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Sirotnak, Francis M. (Sloan-Kettering Institute for Cancer Research, New York, N.Y.),Ramona B. Lunt, and Dorris J. Hutchison . Alteration in transformability ofDiplococcus pneumoniae after the acquisition of genetic determinants inducing resistance to erythromycin. J. Bacteriol.86: 735–739. 1963.—The genetic alteration of a highly transformable (competent) recipient strain ofDiplococcus pneumoniae by the transformation of at least two of three identified erythromycin-resistance determinants (Ery a ,Ery b ,Ery c ) results in a marked decrease (Ery a-b recombinant) or complete loss (Ery a-c recombinant) in the ability to be transformed. The occurrence of transformable cells in cultures of the R6Ery a-b recombinant strains, although greatly diminished, still varies during growth in a manner characteristic of the fully competent parent strain. BothEry b andEry c determinants appear to be linked toEry a . In experiments using P32 -labeled deoxyribonucleic acid (DNA), data correlating DNA uptake with transformation show a decrease or loss in uptake capacity of the erythromycin-resistant strains.

ALTERATION IN TRANSFORMABILITY OF DIPLOCOCCUS PNEUMONIAE AFTER THE ACQUISITION OF GENETIC DETERMINANTS INDUCING RESISTANCE TO ERYTHROMYCIN