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Nuclear protein accumulation by facilitated transport and intranuclear binding
1Laboratory of Intracellular Biophysics, Department of Biological Sciences, St John's University, 8000 Utopia Parkways, Jamaica, NY 11439, USA.
Trends in Cell Biology
|October 1, 1993
Summary
Nuclear protein transport into the nucleus via nuclear pore complexes (NPCs) may be explained by facilitated transport and intranuclear binding, not just active transport. This challenges current understanding of nucleocytoplasmic transport mechanisms.
Area of Science:
- Cell Biology
- Molecular Biology
- Biophysics
Background:
- Nuclear proteins are translocated from the cytoplasm into the nucleus through nuclear envelope pore complexes (NPCs).
- The precise molecular mechanisms governing this transport are not fully understood.
- This process often requires ATP and moves against significant concentration gradients, leading to the prevailing view of NPCs as active transport sites.
Purpose of the Study:
- To propose an alternative hypothesis for nuclear protein transport.
- To explain protein translocation and nuclear accumulation using a facilitated transport model.
Main Methods:
- Review and re-evaluation of existing evidence on nuclear protein transport.
- Hypothesis formulation based on current data.
Main Results:
- The study presents a hypothesis that challenges the established active transport model for NPCs.
- It suggests that facilitated transport through the NPC coupled with intranuclear binding can account for observed protein movement and accumulation.
Conclusions:
- The current evidence does not exclusively support active transport as the sole mechanism for nuclear protein import.
- Facilitated transport offers an equally plausible explanation for the translocation and accumulation of proteins within the nucleus.