Journal
MOLECULAR NUTRITION & FOOD RESEARCH
Volume 58, Issue 5, Pages 1111-1121Publisher
WILEY
DOI: 10.1002/mnfr.201300599
Keywords
ctMGAM; Glucogenesis; Glycemic spike; Mucosal -glucosidases; Starch digestion
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Funding
- USDA AFRI competitive grant program [08-555-03-18793]
- Canadian Institutes for Health Research [CIHR MOP111237]
- Heart and Stoke Foundation of Ontario [NA-6305]
- CIHR-Canadian Digestive Health Foundation studentship
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ScopeThe four mucosal -glucosidases, which differ in their digestive roles, generate glucose from glycemic carbohydrates and accordingly can be viewed as a control point for rate of glucose delivery to the body. In this study, individual recombinant enzymes were used to understand how -glucan oligomers are digested by each enzyme, and how intermediate -amylolyzed starches are hydrolyzed, to elucidate a strategy for moderating the glycemic spike of rapidly digestible starchy foods. Methods and resultsThe C-terminal maltase-glucoamylase (ctMGAM, commonly termed glucoamylase) was able to rapidly hydrolyze longer maltooligosaccharides, such as maltotetraose and maltopentaose, to glucose. Moreover, it was found to convert larger size maltodextrins, as would be produced early in -amylase digestion of starch, efficiently to glucose. It is postulated that ctMGAM has the additional capacity to hydrolyze large -amylase products that are produced immediately on starch digestion in the duodenum and contribute to the rapid generation of glucose from starch-based meals. ConclusionThe findings suggest that partial inhibition of ctMGAM, such as by natural inhibitors found in foods, might be used to moderate the early stage of high glycemic response, as well as to extend digestion distally; thereby having relevance in regulating glucose delivery to the body.
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