title: Escherichia coli tRNA(Arg) acceptor-stem isoacceptors: comparative crystallization and preliminary X-ray diffraction analysis.
abstract: The aminoacylation of tRNA is a crucial step in cellular protein biosynthesis. Recognition of the cognate tRNA by the correct aminoacyl-tRNA synthetase is ensured by tRNA identity elements. In tRNA(Arg), the identity elements consist of the anticodon, parts of the D-loop and the discriminator base. The minor groove of the aminoacyl stem interacts with the arginyl-tRNA synthetase. As a consequence of the redundancy of the genetic code, six tRNA(Arg) isoacceptors exist. In the present work, three different Escherichia coli tRNA(Arg) acceptor-stem helices were crystallized. Two of them, the tRNA(Arg) microhelices RR-1660 and RR-1662, were examined by X-ray diffraction analysis and diffracted to 1.7 and 1.8 A resolution, respectively. The tRNA(Arg) RR-1660 helix crystallized in space group P1, with unit-cell parameters a = 26.28, b = 28.92, c = 29.00 A, alpha = 105.74, beta = 99.01, gamma = 97.44 degrees , whereas the tRNA(Arg) RR-1662 helix crystallized in space group C2, with unit-cell parameters a = 33.18, b = 46.16, c = 26.04 A, beta = 101.50 degrees .
authors.affiliation: Institute of Chemistry and Biochemistry, Free University Berlin, Thielallee 63, 14195 Berlin, Germany.
authors.forename: André
authors.initials: A
authors.lastname: Eichert
authors.forename: Angela
authors.initials: A
authors.lastname: Schreiber
authors.forename: Jens P
authors.initials: JP
authors.lastname: Fürste
authors.forename: Markus
authors.initials: M
authors.lastname: Perbandt
authors.forename: Christian
authors.initials: C
authors.lastname: Betzel
authors.forename: Volker A
authors.initials: VA
authors.lastname: Erdmann
authors.forename: Charlotte
authors.initials: C
authors.lastname: Förster
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D029968:Escherichia coli Proteins / Q000737:chemistry* / Q000235:genetics; D055029:Inverted Repeat Sequences / Q000235:genetics; D017433:Protein Structure, Secondary / Q000235:genetics; D012347:RNA, Transfer, Arg / Q000737:chemistry* / Q000235:genetics; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D029968:Escherichia coli Proteins; D012347:RNA, Transfer, Arg