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Transport between the cell nucleus and the cytoplasm
1Zentrum für Molekulare Biologie, Universität Heidelberg, Federal Republic of Germany. dg@mail.zmbh.uni-heidelberg.de
Annual Review of Cell and Developmental Biology
|December 28, 1999
Summary
Eukaryotic cells use nuclear pore complexes for protein import and RNA/ribosome export. Nuclear transport receptors, often importin beta-related, mediate these pathways, working with the RanGTPase system.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Eukaryotic cells possess a nucleus requiring regulated transport of molecules between the cytoplasm and nucleoplasm.
- Nuclear pore complexes (NPCs) are the gateways for this molecular traffic, facilitating both import and export.
- Specific transport receptors mediate the movement of cargo across the nuclear envelope.
Purpose of the Study:
- To review the mechanisms and pathways of nuclear import and export in eukaryotic cells.
- To focus on the role of importin beta-related nuclear transport receptors and the RanGTPase system.
- To discuss nuclear export pathways, particularly for messenger RNA, and their distinct mediators.
Main Methods:
- Literature review of nuclear transport mechanisms.
- Detailed description of various nuclear import and export pathways.
- Analysis of the function and energetics of transport receptors.
Main Results:
- Nuclear import and export involve numerous distinct pathways mediated by transport receptors.
- Importin beta-related receptors and the RanGTPase system are crucial for cargo transport.
- Nuclear export of messenger RNA appears to utilize mediators distinct from importin beta-related factors.
Conclusions:
- Nuclear transport is a complex, regulated process essential for eukaryotic cell function.
- Understanding transport receptor function and the RanGTPase system provides insight into cellular compartmentalization.
- Distinct mechanisms govern nuclear import and export, highlighting the specificity of molecular trafficking.