title: Molecular basis of box C/D RNA-protein interactions; cocrystal structure of archaeal L7Ae and a box C/D RNA.
abstract: We have determined and refined a crystal structure of the initial assembly complex of archaeal box C/D sRNPs comprising the Archaeoglobus fulgidus (AF) L7Ae protein and a box C/D RNA. The box C/D RNA forms a classical kink-turn (K-turn) structure and the resulting protein-RNA complex serves as a distinct platform for recruitment of the fibrillarin-Nop5p complex. The cocrystal structure confirms previously proposed secondary structure of the box C/D RNA that includes a protruded U, a UU mismatch, and two sheared tandem GA base pairs. Detailed structural comparisons of the AF L7Ae-box C/D RNA complex with previously determined crystal structures of L7Ae homologs in complex with functionally distinct K-turn RNAs revealed a set of remarkably conserved principles in protein-RNA interactions. These analyses provide a structural basis for interpreting the functional roles of the box C/D sequences in directing specific assembly of box C/D sRNPs.
authors.affiliation: Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
authors.forename: Terrie
authors.initials: T
authors.lastname: Moore
authors.forename: Yanming
authors.initials: Y
authors.lastname: Zhang
authors.forename: Marcia O
authors.initials: MO
authors.lastname: Fenley
authors.forename: Hong
authors.initials: H
authors.lastname: Li
mesh_terms: D000595:Amino Acid Sequence; D019611:Archaeoglobus fulgidus / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D018360:Crystallography, X-Ray; D008969:Molecular Sequence Data; D017434:Protein Structure, Tertiary; D012313:RNA / Q000737:chemistry* / Q000378:metabolism; D012261:Ribonucleoproteins / Q000737:chemistry; D012269:Ribosomal Proteins / Q000737:chemistry* / Q000378:metabolism; D055672:Static Electricity
chemical_list: D012261:Ribonucleoproteins; D012269:Ribosomal Proteins; D012313:RNA