Identification of a tRNA-like molecule that copurifies with the 7SL RNA of Trypanosoma brucei

Oded Béjà, Elisabetta Ullu, Shulamit Michaeli

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30 Scopus citations

Abstract

During the purification of Trypanosoma brucei 7SL RNA, we detected a small RNA, 76 nucleotide-long (sRNA-76), that copurified with the 7SL RNP through several different separation steps. In this study, a partial RNA sequence of sRNA-76 was obtained and a complementary oligonucleotide to the RNA sequence was used to clone the corresponding gene. sRNA-76 is very similar to a tRNA molecule and is encoded by a single copy gene. The gene is located next to a tRNAVal which has 75.3% homology to T. brucei tRNAVal that exists in a different chromosomal locus. The highest homology of sRNA-76 is to mouse and rat tRNAAsp (69%), to mouse tRNAGly (68.1%) and to yeast suppressor tRNAGly (69.5%). However, sRNA-76 is neither a tRNAAsp nor a tRNAGly, since it has a Leu anticodon. In addition, sRNA-76 deviates from the canonical tRNA structure in 3 positions. A potential for base pairing between sRNA-76 and 7SL RNA was found in the 100 nt region of 7SL RNA, which is a highly conserved region in all 7SL RNAs.

Original languageEnglish
Pages (from-to)223-229
Number of pages7
JournalMolecular and Biochemical Parasitology
Volume57
Issue number2
DOIs
StatePublished - Feb 1993
Externally publishedYes

Keywords

  • 7SL RNA
  • Signal recognition particle
  • Trypanosoma
  • sRNA-76
  • tRNA

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