title: Crystallization and preliminary X-ray analysis of the mRNA-binding domain of elongation factor SelB in complex with RNA.
abstract: In bacteria, the selenocysteine-specific elongation factor SelB is necessary for incorporation of selenocysteine, the 21st amino acid, into proteins by the ribosome. SelB binds to an mRNA hairpin formed by the selenocysteine-insertion sequence (SECIS) and delivers selenocysteyl-tRNA (Sec-tRNASec) at the ribosomal A site. The minimum fragment (residues 512-634) of Moorella thermoacetica SelB (SelB-M) required for mRNA binding has been overexpressed and purified. The complex of SelB-M with 23 nucleotides of the SECIS mRNA hairpin was crystallized at 293 K using the hanging-drop vapour-diffusion or oil-batch methods. The crystals diffract to 2.3 A resolution using SPring-8 BL41XU and belong to the space group P2(1)2(1)2, with unit-cell parameters a = 81.69, b = 169.58, c = 71.69 A.
authors.affiliation: Division of Structural Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Fukuoka, Fukuoka 812-8582, Japan.
authors.forename: Linda
authors.initials: L
authors.lastname: Rasubala
authors.forename: Dominique
authors.initials: D
authors.lastname: Fourmy
authors.forename: Toyoyuki
authors.initials: T
authors.lastname: Ose
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kohda
authors.forename: Katsumi
authors.initials: K
authors.lastname: Maenaka
authors.forename: Satoko
authors.initials: S
authors.lastname: Yoshizawa
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D001665:Binding Sites; D003460:Crystallization; D001411:Geobacillus stearothermophilus / Q000201:enzymology; D010445:Peptide Elongation Factors / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D012329:RNA, Bacterial / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*; D012260:Ribonucleases / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D014961:X-Ray Diffraction
chemical_list: D001426:Bacterial Proteins; D010445:Peptide Elongation Factors; D012329:RNA, Bacterial; D012333:RNA, Messenger; D012260:Ribonucleases; C117079:ribonuclease HIII