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Chem Biol October 1, 2002; 9 (10): 1095-107.

Exclusive interaction of the 15.5 kD protein with the terminal box C/D motif of a methylation guide snoRNP.

Szewczak LB , DeGregorio SJ , Strobel SA , Steitz JA .

Box C/D small nucleolar RNAs (snoRNAs) direct site-specific methylation of ribose 2''-hydroxyls in ribosomal and spliceosomal RNAs. To identify snoRNA functional groups contributing to assembly of an active box C/D snoRNP in Xenopus oocytes, we developed an in vivo nucleotide analog interference mapping procedure. Deleterious substitutions consistent with requirements for binding the 15.5 kD protein clustered within the terminal box C/D motif only. In vitro analyses confirmed a single interaction site for recombinant 15.5 kD protein and identified the exocyclic amine of A89 in box D as essential for binding. Our results argue that the 15.5 kD protein interacts asymmetrically with the two sets of conserved box C/D elements and that its binding is primarily responsible for the stability of box C/D snoRNAs in vivo.

PubMed ID: 12401494
Article link: Chem Biol
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