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Related Experiment Videos

Actin's N-terminal acetyltransferase uncovered.

Thomas Arnesen1,2,3, Ronen Marmorstein4, Roberto Dominguez5

  • 1Department of Biomedicine, University of Bergen, Bergen, Norway.

Cytoskeleton (Hoboken, N.J.)
|August 8, 2018
PubMed
Summary

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N-terminal acetylation of actin, crucial for cell motility and division, is now understood thanks to the identification of NAA80/NatH. This modification impacts actin assembly and protein interactions.

Area of Science:

  • Molecular and Cell Biology
  • Protein Biochemistry

Background:

  • Actin, a vital cytoskeletal protein, exists in six conserved isoforms with unique N-terminal modifications.
  • N-terminal acetylation (Nt-acetylation) of actin is a complex process involving co- and post-translational events.
  • The precise mechanism and functional significance of actin Nt-acetylation have remained largely unknown.

Purpose of the Study:

  • To elucidate the mechanism and functional consequences of actin N-terminal acetylation.
  • To identify the enzyme responsible for actin Nt-acetylation and understand its specificity.

Main Methods:

  • Identification of actin's dedicated N-terminal acetyltransferase (NAA80/NatH).
  • Analysis of NAA80 knockout cells to assess cellular phenotypes.
  • In vitro biochemical assays to study actin assembly kinetics.
Keywords:
N-terminal acetylationactin assemblycell motility

Related Experiment Videos

  • Structural biology studies of NAA80 complexed with actin peptide analogs.

    • Main Results:

    • NAA80/NatH was identified as the specific enzyme for actin Nt-acetylation.
    • NAA80 knockout cells exhibit altered cell motility, with increased filopodia and lamellipodia.
    • Nt-acetylation by NAA80 critically impacts actin assembly, affecting filament elongation and depolymerization rates.
    • Structural analysis revealed NAA80's specificity for actin's negatively charged N-terminus, with acetylation neutralizing a positive charge.

    Conclusions:

    • NAA80/NatH plays a critical role in regulating actin dynamics and cell motility through N-terminal acetylation.
    • Actin Nt-acetylation neutralizes a positive charge at the N-terminus, influencing protein interactions.
    • These findings provide a foundation for understanding the diverse functional roles of actin Nt-acetylation.