The Evolving Knowledge of Nutrition - Adequate Food for All - page 25

tAble 2.2
glucosidases Active in food carbohydrate digestion in human small Intestine

name Abbreviation chromosome subunits functions divergence ec

Lactase LCT 2q21 Yes Digests lactose Archaea ~ 3.5 bya 3.2.1.108

3.2.1.23

-phlorazin hydrolase LCT 2q21 Yes Digests glycosides Archaea ~ 3.5 bya 3.2.1.62

Amylase, pancreatic AMY2A 1p21 Yes; Ca, Cl Solubilizes 1,4 starch Archaea ~ 3.5 bya 3.2.1.1

Amylase, salivary AMY1A-1C 1p21 Yes; Ca, Cl Solubilizes 1,4 starch Archaea ~ 3.5 bya 3.2.1.1

Maltase MGAM 7q34 Yes; isoforms Degrades 1,4 oligomers Archaea ~ 3.5 bya 3.2.1.20

-glucoamylase MGAM 7q34 Yes; isoforms Degrades 1,4 polymers Archaea ~ 3.5 bya 3.2.1.3

Sucrase SI 3q25 Yes; isoforms Degrades 1,4 oligomers Archaea ~ 3.5 bya 3.2.1.48

3.2.1.20

-isomaltase SI 3q25 Yes; isoforms Degrades 1,4, 1,6 oligomers Archaea ~ 3.5 bya 3.2.1.10

3.2.1.33
3.2.1.20

bya, billion years ago.