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Updated: Jul 15, 2026

Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
Published on: July 27, 2021
The leader sequence of tobacco mosaic virus RNA devoid of Watson-Crick secondary structure possesses a cooperatively
Alexey A Kovtun1, Nikolay E Shirokikh, Anatoly T Gudkov
1Institute of Protein Research, Russian Academy of Sciences, Moscow Region, Pushchino 142290, Russia.
Abstract:
The 5'-untranslated region (5'-UTR) of RNA of tobacco mosaic virus (TMV), called omega sequence, is known as an mRNA leader promoting efficient initiation of translation. The central part of the sequence consists of many CAA repeats, which were reported to be mainly responsible for the enhancing activity of the omega leader. In this work we synthesized the polyribonucleotides containing either the natural omega sequence or the regular (CAA)(n) sequence, and studied them using UV spectrophotometry and analytical ultracentrifugation methods. It was demonstrated that the polyribonucleotides manifest significant hypochromicity, cooperative melting of their structures upon heating, high melting temperature, and the sedimentation coefficients typical of compactly folded RNAs of this size. Thus, the omega leader and its core (CAA)(n) repeat sequence devoid of secondary structure of the Watson-Crick type seem to be well structured elements of mRNA.
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