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Eur J Biochem. 1987 Oct 15;168(2):385-91.

Studies on the sequence and structure of the Escherichia coli K-12 nupG gene, encoding a nucleoside-transport system.

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Institute of Biological Chemistry B, University of Copenhagen, Denmark.


The nupG gene, encoding one of the two active nucleoside-transport systems in Escherichia coli K-12, has been cloned on the multicopy plasmid pBR322 and derivatives thereof. The recombinant plasmids complemented a chromosomal nupG mutation. A genetic map was determined by digestion with restriction endonucleases and the nucleotide sequence of a 3-kb stretch of DNA has been determined on fragments cloned into M13 phages. An open reading frame of 1254 bp, encoding a protein with a calculated molecular mass of 45.333 kDa, was deduced to be the coding region of nupG. Minicell-forming strains carrying plasmids containing this gene were shown to produce a hydrophobic, membrane-bound polypeptide with an apparent molecular mass of approximately 43 kDa.

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