Cloning and Characterization of a Pair of Genes That Stimulate the Production and Secretion of Zymomonas mobilis Extracellular Levansucrase and Invertase.

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  • Cloning and Characterization of a Pair of Genes That Stimulate the Production and Secretion of<i>Zymomonas mobilis</i>Extracellular Levansucrase and Invertase
  • Cloning and characterization of a pair of genes that stimulate the production and secretion of extracellular levansucrase and invertase in Zymomonas mobilis

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A 1. 7-kb DNA fragment cloned from Zymomonas mobilis genomic DNA complemented the inability to grow on sucrose of a Suc- mutant of Z. mobilis that was deficient in the production of both extracellular levansucrase and invertase. Analysis of the nucleotide sequence of the fragment found two open reading frames (ORFs), both of which did not correspond to the structural gene for the levansucrase or the invertase. By subcloning each ORF into two different Suc- mutants of Z. mobilis, it has been found that the first ORF (gene zliE) activates the production of the extracellular levansucrase and invertase, and the second ORF (gene zliS) stimulates the secretion of the two enzymes. Gene zliS might contribute to the secretion of proteins having no signal peptide. The expression of zliE and zliS seemed to be under the control of the same promoter.

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