Plant Biotechnology
Online ISSN : 1347-6114
Print ISSN : 1342-4580
ISSN-L : 1342-4580
Original Papers
A long 5′ UTR of the rice OsMac1 mRNA enabling the sufficient translation of the downstream ORF
Hiroshi TeramuraYusuke EnomotoHiromi AokiTadamasa SasakiHiroaki Shimada
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2012 Volume 29 Issue 1 Pages 43-49


Untranslated regions (UTRs) of mRNA are involved in many posttranscriptional regulatory pathways. The rice OsMac1 mRNA had a 5′ UTR of more than 500 nucleotides (nt), containing a CU-rich region and three upstream open reading frames (uORFs) preceding the downstream ORF. The expected GFP-fusion protein was detected at the cell membrane, indicating the occurrence of translation of the downstream ORF. The 5′ UTR contained three splicing variants that were generated by alternative splicing. A reporter analysis using β-glucuronidase indicated that only the longest one, UTRc, showed a significant ability for the efficient translation of the downstream ORF, whereas other splicing variants showed low level of translational efficiency of the corresponding ORF. These results suggested that the additional 38-nt sequence unique to UTRc localized between the CU-rich region and the uORFs may be involved in the increased translational efficiency of the downstream ORF located after the long 5′ UTR.

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© 2012 by Japanese Society for Plant Biotechnology
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