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  • Title: Escherichia coli females defective in conjugation and in adsorption of a single-stranded deoxyribonucleic acid phage.
    Author: Reiner AM.
    Journal: J Bacteriol; 1974 Jul; 119(1):183-91. PubMed ID: 4600698.
    Abstract:
    We predicted that, among mutants resistant to infection by single-stranded deoxyribonucleic acid viruses, there would be some also resistant to "infection" by single-stranded conjugal deoxyribonucleic acid. Approximately 5% of the Escherichia coli K-12 females selected for resistance to phage ST-1 were defective as recipients in conjugation. These spontaneous mutants fell into two classes. Type A accepted both plasmid and chromosomal markers at greatly reduced frequencies (<10(-6) of normal for at least one strain), formed "rough" colonies, and (unlike their parent) were nonflagellated. Type B strains accepted both chromosomal and plasmid markers at reduced frequencies (10(-2) to 10(-1) of normal), were temperature sensitive for growth, and showed increased susceptibility towards antibiotics and deoxycholate. Both classes of mutants also were resistant to certain female-specific viruses.
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