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Related Experiment Videos

G protein beta 5 subunit interactions with alpha subunits and effectors.

D M Yoshikawa1, M Hatwar, A V Smrcka

  • 1Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, New York 14642, USA.

Biochemistry
|September 14, 2000
PubMed
Summary

The beta(5)gamma(2) G protein complex was purified and shown to activate PLC beta2. Beta(5) subunits can function independently and interact with G alpha subunits.

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Evidence that a protein-protein interaction 'hot spot' on heterotrimeric G protein betagamma subunits is used for recognition of a subclass of effectors.

The EMBO journal·2001

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Protein Biochemistry

Background:

  • Heterotrimeric G proteins are crucial signal transducers.
  • Specific subunit interactions and functions are key to cellular signaling pathways.
  • Understanding G protein subunit assembly and function is vital for deciphering cellular responses.

Purpose of the Study:

  • To investigate the purification and functional characterization of the beta(5)gamma(2) G protein complex.
  • To determine the interaction of beta(5)gamma(2) with G alpha subunits.
  • To explore the effector activation specificity of the beta(5)gamma(2) complex.

Main Methods:

  • Expression of G protein subunits (beta(5), gamma(2), and hexahistidine-tagged alpha(i)) in insect cells.
  • Affinity chromatography using Ni-NTA-agarose for purification.

Related Experiment Videos

  • Anion-exchange and size-exclusion chromatography for subunit resolution and purification.
  • In vitro assembly of beta(5) and gamma(2) subunits.
  • Functional assays including PLC beta2/beta3 activation and pertussis toxin (PTX) catalyzed ADP ribosylation.

    • Main Results:

    • A functional heterotrimeric G protein complex of beta(5)gamma(2) and alpha(i) was successfully purified.
    • Purified beta(5) subunit was stable and could be reassembled with gamma(2) in vitro.
    • The reconstituted beta(5)gamma(2) complex selectively activated PLC beta2, but not PLC beta3.
    • Beta(5)gamma(2) interaction with alpha(o)-GDP was confirmed, and beta(5) competed with beta(1)gamma(2) for binding to alpha(i) and alpha(o).

    Conclusions:

    • Beta(5) subunits can be functionally assembled with gamma subunits to reconstitute G protein activity.
    • The beta(5)gamma(2) complex interacts with PTX-sensitive G alpha subunits.
    • Beta(5) subunits possess determinants for selective effector interaction, even with closely related targets.