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Nuclear polyadenylate-binding protein.

A B Sachs, R D Kornberg

Molecular and Cellular Biology

|August 1, 1985

Summary

This summary is machine-generated.

Researchers identified conserved polyadenylate-binding proteins in rat liver, yeast, and mouse cells. These proteins, crucial for gene regulation, show distinct nuclear and cytoplasmic forms with conserved molecular weights across species.

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Area of Science:

Molecular Biology
Biochemistry
Gene Regulation

Background:

Polyadenylate-binding proteins (PAPBs) play critical roles in mRNA stability and translation.
Understanding the characteristics and conservation of PAPBs is essential for deciphering gene expression regulation.

Purpose of the Study:

To detect and characterize polyadenylate-binding activity in nuclear and cytoplasmic extracts.
To investigate the conservation of PAPBs across different species and cellular compartments.

Main Methods:

Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) combined with a nitrocellulose filter-binding assay.
Analysis of nuclear and cytoplasmic extracts from rat liver, yeast, and mouse fibroblasts.

Main Results:

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A single peak of polyadenylate-binding activity was detected in rat liver nuclear extracts (50-55 kDa) and cytoplasmic extracts (70-80 kDa).
Similar molecular weight distributions for nuclear and cytoplasmic PAPBs were observed in yeast and mouse fibroblasts, indicating high conservation.
Purified rat liver nuclear activity revealed two main bands at 53 and 55 kDa.

Conclusions:

Nuclear and cytoplasmic polyadenylate-binding proteins are highly conserved across species.
The identified PAPBs are likely involved in fundamental cellular processes related to mRNA metabolism.