucrose
- (E) Fructose
- (F) Levans (fructans)
Dextrans are polysaccharides of glucose produced extracellularly by bacteria and yeast using the enzyme glucosyl transferase
(dextran sucrase) with the substrate being sucrose (table sugar).
A few bacteria like Strep mutans produce dextran from sucrose, a sticky polymer of glucose molecules produced outside the cell wall by glucosyl transferase and forms a glucocalyx
essential for cariogenicity.
(levans) also promote adhesion to surfaces of teeth and dental plaque and they're reserve nutrients for bacteria.