We developed a counterselectable deletion system for Thermus thermophilus HB27 based on cytosine deaminase (encoded by codA) from Thermaerobacter marianensis DSM 12885 and the sensitivity of T. thermophilus HB27 to the antimetabolite 5-fluorocytosine (5-FC). The deletion vector comprises the pUC18 origin of replication, a thermostable kanamycin resistance marker functional in T. thermophilus HB27, and codA under the control of a constitutive putative trehalose promoter from T. thermophilus HB27. The functionality of the system was demonstrated by deletion of the bglT gene, encoding a β-glycosidase, and three carotenoid biosynthesis genes, CYP175A1, crtY, and crtI, from the genome of T. thermophilus HB27.
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| http://dx.doi.org/10.1128/AEM.03524-15 | DOI Listing |
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