Global analysis of Pub1p targets reveals a coordinate control of gene expression through modulation of binding and stability.
Regulation of mRNA turnover is an important cellular strategy for posttranscriptional control of gene expression, mediated by the interplay of cis-acting sequences and associated trans-acting factors. Pub1p, an ELAV-like yeast RNA-binding protein with homology to T-cell internal antigen 1 (TIA-1)/TIA-1-related protein (TIAR), is an important modulator of the decay of two known classes of mRNA. Our goal in this study was to determine the range of mRNAs whose stability is dependent on Pub1p, as well as to identify specific transcripts that directly bind to this protein. We have examined global mRNA turnover in isogenic PUB1 and pub1delta strains through gene expression analysis and demonstrate that 573 genes exhibit a significant reduction in half-life in a pub1delta strain. We also examine the binding specificity of Pub1p using affinity purification followed by microarray analysis to comprehensively distinguish between direct and indirect targets and find that Pub1p significantly binds to 368 cellular transcripts. Among the Pub1p-associated mRNAs, 53 transcripts encoding proteins involved in ribosomal biogenesis and cellular metabolism are selectively destabilized in the pub1delta strain. In contrast, genes involved in transporter activity demonstrate association with Pub1p but display no measurable changes in transcript stability. Characterization of two candidate genes, SEC53 and RPS16B, demonstrate that both Pub1p-dependent regulation of stability and Pub1p binding require 3' untranslated regions, which harbor distinct sequence motifs. These results suggest that Pub1p binds to discrete subsets of cellular transcripts and posttranscriptionally regulates their expression at multiple levels.
Duttagupta
Radharani
R
Department of Molecular Genetics, Microbiology, and Immunology, UMDNJ-Robert Wood Johnson Medical School, 675 Hoes Ln., Piscataway, New Jersey 08854-5627, USA.
Tian
Bin
B
Wilusz
Carol J
CJ
Khounh
Danny T
DT
Soteropoulos
Patricia
P
Ouyang
Ming
M
Dougherty
Joseph P
JP
Peltz
Stuart W
SW
D020413:3' Untranslated Regions; D015966:Gene Expression Regulation, Fungal; D046228:Microarray Analysis; D039102:Poly(A)-Binding Proteins / Q000032:analysis*; D012323:RNA Processing, Post-Transcriptional; D020871:RNA Stability; D012331:RNA, Fungal / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins / Q000032:analysis*; D015534:Trans-Activators; D014158:Transcription, Genetic
D020413:3' Untranslated Regions; C083327:PUB1 protein, S cerevisiae; D039102:Poly(A)-Binding Proteins; D012331:RNA, Fungal; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators