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Journal of Bacteriology, March 2004, p. 1714-1719, Vol. 186, No. 6
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.6.1714-1719.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

A -1 Ribosomal Frameshift in the Transcript That Encodes the Major Head Protein of Bacteriophage A2 Mediates Biosynthesis of a Second Essential Component of the Capsid

Pilar García, Isabel Rodríguez, and Juan E. Suárez*

Area de Microbiología, Facultad de Medicina, Universidad de Oviedo, Julián Clavería s.n., 33006 Oviedo, and Instituto de Productos Lácteos de Asturias (CSIC), Villaviciosa, Spain

Received 21 October 2003/ Accepted 3 December 2003

The two major capsid proteins of Lactobacillus bacteriophage A2 share their amino termini. The smaller of these (gp5A) results from translation of orf5 and proteolytic processing after residue 123. The larger form (gp5B) originates through a -1 ribosomal frameshift at the penultimate codon of orf5 mRNA, resulting in a product that is 85 amino acids longer than gp5A. Frameshifting needs two cis-acting elements: a slippery region with the sequence C CCA AAA (0 frame), and a stem-loop that begins 9 nucleotides after the end of the slippery sequence. Mutations introduced in the slippery sequence suppress the frameshift. Similarly, deletion of the second half of the stem-loop results in drastic reduction of frameshifting. Both gp5A and gp5B appear to be essential for phage viability, since lysogens harboring prophages that produce only one or the other protein become lysed upon induction with mitomycin C, though no viable phage progeny are observed.

* Corresponding author, Mailing address: Area de Microbiología, Facultad de Medicina, Universidad de Oviedo, Julián Clavería s.n., 33006 Oviedo, Spain. Phone: 34 985103559. Fax: 34 985103148. E-mail: evaristo{at}correo.uniovi.es.

Journal of Bacteriology, March 2004, p. 1714-1719, Vol. 186, No. 6
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.6.1714-1719.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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  • Rodriguez, I., Garcia, P., Suarez, J. E. (2005). A Second Case of -1 Ribosomal Frameshifting Affecting a Major Virion Protein of the Lactobacillus Bacteriophage A2. J. Bacteriol. 187: 8201-8204 [Abstract] [Full Text]  


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