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Nuclear protein transport is functionally conserved between yeast and higher eukaryotes

P Wagner¹, M N Hall

¹Department of Biochemistry, University of Basel, Switzerland.

|April 26, 1993

Summary

Yeast nuclear protein Mcm1 can enter frog oocyte nuclei, showing conserved nuclear transport machinery. Protein-gold complexes partially block this import, unlike nucleoplasmin.

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Area of Science:

Cell biology
Molecular biology
Genetics

Background:

Nuclear transport is crucial for eukaryotic cell function.
Understanding protein import into the nucleus is key to cellular regulation.

Purpose of the Study:

To investigate if a yeast nuclear protein can be imported into a higher eukaryotic cell nucleus.
To determine the conservation of nuclear transport machinery between yeast and higher eukaryotes.

Main Methods:

Microinjection of Mcm1 protein from Saccharomyces cerevisiae into Xenopus laevis oocytes.
Comparison of nuclear import for free proteins versus protein-gold complexes.

Main Results:

Mcm1 was successfully imported into the Xenopus oocyte nucleus.

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Protein-gold complex formation partially inactivated Mcm1's nuclear transport activity.

Nucleoplasmin demonstrated exceptional nuclear import efficiency.

Conclusions:

The nuclear transport machinery is conserved between yeast and higher eukaryotes.
Protein-gold complex formation can specifically inhibit nuclear import.
Nucleoplasmin serves as a benchmark for nuclear import studies.