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Plant and Cell Physiology Advance Access originally published online on July 29, 2007
Plant and Cell Physiology 2007 48(9):1309-1318; doi:10.1093/pcp/pcm098
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

A Cyanobacterial Non-coding RNA, Yfr1, is Required for Growth Under Multiple Stress Conditions

Takahiro Nakamura1, Kumiko Naito, Naoto Yokota, Chieko Sugita and Mamoru Sugita*

Center for Gene Research, Nagoya University, Nagoya, 464-8602 Japan

*Corresponding author: E-mail, sugita{at}gene.nagoya-u.ac.jp; Fax, +81-52-789-3080.


  Abstract

Small, regulatory, non-coding RNA (ncRNA) is involved in various cell functions in both prokaryotes and eukaryotes. However, information on ncRNA in cyanobacteria is still scarce. We studied ncRNA genes by computational screening to compare the intergenic regions of the Synechococcus elongatus PCC 6301 genome with the genomes of three freshwater cyanobacteria. We identified an ncRNA gene in S. elongatus, which has been previously described as yfr1 in marine cyanobacteria. The S. elongatus yfr1 gene is 65 nucleotides long and is positioned between guaB and trxA. We found a high conservation of the yfr1 gene in most cyanobacterial lineages. A yfr1-deficient mutant showed reduced growth under various stress conditions, e.g. oxidative stress and high salt stress conditions, and showed unusual accumulation of sbtA mRNA. A gel shift assay demonstrated interaction of the Yfr1 RNA with sbtA mRNA in vitro. This suggests that the sbtA transcript is a target RNA for the Yfr1 RNA.

Keywords: Cyanobacteria - Functional RNA - Non-coding RNA - Stress response - Synechococcus elongatus

Abbreviations: IGR, intergenic region; ncRNA, non-coding RNA; nt, nucleotide; RACE, rapid amplification of cDNA ends.

1Present address: Department of Research Superstar Program, Organization for the Promotion of Advanced Research, Kyushu University, 6-10-1 Hakozaki, Higashiku, Fukuoka, 812-8581 Japan.

(Received July 12, 2007; Accepted July 24, 2007)
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