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Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 Sep 1;65(Pt 9):930-2. doi: 10.1107/S1744309109031376. Epub 2009 Aug 26.

Crystallization and preliminary X-ray diffraction studies of the ubiquitin-like (UbL) domain of the human homologue A of Rad23 (hHR23A) protein.

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Randall Division of Cell and Molecular Biophysics, King's College London, London, England.


Human homologue A of Rad23 (hHR23A) plays dual roles in DNA repair as well as serving as a shuttle vehicle targeting polyubiquitinated proteins for degradation. Its N-terminal ubiquitin-like (UbL) domain interacts with the 19S proteasomal cap and provides the docking mechanism for protein delivery. Pyramidal crystals of the UbL domain of hHR23A were obtained by the hanging-drop vapour-diffusion method with ammonium sulfate as the crystallizing agent. The crystals diffracted to beyond 2 A resolution and belonged to the hexagonal space group P6(5)22, with unit-cell parameters a = b = 78.48, c = 63.57 A. The structure was solved by molecular replacement using the UbL domain of yeast Dsk2 as the search model.

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