The glycine-rich sequence of the β subunit of Escherichia coli H+-ATPase is important for activity

M. Takeyama, K. Ihara, Y. Moriyama, T. Noumi, K. Ida, N. Tomioka, A. Itai, M. Maeda, M. Futai

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Abstract

A short sequence motif rich in glycine residues, Gly-X-X-X-X-Gly-Lys-Thr/Ser, has been found in many nucleotide-binding proteins including the β subunit of Escherichia coli H+-ATPase (Gly-Gly-Ala-Gly-Val-Gly-Lys-Thr, residues 149-156). The following mutations were introduced in this region of the cloned E. coli unc operon carried by a plasmid pBWU1: Ala-151 → Pro or Val; insertion of a Gly residue between Lys-155 and Thr-156; and replacement of the region by the corresponding sequence of adenylate kinase (Gly-Gly-Pro-Glyu-Ser-Gly-Lys-Gly-Thr) or p21 ras protein (ras) (Gly-Ala-Gly-Gly-Val-Gly-Lys-Ser). All F0F1 subunits were synthesized in the deletion strain of the unc operon-dependent on pBWU1 with mutations, and essentially the same amounts of H+-ATPase with these mutant β subunits were found in membranes. The adenylate kinase and Gly insertion mutants showed no oxidative phosphorylation or ATPase activity, whereas the Pro-151 mutants had higher ATPase activity than the wild-type, and the Val-151 and ras mutants had significant activity. It is striking that the enzyme with the ras mutation (differing in three amino acids from the β sequence) had about half the membrane ATPase activity of the wild-type. These results together with the simulated three-dimensional structures of the wild-type and mutant sequences suggest that in mutant β subunits with no ATPase activity projection of Thr-156 residues was opposite to that in the wild-type, and that the size and direction of projection of residue 151 are important for the enzyme activity.

Original languageEnglish
Pages (from-to)21279-21284
Number of pages6
JournalJournal of Biological Chemistry
Volume265
Issue number34
Publication statusPublished - Dec 1 1990

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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    Takeyama, M., Ihara, K., Moriyama, Y., Noumi, T., Ida, K., Tomioka, N., Itai, A., Maeda, M., & Futai, M. (1990). The glycine-rich sequence of the β subunit of Escherichia coli H+-ATPase is important for activity. Journal of Biological Chemistry, 265(34), 21279-21284.