title: Identification of the nature of reading frame transitions observed in prokaryotic genomes.
abstract: Our goal was to identify evolutionary conserved frame transitions in protein coding regions and to uncover an underlying functional role of these structural aberrations. We used the ab initio frameshift prediction program, GeneTack, to detect reading frame transitions in 206 991 genes (fs-genes) from 1106 complete prokaryotic genomes. We grouped 102 731 fs-genes into 19 430 clusters based on sequence similarity between protein products (fs-proteins) as well as conservation of predicted position of the frameshift and its direction. We identified 4010 pseudogene clusters and 146 clusters of fs-genes apparently using recoding (local deviation from using standard genetic code) due to possessing specific sequence motifs near frameshift positions. Particularly interesting was finding of a novel type of organization of the dnaX gene, where recoding is required for synthesis of the longer subunit, τ. We selected 20 clusters of predicted recoding candidates and designed a series of genetic constructs with a reporter gene or affinity tag whose expression would require a frameshift event. Expression of the constructs in Escherichia coli demonstrated enrichment of the set of candidates with sequences that trigger genuine programmed ribosomal frameshifting; we have experimentally confirmed four new families of programmed frameshifts.
authors: School of Computational Science and Engineering at Georgia Tech, Atlanta, GA 30332, USA.
authors: Ivan
authors: I
authors: Antonov
authors: Arthur
authors: A
authors: Coakley
authors: John F
authors: JF
authors: Atkins
authors: Pavel V
authors: PV
authors: Baranov
authors: Mark
authors: M
authors: Borodovsky
mesh_terms: D004258:DNA Polymerase III / Q000235:genetics; D018965:Frameshifting, Ribosomal; D019766:Genes, Archaeal; D005798:Genes, Bacterial; D020745:Genome, Archaeal; D016680:Genome, Bacterial; D011544:Pseudogenes; D016364:Reading Frames; D014158:Transcription, Genetic; D019895:Transposases / Q000235:genetics
chemical_list: D019895:Transposases; D004258:DNA Polymerase III
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