Effets d'UNE Carence Sévère De Riboflavine Sur La Poule Pondeuse : Ordre De Priorité Entre Les Tissus Maternels Et l'OEUF

Abstract

SOMMAIREPrivée de riboflavine, la poule pondeuse transfère cette vitamine dans l'oeuf aux dépens deses propres tissus. Elle peut ainsi sacrifier plus de la moitié de son capital hépatique en riboflavine pour assurer la ponte. Le

Highly phosphorylated region of chicken riboflavin-binding protein: chemical characterization and phosphorus-31 NMR studies

“…What is more remarkable than any small differences in the degree of phosphorylation is the striking similarity between the two proteins. Although both proteins are coded by the same gene (Winter et al, 1967), they are made in different tissues and serve different functions (Froehlich et al, 1980;Blum, 1967; Mandeles & Ducay, 1962; Board & Fuller, 1974). There is no reason to assume that their posttranslational modifications should be identical.…”

“…This implies that posttranslational phosphorylation ]R.iboflavin in chicken egg yolk and albumen is tightly bound to a specific phosphoglycoprotein (Ostrowski et al, 1962;Rhodes et al, 1959). The riboflavin-binding protein (RBP)1 deposited in the egg yolk is synthesized in the liver and is transported by the blood to the developing ovarian follicles as are other yolk proteins (Froelich et al, 1980;Schjeide et al, 1963;Blum, 1967). The riboflavin-binding protein in egg ' From the…”