Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria.

Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria. Research Abstract Details 

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Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria. Abstract Text:

T Hashimoto,Y Yoshida,K Tagawa,

Yeast mitochondrial ATP synthase has three regulatory proteins, ATPase inhibitor, 9K protein, and 15K protein. The 9K protein binds directly to purified F1-ATPase, as does the ATPase inhibitor, but the 15K protein does not [Hashimoto, T. et al. (1987) J. Biochem. 102, 685-692]. In the present study, we found that 15K protein bound to purified F1F0-ATPase, forming an equimolar complex with the enzyme. The apparent dissociation constant was calculated to be 1.4 x 10(-5) M. The ATPase inhibitor and 9K protein also bound to F1F0-ATPase in the presence of ATP and Mg2+, and the dissociation constants of their bindings were about 3 X 10(-6) M. They bound to the enzyme competitively in the absence of 15K protein, but in its presence, they bound in equimolar amounts to the enzyme. The ATP-hydrolyzing activity of the enzyme-ligand complex was greatly influenced by the order of bindings of ATPase inhibitor and 9K protein: when the ATPase inhibitor was bound first, the activity of the enzyme was inhibited completely and was not restored by 9K protein, but when 9K protein was added first, the activity was inhibited only partially even after equimolar binding of the ATPase inhibitor to the enzyme. These observations strongly suggest that the 15K protein binds to the F0 part and functions to hold the ATPase inhibitor or 9K protein on the F1 subunit.

Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria. Publishing Authors By Initials

T Hashimoto,Y Yoshida,K Tagawa,

For similar fungi: yeasts research abstracts see: fungi: yeasts research

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Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of biochemistry

VOLUME: 108

Page Numbers: 17-20

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Jul

YEAR: 1990

Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria. Information

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LANGUAGE: eng

NlmUniqueID: 376600

Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria. Keywords Mesh Terms:

KEYWORDS: Yeasts

MESH TERMS: enzymology

Chemical & Substance for Abstract: Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria. Information

Substance Name: Proton-Translocating ATPases

Registry Number: EC 3.6.3.14

Grant and Affiliation Information for Simultaneous bindings of ATPase inhibitor and 9K protein to F1F0-ATPase in the presence of 15K protein in yeast mitochondria.

AFFILIATION: Department of Physiological Chemistry, Medical School, Osaka University.

Country: JAPAN

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MEDLINETA: J Biochem

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