title: Crystallization and preliminary X-ray diffraction of the DEAD-box protein Mss116p complexed with an RNA oligonucleotide and AMP-PNP.
abstract: The Saccharomyces cerevisiae DEAD-box protein Mss116p is a general RNA chaperone which functions in mitochondrial group I and group II intron splicing, translation and RNA-end processing. For crystallization trials, full-length Mss116p and a C-terminally truncated protein (Mss116p/Delta598-664) were overproduced in Escherichia coli and purified to homogeneity. Mss116p exhibited low solubility in standard solutions (< or =1 mg ml(-1)), but its solubility could be increased by adding 50 mM L-arginine plus 50 mM L-glutamate and 50% glycerol to achieve concentrations of approximately 10 mg ml(-1). Initial crystals were obtained by the microbatch method in the presence of a U(10) RNA oligonucleotide and the ATP analog AMP-PNP and were then improved by using seeding and sitting-drop vapor diffusion. A cryocooled crystal of Mss116p/Delta598-664 in complex with AMP-PNP and U(10) belonged to space group P2(1)2(1)2, with unit-cell parameters a = 88.54, b = 126.52, c = 55.52 A, and diffracted X-rays to beyond 1.9 A resolution using synchrotron radiation from sector 21 at the Advanced Photon Source.
authors: Institute for Cellular and Molecular Biology, Department of Chemistry and Biochemistry, and Section of Molecular Genetics and Microbiology, School of Biological Sciences, University of Texas at Austin, Austin, TX 78712, USA.
authors: Mark
authors: M
authors: Del Campo
authors: Alan M
authors: AM
authors: Lambowitz
mesh_terms: D000266:Adenylyl Imidodiphosphate / Q000737:chemistry*; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D053487:DEAD-box RNA Helicases / Q000737:chemistry* / Q000235:genetics; D008968:Molecular Conformation; D012313:RNA / Q000737:chemistry*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000235:genetics
chemical_list: D011994:Recombinant Proteins; D029701:Saccharomyces cerevisiae Proteins; D000266:Adenylyl Imidodiphosphate; D012313:RNA; C058150:MSS116 protein, S cerevisiae; D053487:DEAD-box RNA Helicases