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PMID:16542652

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Citation

Arden, C, Baltrusch, S and Agius, L (2006) Glucokinase regulatory protein is associated with mitochondria in hepatocytes. FEBS Lett. 580:2065-70

Abstract

The association of glucokinase with liver mitochondria has been reported [Danial et al. (2003) BAD and glucokinase reside in a mitochondrial complex that integrates glycolysis and apoptosis. Nature 424, 952-956]. We confirmed association of glucokinase immunoreactivity with rat liver mitochondria using Percoll gradient centrifugation and demonstrated its association with the 68 kDa regulatory protein (GKRP) but not with the binding protein phosphofructokinase-2/fructose bisphosphatase-2. Substrates and glucagon induced adaptive changes in the mitochondrial glucokinase/GKRP ratio suggesting a regulatory role for GKRP. Combined with previous observations that GKRP overexpression partially inhibits glycolysis [de la Iglesia et al. (2000) The role of the regulatory protein of glucokinase in the glucose sensory mechanism of the hepatocyte. J. Biol. Chem. 275, 10597-10603] these findings suggest that there may be distinct glycolytic pools of glucokinase.

Links

PubMed Online version:10.1016/j.febslet.2006.03.009

Keywords

Animals; Carrier Proteins/metabolism; Cell Nucleus/metabolism; Cells, Cultured; Fructose-Bisphosphatase/metabolism; Fructosephosphates/metabolism; Glucagon/pharmacology; Glucokinase/metabolism; Hepatocytes/cytology; Hepatocytes/drug effects; Hepatocytes/enzymology; Hepatocytes/metabolism; Hexokinase/metabolism; Male; Mitochondria, Liver/drug effects; Mitochondria, Liver/enzymology; Mitochondria, Liver/metabolism; Phosphofructokinase-2/metabolism; Protein Binding; Protein Transport/drug effects; Rats; Rats, Wistar; Substrate Specificity

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

RAT:HXK4

part_of

GO:0005829: cytosol

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

RAT:HXK4

part_of

GO:0005739: mitochondrion

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

RAT:GCKR

part_of

GO:0005739: mitochondrion

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

RAT:GCKR

part_of

GO:0005829: cytosol

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete


See also

References

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