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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Role of guanosine kinase in the utilization of guanosine for nucleotide synthesis in Escherichia coli.

Using purine auxotrophic strains of Escherichia coli with additional genetic lesions in the pathways of interconversion and salvage of purine compounds, we demonstrated the in vivo function of guanosine kinase and inosine kinase. Mutants with increased ability to utilize guanosine were isolated by plating cells on medium with guanosine as the sole purine source. These mutants had altered guanosine kinase activity and the mutations were mapped in the gene encoding guanosine kinase, gsk. Some of the mutants had acquired an additional genetic lesion in the purine de novo biosynthetic pathway, namely a purF, a purL or a purM mutation. A revised map location of the gsk gene is presented and the gene order established as proC-acrA-apt-adk-gsk-purE.[1]

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