Two-dimensional gel electrophoresis and FTIR spectroscopy reveal both forms of yeast plasma membrane H(+)-ATPase in activated and basal-level enzyme preparations
1.
SYSNO ASEP
0142275
Document Type
J - Journal Article
R&D Document Type
Journal Article
Subsidiary J
Ostatní články
Title
Two-dimensional gel electrophoresis and FTIR spectroscopy reveal both forms of yeast plasma membrane H(+)-ATPase in activated and basal-level enzyme preparations
Author(s)
Lapathitis, Georgios (UZFG-Y) Tanfani, F. (IT) Kotyk, Arnošt (FGU-C) Bertoli, E. (IT)
Source Title
FEBS Letters. - : Wiley
- ISSN 0014-5793
Roč. 505, č. 1 (2001), s. 155-158
Number of pages
4 s.
Language
eng - English
Country
NL - Netherlands
Keywords
H+-ATPase ; plasma membrane ; two-dimensional gel electrophoresis
Subject RIV
CE - Biochemistry
R&D Projects
GA204/98/0474 GA ČR - Czech Science Foundation (CSF)
Annotation
Plasma membrane H+-ATPase of the yeast Saccharomyces cerevisiae was isolated and purified in its two forms, the activated A-ATPase from glucose-metabolizing cells, and the basal-level B-ATPase from cells with endogenous metabolism only. Using two-dimensional gel electrophoretic analysis, we showed that both enzyme preparations are actually mixtures of the non-active, i.e. non-phosphorylated, and the active, i.e. phosphorylated, forms of the enzyme. Previous deliberations suggesting that the B-ATPase displays some activity which is lower than that of A-ATPase were apparently wrong. It seems that, molecularly speaking, the B-form is actually not active at all, and what activity we measure in our preparation is due to an admixture of the true active form (A-form). Fourier transform infrared spectroscopic study of the secondary structure and particularly thermal denaturation data suggest the possibility that the two enzyme forms interact to form complexes less stable than the single forms. On the whole then, there apparently is a different ratio of the active and inactive forms and/or complexes between the two forms present in all enzyme preparations.
