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Related Experiment Videos

A synthetic peptide substrate for initiation factor-2 kinases.

H Mellor1, C G Proud

  • 1Department of Biochemistry, School of Medical Sciences, University of Bristol, U.K.

Biochemical and Biophysical Research Communications
|July 31, 1991
PubMed
Summary

A synthesized peptide from eIF-2 alpha was phosphorylated by heme-controlled repressor (HCR), double-stranded RNA-dependent inhibitor (dsI), and protein kinase C (PKC). Phosphorylation occurred specifically at serine-51, showing sigmoidal kinetics with dsI and HCR kinases.

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Area of Science:

  • Molecular Biology
  • Protein Kinase Research

Background:

  • Eukaryotic initiation factor 2 (eIF-2) alpha subunit plays a critical role in translational control.
  • Phosphorylation of eIF-2 alpha by specific kinases regulates protein synthesis.
  • Understanding the substrate specificity and kinetics of eIF-2 alpha kinases is crucial for deciphering translational regulation.

Purpose of the Study:

  • To synthesize a peptide representing residues 45-56 of eIF-2 alpha.
  • To investigate the phosphorylation of this peptide by known eIF-2 alpha kinases and other protein kinases.
  • To characterize the kinetics of peptide phosphorylation by specific kinases.

Main Methods:

  • Peptide synthesis of eIF-2 alpha residues 45-56 (sequence: ILLSELSRRRIR).
  • In vitro phosphorylation assays using heme-controlled repressor (HCR), double-stranded RNA-dependent inhibitor (dsI), and protein kinase C (PKC).

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  • Kinetic analysis of phosphorylation reactions.

    • Main Results:

    • The synthesized peptide P(45-56) was phosphorylated by HCR and dsI.
    • Protein kinase C (PKC) also phosphorylated P(45-56), dependent on phosphatidylserine.
    • Phosphorylation by HCR, dsI, and PKC occurred exclusively at the serine residue corresponding to serine-51 of eIF-2 alpha.
    • Phosphorylation kinetics with dsI and HCR were sigmoidal with respect to substrate concentration.

    Conclusions:

    • The peptide P(45-56) serves as a specific substrate for eIF-2 alpha kinases HCR and dsI, as well as for PKC.
    • Serine-51 is the primary site of phosphorylation by these kinases.
    • Sigmoidal kinetics suggest potential cooperative mechanisms or multi-step phosphorylation processes involving these kinases.