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Example sentences for: xyle

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1) A promoterless TN5 aph gene was PCR amplified from pUC4-KIXX as an 850-bp fragment using primers 1915 and 1916, and a promoterless xylE gene was PCR amplified from pTKMX97 as a 935-bp fragment using primers 1917 and 1918.
This amplicon was Not I-digested and cloned into the Not I site of the pHIP1 plasmid containing the xylE gene to generate pHIP4.
To compare directly the relative ability of the sur2 and wild-type bacteria to survive in macrophages, THP-1 macrophages were infected with a mixture of a genetically marked control strain and the sur2 strain and the survival of each strain was followed independently as previously described [ 22 ] . The wild-type strain expresses the xylE gene product, catechol 2,3-dioxygenase, such that when its colonies are sprayed with catechol, they turn bright yellow, while wild-type colonies remain white.
For the screening step, we used the xylE gene because catechol 2,3 dioxygenase activity is easily measured by spraying colonies with catechol and the amount of color produced is a rough measure of promoter activity [ 10 ] . In our screen, white, pale yellow, and bright yellow colonies were observed, indicating a wide range of promoter activity.
Replating of the yellow colonies produced a mixture of white and yellow colonies, suggesting that the expression of the xylE or aph gene in the SigE-expressing strain may be detrimental to the cell and may lead to plasmid instability.