Journal
JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
Volume 25, Issue 8, Pages 1234-1240Publisher
KOREAN SOC MICROBIOLOGY & BIOTECHNOLOGY
DOI: 10.4014/jmb.1505.05014
Keywords
Heat shock RNA-1; heat shock response; bacterial sequence; Comamonas testosteroni
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Funding
- Chung-Ang University Research Scholarship
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology, Republic of Korea [NRF-2014R1A2A2A09052791]
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Heat shock RNA 1 (HSR1) is described as a eukaryotic heat/sensing noncoding RNA that regulates heat shock response in human and other eukaryotic cells. Highly conserved HSR1 sequences have been identified from humans, hamsters, Drosophila, Caenorhabditis elegans, and Arabidopsis. In a previous study, however, it was suggested that HSR1 had originated from a bacterial genome. HSR1 showed no detectible nucleotide sequence similarity to any eukaryotic sequences but harbored a protein coding region that showed amino-acid sequence similarity to bacterial voltage-gated chloride channel proteins. The bacterial origin of HSR1 was not convincible because the nucleotide sequence similarity was marginal. In this study, we have found that a genomic contig sequence of Comamonas testosteroni strain JL14 contained a sequence virtually identical to that of HSR1, decisively confirming the bacterial origin of HSR1. Thus, HSR1 is an exogenous RNA, which can ectopically trigger heat shock response in eukaryotes. Therefore, it is no longer appropriate to cite HSR1 as a eukaryotic functional noncoding RNA.
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