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Widespread cotranslational formation of protein complexes.

PLoS genetics | Dec 6, 2011

Most cellular processes are conducted by multi-protein complexes. However, little is known about how these complexes are assembled. In particular, it is not known if they are formed while one or more members of the complexes are being translated (cotranslational assembly). We took a genomic approach to address this question, by systematically identifying mRNAs associated with specific proteins. In a sample of 31 proteins from Schizosaccharomyces pombe that did not contain RNA-binding domains, we found that ∼38% copurify with mRNAs that encode interacting proteins. For example, the cyclin-dependent kinase Cdc2p associates with the rum1 and cdc18 mRNAs, which encode, respectively, an inhibitor of Cdc2p kinase activity and an essential regulator of DNA replication. Both proteins interact with Cdc2p and are key cell cycle regulators. We obtained analogous results with proteins with different structures and cellular functions (kinesins, protein kinases, transcription factors, proteasome components, etc.). We showed that copurification of a bait protein and of specific mRNAs was dependent on the presence of the proteins encoded by the interacting mRNAs and on polysomal integrity. These results indicate that these observed associations reflect the cotranslational interaction between the bait and the nascent proteins encoded by the interacting mRNAs. Therefore, we show that the cotranslational formation of protein-protein interactions is a widespread phenomenon.

Pubmed ID: 22144913 RIS Download

Mesh terms: Cell Cycle Proteins | Cyclin-Dependent Kinases | DNA Replication | Multiprotein Complexes | Oligonucleotide Array Sequence Analysis | Protein Binding | Protein Biosynthesis | Protein Structure, Tertiary | RNA, Messenger | RNA-Binding Proteins | Schizosaccharomyces | Schizosaccharomyces pombe Proteins

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Associated grants

  • Agency: Biotechnology and Biological Sciences Research Council, Id: BB_BB/G011869/1
  • Agency: Department of Health, Id: BB/G011869/1
  • Agency: Biotechnology and Biological Sciences Research Council, Id:

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Database of functional genomics experiments including gene expression where you can query and download data collected to MIAME and MINSEQE standards. It includes gene expression data from microarray and high throughput sequencing studies. Gene Expression Atlas contains a subset of curated and re-annotated Archive data which can be queried for individual gene expression under different biological conditions across experiments. The ArrayExpress Archive is one of the three international public repositories of functional genomics data supporting publications. It includes data generated by sequencing or array-based technologies. Data are submitted by users and imported directly from the NCBI Gene Expression Omnibus. The ArrayExpress Archive is closely integrated with the Gene Expression Atlas and the sequence databases at the European Bioinformatics Institute. Advanced queries provided via ontology enabled interfaces include queries based on technology and sample attributes such as disease, cell types and anatomy. The Repository contains data from over 47787 experiments comprising approximately 1361377 assays (March 2014). The majority of the data are array based, but other data types are included, including ultra high-throughput sequencing transcriptomics and epigenetic data. All the data and array designs in ArrayExpress are available for direct download in a number of different formats. Submissions are welcome.

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