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 tRNA Val which has 75.3% homology to T. brucei tRNA Val that exists in a different chromosomal locus. The highest homology of sRNA-76 is to mouse and rat tRNA Asp (69%), to mouse tRNA Gly (68.1%) and to yeast suppressor tRNA Gly (69.5%). However, sRNA-76 is neither a tRNA Asp nor a tRNA Gly, 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.
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