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Effect of cobalamin inactivation on folate-dependent transformylases involved in purine synthesis in rats.

Authors: Deacon, R  Perry, J  Lumb, M  Chanarin, I 
Citation: Deacon R, etal., Biochem J. 1985 Apr 1;227(1):67-71.
Pubmed: (View Article at PubMed) PMID:3994693

N2O oxidizes and inactivates cob[I]alamin, and animals exposed in this way serve as models for cobalamin 'deficiency'. Such animals show a fall in activity of glycinamide ribotide transformylase and a rise in that of 5-amino-4-imidazolecarboxamide ribotide transformylase. The fall in glycinamide ribotide transformylase activity was prevented by parenteral 5'-methylthioadenosine derived from methionine. Methylthioadenosine in turn is converted into formate. Activity of glycinamide ribotide transformylase recovers after 7 days despite continued N2O inhalation, and this is probably related to restoration of methionine synthesis by induction of betaine:homocysteine transmethylase.

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CRRD Object Information
CRRD ID: 5135263
Created: 2011-07-18
Species: All species
Last Modified: 2011-07-18
Status: ACTIVE



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