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Related Experiment Videos

A novel 53-kDa polypeptide from chicken embryo.

J A Bassuk1, R A Berg

  • 1Department of Biochemistry, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, Piscataway 08854.

The Journal of Biological Chemistry
|December 15, 1991
PubMed
Summary

Researchers discovered a new 53-kDa protein in chicken embryos with PDI-like properties. This protein, distinct from PDI, shows unique sequences and insulin disulfide cleavage activity, suggesting a family of PDI-like proteins.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Chemistry

Background:

  • Protein disulfide isomerase (PDI) plays crucial roles in protein folding and redox homeostasis.
  • Previous studies suggested PDI's involvement in various cellular processes.
  • The existence of PDI-like proteins and their functions remain incompletely understood.

Purpose of the Study:

  • To isolate and characterize a novel protein from chicken embryos with properties similar to PDI.
  • To investigate the relationship between this novel protein and known PDI and prolyl 4-hydroxylase beta-subunit.
  • To determine the enzymatic activity and sequence homology of the novel protein.

Main Methods:

  • Purification of the 53-kDa protein using ion-exchange chromatography.
  • Immunological cross-reactivity assays using antibodies against bovine PDI and chicken PDI/prolyl 4-hydroxylase beta-subunit.

Related Experiment Videos

  • Amino acid composition analysis and N-terminal Edman degradation.
  • Cyanogen bromide fragmentation and sequence analysis.
  • Insulin disulfide cleavage assay and periodic acid-Schiff staining.

    • Main Results:

    • A novel 53-kDa protein was isolated, copurifying with PDI but separable by ion-exchange chromatography.
    • The 53-kDa protein exhibited distinct immunological and sequence characteristics compared to PDI and chicken prolyl 4-hydroxylase beta-subunit.
    • Amino acid analysis and N-terminal sequencing revealed unique data, with a fragment matching human beta-endorphin.
    • The 53-kDa protein demonstrated insulin disulfide cleavage activity, similar to PDI, but lacked detectable carbohydrate.
    • Evidence supports the existence of a family of PDI-like proteins in chicken embryos.

    Conclusions:

    • A novel 53-kDa PDI-like protein exists in chicken embryos, distinct from PDI and the prolyl 4-hydroxylase beta-subunit.
    • This protein possesses unique biochemical and sequence properties, including enzymatic activity.
    • The findings suggest that PDI activity is not limited to a single protein in chicken embryos, expanding the known repertoire of PDI-like proteins.