Calcium binding to polypeptides of rat liver and Zajdela hepatoma mitochondrial inner membranes

Composition and amount of 45Ca 2+-binding proteins in the inner membrane fraction of rat liver and Zajdela hepatoma mitochondria were determined. In the inner membrane of liver mitochondria, three major 45Ca 2+-binding polypeptides: a protein of ∼130 kDa (carbamoyl-phosphate synthetase), a glycoprot...

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Veröffentlicht in:FEBS letters 1998-02, Vol.423 (1), p.45-48
Hauptverfasser: Evtodienko, Yuri V, Azarashvili, Tamara S, Kudin, Alexei P
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Azarashvili, Tamara S
Kudin, Alexei P
description Composition and amount of 45Ca 2+-binding proteins in the inner membrane fraction of rat liver and Zajdela hepatoma mitochondria were determined. In the inner membrane of liver mitochondria, three major 45Ca 2+-binding polypeptides: a protein of ∼130 kDa (carbamoyl-phosphate synthetase), a glycoprotein of 43–44 kDa (previously considered as the calcium uniporter), and 29–30 kDa protein were found. These components were absent (130 kDa component) or relatively reduced (43–44 kDa and 29–30 kDa components) in the inner membrane of hepatoma mitochondria. Previously unknown low molecular mass polypeptides, having very high Ca 2+-binding ability, were found in the inner membrane of hepatoma mitochondria. One of them might be the natural Ca 2+-binding inhibitor of H +-ATPase.
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subjects Animals
Ca 2+-binding protein
Ca2+-binding protein
CaBI, Ca2+-binding inhibitor protein of H+-ATPase
Calcium-Binding Proteins - analysis
Carcinoma, Hepatocellular
Cells, Cultured
Hepatoma cell
IMM, inner mitochondrial membrane
Intracellular Membranes - chemistry
Liver - chemistry
Liver - cytology
Liver cell
LMM CaBP, low molecular mass Ca2+-binding protein
Male
Membrane Proteins - analysis
Mitochondria - chemistry
Mitochondrion
Peptides - analysis
PTP, permeability transition pore
Rats
Rats, Wistar
Tumor Cells, Cultured
title Calcium binding to polypeptides of rat liver and Zajdela hepatoma mitochondrial inner membranes
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