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Related Experiment Videos

The late pollen-specific actins in angiosperms.

M K Kandasamy1, E C McKinney, R B Meagher

  • 1Department of Genetics, Life Science Building, University of Georgia, Athens 30602, USA.

The Plant Journal : for Cell and Molecular Biology
|July 27, 1999
PubMed
Summary

Researchers developed a new antibody to study actin diversity in Arabidopsis. This antibody specifically targets reproductive actins in pollen, revealing evolutionary insights into plant fertilization.

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Area of Science:

  • Plant molecular biology
  • Cell biology
  • Evolutionary biology

Background:

  • The Arabidopsis actin gene family exhibits diversity with vegetative and reproductive classes.
  • Distinguishing highly conserved actin subclasses biochemically and cellularly is challenging.
  • Understanding actin isovariant function requires specific molecular tools.

Purpose of the Study:

  • To develop novel monoclonal antibodies for distinguishing Arabidopsis actin subclasses.
  • To investigate the functional diversity of actin isovariants, particularly in reproductive tissues.
  • To explore the evolutionary origins of specific actin epitopes.

Main Methods:

  • Production of anti-actin monoclonal antibodies using Arabidopsis recombinant actins.
  • Immunoblot analysis to detect actin subclass specificity in various tissues.

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  • Immunocytochemical studies to visualize actin filaments in pollen tubes and vegetative tissues.
  • Peptide competition assays to identify the epitope responsible for antibody specificity.

    • Main Results:

    • A novel monoclonal antibody, MAb45a, specifically recognizes two closely related reproductive actin subclasses.
    • MAb45a strongly reacts with actins in mature pollen but not other Arabidopsis tissues.
    • Immunocytochemistry reveals distinct actin filament localization in pollen tubes compared to vegetative tissues.
    • The Asn79 epitope is crucial for MAb45a specificity and is conserved in angiosperm and advanced gymnosperm pollen.

    Conclusions:

    • MAb45a is a valuable tool for distinguishing reproductive actin subclasses in Arabidopsis.
    • The Asn79 epitope likely emerged in an ancestor common to angiosperms and advanced gymnosperms over 220 million years ago.
    • A developmental switch to reproductive actins occurs during late angiosperm pollen development, potentially for fertilization functions.