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Related Experiment Videos

Murine cDNAs coding for the centrosomal antigen centrosomin A.

G Joswig1, C Petzelt, D Werner

  • 1Institute of Cell and Tumor Biology, German Cancer Research Center, Heidelberg, FRG.

Journal of Cell Science
|January 1, 1991
PubMed
Summary

Researchers identified centrosomin A, a protein crucial for centrosome structure and function, by screening a cDNA library. This discovery provides new insights into centrosome biology and potential roles in cell division.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Centrosomes are vital organelles regulating cell division and organization.
  • Specific antibodies (GP1) recognize conserved centrosomal antigens across species.
  • Previous characterization of these antigens was limited.

Purpose of the Study:

  • To isolate and characterize cDNA clones encoding centrosome-specific antigens.
  • To identify the protein product recognized by the GP1 antibody.
  • To investigate the relationship between different forms of the antigen.

Main Methods:

  • Screening of an Ehrlich ascites cell cDNA library using the GP1 antibody.
  • Expression of cloned cDNA in E. coli for antigen production and antibody generation.

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  • Plaque hybridization and DNA sequencing to analyze cDNA clones.
  • Restriction enzyme mapping and cross-hybridization to compare cDNA inserts.
  • Western blot analysis to detect protein antigens.

    • Main Results:

    • A partial cDNA clone (lambda P10A) encoding a centrosome-specific antigen was isolated.
    • Two types of full-length cDNA clones (PN1 and PN5) were identified, both encoding a 34.5 kDa polypeptide named centrosomin A.
    • Centrosomin A exhibits sequence identity with nuclear lamins A/C and lamin B.
    • A larger antigen, centrosomin B, was detected but not cloned.

    Conclusions:

    • Centrosomin A is a novel, highly charged, hydrophilic protein localized to the centrosome.
    • The identified cDNA clones represent centrosomin A, a component of centrosomal antigens recognized by GP1.
    • The relationship between centrosomin A and the larger centrosomin B requires further investigation.