Inhibition by selected food components of human and porcine intestinal pteroylpolyglutamate hydrolase activity.
Am J Clin Nutr
; 51(1): 87-94, 1990 Jan.
Article
em En
| MEDLINE
| ID: mdl-2296933
ABSTRACT
Studies were conducted to determine the in vitro effect of selected food components on activity of the brush border membrane pteroylpolyglutamate hydrolase (folate conjugase) of porcine and human intestine. Foods differed widely in their effects although the pattern of the effects on both porcine and human enzymes was similar. Extracts of legumes, tomatoes, and orange juice consistently inhibited the conjugase activity. Citrate was also inhibitory to some extent. In contrast, extracts of cereal grain flours, whole egg, milk, cabbage, cauliflower, and lettuce caused little inhibition. Purified phytohemagglutinins, soybean trypsin inhibitors, and bovine milk folate-binding protein had no effect on the conjugase activity at the concentrations tested. The food substances that inhibited the conjugase activity did not bind the polyglutamyl folate substrate or inhibit intestinal brush border membrane sucrase and alkaline phosphatase. These findings suggest that food composition may influence folate bioavailability by interfering with the intestinal deconjugation of dietary polyglutamyl folates.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Gama-Glutamil Hidrolase
/
Inibidores de Cisteína Proteinase
/
Dieta
/
Intestinos
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Am J Clin Nutr
Ano de publicação:
1990
Tipo de documento:
Article