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Nucleic Acids Research, 2003, Vol. 31, No. 2 690-699
© 2003 Oxford University Press

Enp1, a yeast protein associated with U3 and U14 snoRNAs, is required for pre-rRNA processing and 40S subunit synthesis

Weidong Chen, Jean Bucaria, David A. Band, Ann Sutton and Rolf Sternglanz*

Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794-5215, USA

*To whom correspondence should be addressed. Tel: +1 631 632 8565; Fax: +1 631 632 8575; Email: rolf{at}life.bio.sunysb.edu

ENP1 is an essential Saccharomyces cerevisiae gene encoding a 483 amino acid polypeptide. Enp1 protein is localized in the nucleus and concentrated in the nucleolus. An enp1-1 temperature-sensitive mutant inhibited 35S pre-rRNA early processing at sites A0, A1 and A2 as shown by northern analysis of steady state levels of rRNA precursors. Pulse-chase analysis further revealed that the enp1-1 strain was defective in the synthesis of 20S pre-rRNA and hence 18S rRNA, which led to reduced formation of 40S ribosomal subunits. Co-precipitation analysis revealed that Enp1 was associated with Nop1 protein, as well as with U3 and U14 RNAs, two snoRNAs implicated in early pre-rRNA processing steps. These results suggest a direct role for Enp1 in the early steps of rRNA processing.


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