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Updated: Aug 14, 2026

Isolation of F1-ATPase from the Parasitic Protist Trypanosoma brucei
Published on: January 22, 2019
Isolated epsilon subunit of Bacillus subtilis F1-ATPase binds ATP
1Department of Life Sciences and Frontier Project Life's Adaptation Strategies to Environmental Changes, College of Science, Rikkyo (St. Paul's) University, 3-34-1, Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan. katoyama@rikkyo.ac.jp
Abstract:
Previously, we demonstrated ATP binding to the isolated epsilon subunit of F1-ATPase from thermophilic Bacillus PS3 [Kato-Yamada Y., Yoshida M. (2003) J. Biol. Chem. 278, 36013]. However, whether it is a general feature of the epsilon subunit from other sources is yet unclear. Here, using a sensitive method to detect weak interactions between fluorescently labeled epsilon subunit and nucleotide, it was shown that the epsilon subunit of F1-ATPase from Bacillus subtilis also bound ATP. The dissociation constant for ATP binding at room temperature was calculated to be 2 mM, which may be suitable for sensing cellular ATP concentration in vivo.
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