Molecular interactions of yeast frequenin (Frq1) with the phosphatidylinositol 4-kinase isoform, Pik1

Inken G. Huttner, Thomas Strahl, Masanori Osawa, David S. King, James B. Ames, Jeremy Thorner

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Frq1, a 190-residue N-myristoylated calcium-binding protein, associates tightly with the N terminus of Pik1, a 1066-residue phosphatidylinositol 4-kinase. Deletion analysis of an Frq1-binding fragment, Pik1-(10-192), showed that residues within 80-192 are necessary and sufficient for Frq1 association in vitro. A synthetic peptide (residues 151-199) competed for binding of [35S]Pik1-(10-192) to bead-immobilized Frq1, whereas shorter peptides (164-199 and 174-199) did not. Correspondingly, a deletion mutant, Pik1(Δ152-191), did not co-immunoprecipitate efficiently with Frq1 and did not support growth at elevated temperature. Site-directed mutagenesis of Pik1-(10-192) suggested that recognition determinants lie over an extended region. Titration calorimetry demonstrated that binding of an 83-residue fragment, Pik1-(110-192), or the 151-199 peptide to Frq1 shows high affinity (Kd ∼100 nM) and is largely entropic, consistent with hydrophobic interaction. Stoichiometry of Pik1-(110-192) binding to Frq1 was 1:1, as judged by titration calorimetry, by changes in NMR spectrum and intrinsic tryptophan fluorescence, and by light scattering. In cell extracts, Pik1 and Frq1 exist mainly in a heterodimeric complex, as shown by size exclusion chromatography. Cys-15 in Frq1 is not S-palmitoylated, as assessed by mass spectrometry; a Frq1(C15A) mutant and even a non-myristoylated Frq1(G2A,C15A) double mutant rescued the inviability of frq1Δ cells. This study defines the segment of Pik1 required for high affinity binding of Frq1.

Original languageEnglish
Pages (from-to)4862-4874
Number of pages13
JournalJournal of Biological Chemistry
Volume278
Issue number7
DOIs
Publication statusPublished - 2003 Feb 14
Externally publishedYes

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1-Phosphatidylinositol 4-Kinase
Molecular interactions
Yeast
Protein Isoforms
Calorimetry
Yeasts
Titration
Peptides
Mutagenesis
Calcium-Binding Proteins
Size exclusion chromatography
Site-Directed Mutagenesis
Cell Extracts
Hydrophobic and Hydrophilic Interactions
Tryptophan
Stoichiometry
Light scattering
Gel Chromatography
Mass spectrometry
Mass Spectrometry

ASJC Scopus subject areas

  • Biochemistry

Cite this

Molecular interactions of yeast frequenin (Frq1) with the phosphatidylinositol 4-kinase isoform, Pik1. / Huttner, Inken G.; Strahl, Thomas; Osawa, Masanori; King, David S.; Ames, James B.; Thorner, Jeremy.

In: Journal of Biological Chemistry, Vol. 278, No. 7, 14.02.2003, p. 4862-4874.

Research output: Contribution to journalArticle

Huttner, Inken G. ; Strahl, Thomas ; Osawa, Masanori ; King, David S. ; Ames, James B. ; Thorner, Jeremy. / Molecular interactions of yeast frequenin (Frq1) with the phosphatidylinositol 4-kinase isoform, Pik1. In: Journal of Biological Chemistry. 2003 ; Vol. 278, No. 7. pp. 4862-4874.
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