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. 2001 Mar;157(3):1141–1158. doi: 10.1093/genetics/157.3.1141

Yeast frameshift suppressor mutations in the genes coding for transcription factor Mbf1p and ribosomal protein S3: evidence for autoregulation of S3 synthesis.

J L Hendrick 1, P G Wilson 1, I I Edelman 1, M G Sandbaken 1, D Ursic 1, M R Culbertson 1
PMCID: PMC1461560  PMID: 11238400

Abstract

The SUF13 and SUF14 genes were identified among extragenic suppressors of +1 frameshift mutations. SUF13 is synonymous with MBF1, a single-copy nonessential gene coding for a POLII transcription factor. The suf13-1 mutation is a two-nucleotide deletion in the SUF13/MBF1 coding region. A suf13::TRP1 null mutant suppresses +1 frameshift mutations, indicating that suppression is caused by loss of SUF13 function. The suf13-1 suppressor alters sensitivity to aminoglycoside antibiotics and reduces the accumulation of his4-713 mRNA, suggesting that suppression is mediated at the translational level. The SUF14 gene is synonymous with RPS3, a single-copy essential gene that codes for the ribosomal protein S3. The suf14-1 mutation is a missense substitution in the coding region. Increased expression of S3 limits the accumulation of SUF14 mRNA, suggesting that expression is autoregulated. A frameshift mutation in SUF14 that prevents full-length translation eliminated regulation, indicating that S3 is required for regulation. Using CUP1-SUF14 and SUF14-lacZ fusions, run-on transcription assays, and estimates of mRNA half-life, our results show that transcription plays a minor role if any in regulation and that the 5'-UTR is necessary but not sufficient for regulation. A change in mRNA decay rate may be the primary mechanism for regulation.

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Selected References

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