Mar 1, 1983

Vitamin K dependent carboxylation of glutamate residues to gamma-carboxyglutamate in microsomes from spleen and testes: comparison with liver, lung, and kidney

Biochemistry
S D Buchthal, R G Bell

Abstract

Vitamin K dependent carboxylation of glutamate residues to gamma-carboxyglutamate was demonstrated in proteins of spleen and testes microsomes. The rate of carboxylation in spleen microsomes was 0.9% and testes 3% of that in liver microsomes per milligram of microsomal protein. For comparison the rates of carboxylation in lung and kidney microsomes were 17 and 8%, respectively, of the rate in liver microsomes. The high rate in liver microsomes may be due to a high carboxylase level as indicated by the high rate of peptide carboxylation in liver microsomes. Protein carboxylation in liver microsomes was linear for only 15 min while carboxylation in microsomes from extrahepatic tissue persisted much longer so that the total protein carboxylation in lung microsomes was 60%, kidney 18%, testes 12%, and spleen 9% of that occurring in liver microsomes. Protein carboxylation was higher in microsomes from extrahepatic tissues of rats fed a vitamin K deficient diet as compared to animals fed a vitamin K sufficient diet. Protein carboxylation in microsomes from extrahepatic tissues was greatly stimulated by manganese ions and was dependent upon the addition of dithioerythritol. NADH could partially replace the dithiol in spleen, testes, a...Continue Reading

  • References12
  • Citations17

Citations

Mentioned in this Paper

Vitamin K 1
Lung
Spleen
Microsomes
August Rats
Warfarin
NADH
Kidney
Microsomes, Liver
Gamma-Carboxyglutamate

About this Paper

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