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Complexes between porin, hexokinase, mitochondrial creatine kinase and adenylate translocator display properties of the permeability transition pore. Implication for regulation of permeability transition by the kinases
Open accessAbstract
Complexes between hexokinase, outer membrane porin, and the adenylate translocator (ANT) were recently found to establish properties of the mitochondrial permeability transition pore in a reconstituted system. The complex was extracted by 0.5% Triton X-100 from rat brain membranes and separated by anion exchanger chromatography. The molecular weight was approximately 400 kDa suggesting tetramers of hexokinase (monomer 100kDa). By the same method a porin, creatine kinase octamer, ANT complex was isolated and reconstituted in liposomes. Vesicles containing the reconstituted complexes both retained ATP that could be used by either kinase to phosphorylate external creatine or glucose. Atractyloside inhibited this activity indicating that the ANT was involved in this process and was functionally reconstituted. Exclusively from the hexokinase complex containing liposome internal malate or ATP was released by addition of Ca2+ in a N-methylVal-4-cyclosporin sensitive way, suggesting that the hexokinase porin ANT complex might include the permeability transition pore (PTP). The Ca2+ dependent opening of the PTP-like structure was inhibited by ADP (apparent I(50), 8 microM) and ATP (apparent I(50), 84 microM). Also glucose inhibited the PTP-like activity, while glucose-6-phosphate abolished this effect. Although porin and ANT were functionally active in vesicles containing the creatine kinase octamer complex, Ca2+ did not induce a release of internal substrates. However, after dissociation of the creatine kinase octamer, the complex exhibited PTP-like properties and the vesicles liberated internal metabolites upon addition of Ca2+. The latter process was also inhibited by N-methylVal-4-cyclosporin. The activity of peptidyl-prolyl-cis-trans-isomerase (representing cyclophilin) was followed during complex isolation. Cyp D was co-purified with the hexokinase complex, while it was absent in the creatine kinase complex. The inhibitory effect of N-methylVal-4-cyclosporin on the creatine kinase complex may be explained by direct interaction with the creatine kinase dimer that appeared to support octamer formation.
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Metadata
- Authors
- Beutner, G., Rück, A., Riede, B., & Brdiczka, D.
- Venue
- Biochimica et Biophysica Acta (BBA) - Biomembranes
- Publisher
- Elsevier BV
- Published
- 1998-01
- Volume
- 1368
- Issue
- 1
- Pages
- 7-18
- ISSN
- 0005-2736 (ISSN-L)
- OpenAlex
- W1967203467
- Cited by
- 342
- References
- 0
- FWCI
- 8.33
- Type
- journal article
- Language
- en
- Open access
- bronze
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