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Minimal nuclear pore complexes define FG repeat domains essential for transport.
Lisa A Strawn1, Tianxiang Shen, Nataliya Shulga
1Department of Cell and Developmental Biology, Vanderbilt University Medical Center, 3120A MRBIII, 465 21st Avenue South, Nashville, TN 37232-8240, USA.
Nature Cell Biology
|March 25, 2004
Summary
Researchers explored nuclear pore complex (NPC) protein interactions by deleting phenylalanine-glycine (FG) domains in yeast. Specific symmetric FG-Nup deletions were essential, revealing multiple NPC translocation pathways.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Nuclear pore complexes (NPCs) regulate transport between the nucleus and cytoplasm.
- Translocation relies on interactions between receptor-cargo complexes and phenylalanine-glycine (FG) repeats within FG-Nups.
Purpose of the Study:
- To investigate the essentiality and function of FG domains in Saccharomyces cerevisiae FG-Nups.
- To determine the impact of FG domain deletions on NPC structure and transport.
Main Methods:
- Systematic deletion of FG domains from 11 Saccharomyces cerevisiae FG-Nups in various combinations.
- Assessing viability, NPC permeability barrier, and import rates of specific karyopherins (Kap).
Main Results:
- Deletion of all five asymmetrically localized FG domains was non-essential.
- Specific combinations of symmetrically localized FG domains were found to be essential.
- Over 50% of FG domain mass could be deleted without affecting viability or the NPC permeability barrier.
- Symmetric deletions mildly reduced Kap95-Kap60 import but abolished Kap104 import.
Conclusions:
- The results suggest that NPC translocation is mediated by multiple pathways.
- Symmetric FG-Nup domains play critical, distinct roles in nucleocytoplasmic transport.