The effect of calcium ions on subcellular localization of aldolase-FBPase complex in skeletal muscle.
In skeletal muscles, FBPase-aldolase complex is located on alpha-actinin of the Z-line. In the present paper, we show evidence that stability of the complex is regulated by calcium ions. Real time interaction analysis, confocal microscopy and the protein exchange method have revealed that elevated calcium concentration decreases association constant of FBPase-aldolase and FBPase-alpha-actinin complex, causes fast dissociation of FBPase from the Z-line and slow accumulation of aldolase within the I-band and M-line. Therefore, the release of Ca2+ during muscle contraction might result, simultaneously, in the inhibition of glyconeogenesis and in the acceleration of glycolysis.
Mamczur
Piotr
P
Department of Animal Physiology, Institute of Zoology, Wroclaw University, Cybulskiego 30, 50-205 Wroclaw, Poland.
Rakus
Dariusz
D
Gizak
Agnieszka
A
Dus
Danuta
D
Dzugaj
Andrzej
A
D000185:Actinin / Q000032:analysis / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000494:pharmacology / Q000502:physiology*; D002413:Cations, Divalent / Q000378:metabolism / Q000494:pharmacology; D006597:Fructose-Bisphosphatase / Q000032:analysis* / Q000378:metabolism; D005634:Fructose-Bisphosphate Aldolase / Q000032:analysis* / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D006019:Glycolysis / Q000502:physiology; D018613:Microscopy, Confocal; D009097:Multienzyme Complexes / Q000378:metabolism; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000187:drug effects / Q000201:enzymology*; D011817:Rabbits; D051381:Rats
D002413:Cations, Divalent; D009097:Multienzyme Complexes; D000185:Actinin; D006597:Fructose-Bisphosphatase; D005634:Fructose-Bisphosphate Aldolase; D005947:Glucose; D002118:Calcium