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Nucleotide sequence of the pnp gene of Escherichia coli encoding polynucleotide phosphorylase. Homology of the primary structure of the protein with the RNA-binding domain of ribosomal protein S1

Nucleotide sequence of the pnp gene of Escherichia coli encoding polynucleotide phosphorylase. Homology of the primary structure of the protein with the RNA-binding domain of ribosomal protein S1

Journal of Biological Chemistry 262(1): 63-68

ISSN/ISBN: 0021-9258

PMID: 2432069

The pnp gene is located at 69 min on the Escherichia coli chromosome adjacent to the rpsO gene which encodes the ribosomal protein S15. In this paper, we present the sequence of a 3030-nucleotide DNA fragment containing the open reading frames coding for ribosomal protein S15 and polynucleotide phosphorylase. Translation of pnp is initiated by 5'-UUG-3' codon separated by 7 nucleotides from a good ribosome binding site. Codon usage in this gene is typical of highly expressed proteins of E. coli. Some of the transcripts of the pnp gene terminate just after the stem of the terminator t2 visible in the nucleotide sequence. However, a very strong read-through occurs at this site, thus permitting many of the pnp transcripts to extend beyond this transcription terminator. We also describe the primary structure homologies between a 69-amino-acid stretch of polynucleotide phosphorylase and the four homologous stretches of ribosomal protein S1 which form its RNA binding site. The possibility that this 69-amino-acid stretch constitutes the polynucleotide binding domain of polynucleotide phosphorylase is discussed.

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Accession: 040828829

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