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Related Experiment Videos

Functional differences between human formyl peptide receptor isoforms 26, 98, and G6.

Katharina Wenzel-Seifert1, Roland Seifert

  • 1Department of Pharmacology and Toxicology, The University of Kansas, Malott Hall, Room 5064, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582, USA.

Naunyn-Schmiedeberg'S Archives of Pharmacology
|April 8, 2003
PubMed
Summary

Formyl peptide receptor (FPR) isoforms 98 and G6 show impaired G(i)-protein coupling compared to FPR-26. Amino acid E346 is crucial for FPR-26

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Formyl peptide receptors (FPRs) are crucial for neutrophil function, mediating chemotaxis and cytotoxic responses via G(i)-protein coupling.
  • Distinct FPR isoforms (26, 98, G6) vary in amino acid sequences at positions 101, 192, and 346, but the functional impact remains unclear.

Purpose of the Study:

  • To investigate the functional significance of structural differences between FPR isoforms 26, 98, and G6.
  • To determine the role of specific amino acid residues in FPR activity, G(i)-protein coupling, and physical state.

Main Methods:

  • Recombinant FLAG-tagged FPR isoforms were co-expressed with G(i)alpha(2)beta(1)gamma(2) in Sf9 insect cells.
  • High-affinity agonist binding and guanosine 5'-O-(3-thiotriphosphate) (GTPgammaS) binding assays were performed.

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  • SDS-PAGE was used to analyze the physical state (monomer, dimer, tetramer) of FPR isoforms.

    • Main Results:

    • FPR-98 and FPR-G6 exhibited significantly lower B(max) values for agonist binding and activated fewer G(i)-proteins compared to FPR-26.
    • FPR-98 and FPR-G6 showed reduced constitutive activity and migrated as dimers/tetramers, unlike FPR-26 which migrated as a monomer.
    • Amino acid E346 in FPR-26 was identified as critical for its monomeric state, high constitutive activity, and G(i)-protein coupling.

    Conclusions:

    • FPR isoforms 98 and G6 possess a partial G(i)-protein coupling defect relative to FPR-26.
    • The amino acid residue E346 critically influences the constitutive activity, G(i)-protein coupling efficiency, and quaternary structure of FPR-26.