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PMID: 10891509 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Assembly and preferential localization of Nup116p on the cytoplasmic face of the nuclear pore complex by interaction with Nup82p.

Molecular and cellular biology ·Vol. 20 ·No. 15 ·2000-08-00 ·Pages 5736-48

Ho AK, Shen TX, Ryan KJ, Kiseleva E, Levy MA, Allen TD, Wente SR

Abstract

The yeast Saccharomyces cerevisiae nucleoporin Nup116p serves as a docking site for both nuclear import and export factors. However, the mechanism for assembling Nup116p into the nuclear pore complex (NPC) has not been resolved. By conducting a two-hybrid screen with the carboxy (C)-terminal Nup116p region as bait, we identified Nup82p. The predicted coiled-coil region of Nup82p was not required for Nup116p interaction, making the binding requirements distinct from those for the Nsp1p-Nup82p-Nup159p subcomplex (N. Belgareh, C. Snay-Hodge, F. Pasteau, S. Dagher, C. N. Cole, and V. Doye, Mol. Biol. Cell 9:3475-3492, 1998). Immunoprecipitation experiments using yeast cell lysates resulted in the coisolation of a Nup116p-Nup82p subcomplex. Although the absence of Nup116p had no effect on the NPC localization of Nup82p, overexpression of C-terminal Nup116p in a nup116 null mutant resulted in Nup82p mislocalization. Moreover, NPC localization of Nup116p was specifically diminished in a nup82-Delta108 mutant after growth at 37 degrees C. Immunoelectron microscopy analysis showed Nup116p was localized on both the cytoplasmic and nuclear NPC faces. Its distribution was asymmetric with the majority at the cytoplasmic face. Taken together, these results suggest that Nup82p and Nup116p interact at the cytoplasmic NPC face, with nucleoplasmic Nup116p localization utilizing novel binding partners.

MeSH Terms
Cell Nucleus/metabolism,ultrastructure Cytoplasm/metabolism Fluorescent Antibody Technique Fungal Proteins/metabolism Green Fluorescent Proteins Luminescent Proteins/genetics,metabolism Membrane Proteins/genetics,metabolism Mutation Nuclear Pore Complex Proteins Nuclear Proteins/genetics,metabolism Recombinant Proteins/genetics,metabolism Saccharomyces cerevisiae/genetics,metabolism Saccharomyces cerevisiae Proteins Temperature Two-Hybrid System Techniques
Chemicals
Fungal Proteins Luminescent Proteins Membrane Proteins NUP116 protein, S cerevisiae NUP82 protein, S cerevisiae Nuclear Pore Complex Proteins Nuclear Proteins Recombinant Proteins Saccharomyces cerevisiae Proteins Green Fluorescent Proteins
Authors & Affiliations
7 authors, click to expand affiliations / ORCID
Ho A K
Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Shen T X
Ryan K J
Kiseleva E
Levy M A
Allen T D
Wente S R
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Article Info
Journal
Molecular and cellular biology
Abbr.
Mol Cell Biol
ISSN
0270-7306
DOI
10.1128/MCB.20.15.5736-5748.2000
Published
2000-08-00
Pages
5736-48
Language
English
Region
United States
NLM ID
8109087
PMCID
PMC86051
Subset
IM
Grants
Wellcome Trust · United Kingdom
External Links
PubMed source DOI: 10.1128/MCB.20.15.5736-5748.2000 PMC Full Text View journal details
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