Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/26413
Title: GLFG and FxFG nucleoporins bind to overlapping sites on importin-beta.
Authors: Bayliss, R
Littlewood, T
Strawn, LA
Wente, SR
Stewart, M
First Published: 27-Dec-2002
Citation: J BIOL CHEM, 2002, 277 (52), pp. 50597-50606
Abstract: The interaction between nuclear pore proteins (nucleoporins) and transport factors is crucial for the translocation of macromolecules through nuclear pores. Many nucleoporins contain FG sequence repeats, and previous studies have demonstrated interactions between repeats containing FxFG or GLFG cores and transport factors. The crystal structure of residues 1-442 of importin-beta bound to a GLFG peptide indicates that this repeat core binds to the same primary site as FxFG cores. Importin-beta-I178D shows reduced binding to both FxFG and GLFG repeats, consistent with both binding to an overlapping site in the hydrophobic groove between the A-helices of HEAT repeats 5 and 6. Moreover, FxFG repeats can displace importin-beta or its S. cerevisiae homologue, Kap95, bound to GLFG repeats. Addition of soluble GLFG repeats decreases the rate of nuclear protein import in digitonin-permeabilized HeLa cells, indicating that this interaction has a role in the translocation of carrier-cargo complexes through nuclear pores. The binding of GLFG and FxFG repeats to overlapping sites on importin-beta indicates that functional differences between different repeats probably arise from differences in their spatial organization.
DOI Link: 10.1074/jbc.M209037200
ISSN: 0021-9258
Links: http://hdl.handle.net/2381/26413
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Biochemistry

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