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The integral membrane protein snl1p is genetically linked to yeast nuclear pore complex function
A K Ho1, G A Raczniak, E B Ives
1Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Molecular Biology of the Cell
|April 4, 1998
Summary
A novel integral membrane protein, Snl1p, stabilizes nuclear pore complex (NPC) structure and function. Its expression rescues lethal NPC defects, revealing new insights into nucleocytoplasmic transport mechanisms.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Integral membrane proteins are crucial for nuclear pore complex (NPC) biogenesis and function.
- Understanding NPC assembly is key to deciphering nucleocytoplasmic transport mechanisms.
Purpose of the Study:
- To identify factors involved in nuclear pore complex (NPC) function by screening for suppressors of a lethal Nup116p mutant phenotype.
- To characterize a novel protein, SNL1, and its role in NPC structure and function.
Main Methods:
- Genetic screening for high-copy suppressors of the lethal nup116-C phenotype in yeast.
- Indirect immunofluorescence microscopy and subcellular fractionation to determine Snl1p localization.
- Membrane extraction and topology assays to define Snl1p as an integral membrane protein.
Main Results:
- A novel gene, SNL1, was identified as a suppressor of the lethal nup116-C phenotype.
- Snl1p, an 18.3 kDa integral membrane protein, localizes to the nuclear envelope and endoplasmic reticulum.
- High-copy SNL1 suppressed lethality and genetic interactions with other NPC components (GLE2, NIC96).
Conclusions:
- Snl1p plays a critical role in nuclear pore complex (NPC) structure and function.
- Snl1p likely acts as a stabilizing factor within the NPC.
- This study establishes genetic links between Snl1p and other NPC-associated proteins, advancing our understanding of nucleocytoplasmic transport.