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Related Experiment Videos

Polyomavirus middle T-antigen NPTY mutants.

B J Druker1, L Sibert, T M Roberts

  • 1Division of Cellular and Molecular Biology, Dana-Farber Cancer Institute, Boston, Massachusetts.

Journal of Virology
|October 1, 1992
PubMed
Summary
This summary is machine-generated.

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The polyomavirus middle T-antigen (MTAg) NPTY sequence is crucial for cell transformation. Mutations within this motif render MTAg transformation-defective, highlighting its role as a functional unit.

Area of Science:

  • Virology
  • Molecular Biology
  • Cellular Biology

Background:

  • Polyomavirus middle T-antigen (MTAg) is essential for viral transformation.
  • A previously studied MTAg mutant (Pro-248 to Leu-248) was transformation-defective without altering associated proteins or kinase activities.
  • The Pro-248 residue is located within a tetrameric sequence, NPTY, analogous to the NPXY motif in the low-density-lipoprotein receptor.

Purpose of the Study:

  • To investigate whether the NPTY sequence in MTAg functions as a critical motif for cell transformation.
  • To determine the impact of specific amino acid substitutions within the NPTY motif on MTAg's transforming capabilities.

Main Methods:

  • Construction and analysis of a series of single amino acid substitution mutants within the NPTY region of MTAg.

Related Experiment Videos

  • Assay of associated proteins and kinase activities in vitro for transformation-defective mutants.
  • Restoration of transforming abilities by inserting the NPTY sequence downstream of mutated motifs.

    • Main Results:

    • All mutations within the NPTY sequence (N, P, T, Y), including conservative substitutions, resulted in a transformation-defective MTAg.
    • Mutations outside the NPTY sequence did not significantly impair MTAg's transformation capabilities.
    • Transformation-defective mutants retained wild-type levels of associated proteins and activities in vitro.
    • Re-insertion of the NPTY sequence restored transforming ability to the mutated MTAg.

    Conclusions:

    • The tetrameric NPTY sequence represents a well-defined and essential functional motif in polyomavirus middle T-antigen.
    • Disruption of the NPTY motif abolishes MTAg's transforming activity, likely through mechanisms distinct from alterations in associated proteins or kinase activities.