Signal Recognition Particle RNA in Dinoflagellates and the Perkinsid Perkinsus marinus

摘要: In dinoflagellates and perkinsids, the molecular structure of protein translocating machinery is unclear. Here, we identified several types full-length signal recognition particle (SRP) RNA genes from Karenia brevis (dinoflagellate) Perkinsus marinus (perkinsid). We also four SRP S-domain proteins, but not two Alu domain P. dinoflagellates. mapped both ends transcripts K. marinus, obtained 3′ end other The lengths are predicted to be ∼260-300 nt in 280-285 marinus. Although these sequences substantially variable, structures similar. genomic organization gene differs among species. brevis, this located downstream spliced leader (SL) RNA, either as SL RNA-SRP RNA-tRNA tandem repeats, or within a RNA-tRNA-U6-5S rRNA cluster. dinoflagellates, does cluster with 5S genes. majority array repeats without above-mentioned small Our results capture snapshot potentially complex evolutionary history alveolates.