Thermococcus Kodakarensis Genetics: TK1827-encoded Beta-glycosidase, New Positive-selection Protocol, and Targeted and Repetitive Deletion Technology

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 2009 Dec 22

PMID 20023088

Citations 53

Authors

Thomas J Santangelo

Lubomira Cubonova

John N Reeve

Affiliations

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Abstract

Inactivation of TK1761, the reporter gene established for Thermococcus kodakarensis, revealed the presence of a second beta-glycosidase that we have identified as the product of TK1827. This enzyme (pTK1827) has been purified and shown to hydrolyze glucopyranoside but not mannopyranoside, have optimal activity at 95 degrees C and from pH 8 to 9.5, and have a functional half-life of approximately 7 min at 100 degrees C. To generate a strain with both TK1761 and TK1827 deleted, a new selection/counterselection protocol has been developed, and the levels of beta-glycosidase activity in T. kodakarensis strains with TK1761 and/or TK1827 deleted and with these genes expressed from heterologous promoters are described. Genetic tools and strains have been developed that extend the use of this selection/counterselection procedure to delete any nonessential gene from the T. kodakarensis chromosome. Using this technology, TK0149 was deleted to obtain an agmatine auxotroph that grows on nutrient-rich medium only when agmatine is added. Transformants can therefore be selected rapidly, and replicating plasmids can be maintained in this strain growing in rich medium by complementation of the TK0149 deletion.

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