Abstract
The Tn3-like transposon Tn4556 (and its derivatives Tn4560 and Tn4563) has been used for insertion mapping of genetic loci cloned on plasmids, but it has been difficult to obtain chromosomal insertions, largely because of the lack of a strong selection against transposon donor molecules. In this communication, we report two efficient selection techniques for transposition and their use in the isolation of chromosomal insertion mutations. A number of independent Streptomyces coelicolor morphological mutants (bld and whi) were obtained. Two of the bld mutations were mapped to locations on the chromosome by SCP1-mediated conjugation; at least one mutation, bld-5m1, appears to define a novel locus involved in control of S. coelicolor morphogenesis and antibiotic production.
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