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Mol. Cell. Biol., Dec 1997, 7283-7294, Vol 17, No. 12
Copyright © 1997, American Society for Microbiology

Fal1p is an essential DEAD-box protein involved in 40S-ribosomal- subunit biogenesis in Saccharomyces cerevisiae

D Kressler, J de la Cruz, M Rojo and P Linder
Departement de Biochimie Medicale, Centre Medical Universitaire, Universite de Geneve, Switzerland.

A previously uncharacterized Saccharomyces cerevisiae gene, FAL1, was found by sequence comparison as a homolog of the eukaryotic translation initiation factor 4A (eIF4A). Fal1p has 55% identity and 73% similarity on the amino acid level to yeast eIF4A, the prototype of ATP-dependent RNA helicases of the DEAD-box protein family. Although clearly grouped in the eIF4A subfamily, the essential Fal1p displays a different subcellular function and localization. An HA epitope-tagged Fal1p is localized predominantly in the nucleolus. Polysome analyses in a temperature-sensitive fal1-1 mutant and a Fal1p-depleted strain reveal a decrease in the number of 40S ribosomal subunits. Furthermore, these strains are hypersensitive to the aminoglycoside antibiotics paromomycin and neomycin. Pulse-chase labeling of pre-rRNA and steady- state-level analysis of pre-rRNAs and mature rRNAs by Northern hybridization and primer extension in the Fal1p-depleted strain show that Fal1p is required for pre-rRNA processing at sites A0, A1, and A2. Consequently, depletion of Fal1p leads to decreased 18S rRNA levels and to an overall deficit in 40S ribosomal subunits. Together, these results implicate Fal1p in the 18S rRNA maturation pathway rather than in translation initiation.


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