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. 1989 Jul;9(7):2989–2999. doi: 10.1128/mcb.9.7.2989

Structural and functional analyses of Saccharomyces cerevisiae wild-type and mutant RNA1 genes.

H M Traglia 1, N S Atkinson 1, A K Hopper 1
PMCID: PMC362767  PMID: 2674676

Abstract

The yeast gene RNA1 has been defined by the thermosensitive rna1-1 lesion. This lesion interferes with the processing and production of all major classes of RNA. Each class of RNA is affected at a distinct and presumably unrelated step. Furthermore, RNA does not appear to exit the nucleus. To investigate how the RNA1 gene product can pleiotropically affect disparate processes, we undertook a structural analysis of wild-type and mutant RNA1 genes. The wild-type gene was found to contain a 407-amino-acid open reading frame that encodes a hydrophilic protein. No clue regarding the function of the RNA1 protein was obtained by searching banks for similarity to other known gene products. Surprisingly, the rna1-1 lesion was found to code for two amino acid differences from wild type. We found that neither single-amino-acid change alone resulted in temperature sensitivity. The carboxy-terminal region of the RNA1 open reading frame contains a highly acidic domain extending from amino acids 334 to 400. We generated genomic deletions that removed C-terminal regions of this protein. Deletion of amino acids 397 to 407 did not appear to affect cell growth. Removal of amino acids 359 to 397, a region containing 24 acidic residues, caused temperature-sensitive growth. This allele, rna1-delta 359-397, defines a second conditional lesion of the RNA1 locus. We found that strains possessing the rna1-delta 359-397 allele did not show thermosensitive defects in pre-rRNA or pre-tRNA processing. Removal of amino acids 330 to 407 resulted in loss of viability.

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