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The sequence between nucleotides 161 and 512 of cowpea mosaic virus M RNA is able to support internal initiation of translation in vitro

O. Le Gall

Department of Molecular Biology, Agricultural University Wageningen, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands

Cowpea mosaic virus M RNA is translated in vitro as well as in vivo into two C-coterminal polyproteins of M_r 105K and 95K. Initiation of translation of the 95K protein gene occurs at an AUG codon at position 512 of M RNA, 351 nucleotides downstream of the initiation codon of the 105K protein gene at position 161. By employing an in vitro transcription and translation system it was determined that this 351 nucleotide sequence has the capacity to direct ribosomes to initiate translation at a downstream start codon. This effect is independent of the position of this sequence in an mRNA. Furthermore, evidence has been obtained that scanning ribosomes can bypass the AUG at position 161. Thus, both leaky scanning and internal entry are mechanisms for the initiation of translation of the 95K protein gene.

Present address: Station de Pathologie Végétale, INRA, B.P. 81, 33883 Villenave D'Ornon Cédex, France.

Received 22 April 1991; accepted 18 June 1991.

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