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Crystallization and preliminary X‐ray characterization of the Skp1–Fbg3 complex

Crystallization and preliminary X‐ray characterization of the Skp1–Fbg3 complex F‐box proteins are the substrate‐recognition components of Skp1–Cullin1–F‐box protein–Rbx1 (SCF) ubiquitin ligase complexes. Fbs1, an F‐box protein, binds specifically to proteins modified with high‐mannose oligosaccharides. Fbg3, another F‐box protein, has 51% sequence identity to Fbs1. Although the residues that are necessary for binding to oligosaccharides are conserved between Fbs1 and Fbg3, Fbg3 does not bind glycoproteins. Skp1 and Fbg3 were co‐expressed in Escherichia coli and their complex was purified to homogeneity and crystallized. Microseeding combined with the sandwiched hanging‐drop technique improved the quality of the resulting crystals. The plate‐shaped crystals belonged to space group P212121, with unit‐cell parameters a = 34.1, b = 76.6, c = 193.9 Å and one molecule per asymmetric unit. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section F Wiley

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References (16)

Publisher
Wiley
Copyright
International Union of Crystallography, 2010
ISSN
1744-3091
eISSN
1744-3091
DOI
10.1107/S1744309109050581
pmid
20057081
Publisher site
See Article on Publisher Site

Abstract

F‐box proteins are the substrate‐recognition components of Skp1–Cullin1–F‐box protein–Rbx1 (SCF) ubiquitin ligase complexes. Fbs1, an F‐box protein, binds specifically to proteins modified with high‐mannose oligosaccharides. Fbg3, another F‐box protein, has 51% sequence identity to Fbs1. Although the residues that are necessary for binding to oligosaccharides are conserved between Fbs1 and Fbg3, Fbg3 does not bind glycoproteins. Skp1 and Fbg3 were co‐expressed in Escherichia coli and their complex was purified to homogeneity and crystallized. Microseeding combined with the sandwiched hanging‐drop technique improved the quality of the resulting crystals. The plate‐shaped crystals belonged to space group P212121, with unit‐cell parameters a = 34.1, b = 76.6, c = 193.9 Å and one molecule per asymmetric unit.

Journal

Acta Crystallographica Section FWiley

Published: Jan 1, 2010

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