Transfection of Escherichia coli Spheroplasts III. Facilitation of Transfection and Stabilization of Spheroplasts by Different Basic Polymers
| Autor: | William D. Henner, Rolf Benzinger, Ingrid Kleber |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
Protamine sulfate
Polymers Immunology Spermine Spheroplasts Biology medicine.disease_cause Coliphages Microbiology Histones chemistry.chemical_compound Virology Escherichia coli Methods Polyamines medicine Protamines fungi Natural competence Dextrans Transfection Spheroplast Molecular biology Protamine Molecular Weight Biochemistry chemistry Insect Science DNA Viral Bacterial Viruses biology.protein Peptides DNA medicine.drug |
| Zdroj: | Journal of Virology. 12:741-747 |
| ISSN: | 1098-5514 0022-538X |
| DOI: | 10.1128/jvi.12.4.741-747.1973 |
| Popis: | The only compound which fully replaced protamine sulfate in facilitating transfection of Escherichia coli spheroplasts by phage DNAs was spermine; poly- l -lysine, poly- l -arginine, DEAE-dextran, histones, and many other polyamines were only slightly effective. Higher-molecular-weight compounds were effective at lower concentrations, and each compound had a sharp concentration optimum. The specificity of the facilitation of transfection is discussed in light of Leonard and Cole's (1972) isolation of a polyamine- or protamine-like, natural competence factor from Streptococci . By standardizing growth conditions for spheroplast cultures, storing spheroplasts in minimal medium, and adding both protamine sulfate and polyamines to spheroplasts, reproducible competence levels were obtained. Thus, 95% of all spheroplast preparations gave efficiencies of transfection between 10 −3 and 3 × 10 −4 for lambda DNA; between 10 −6 and 3 × 10 −8 for T7 DNA; and between 3 × 10 −6 and 10 −7 for T5 phage DNA. The stability of the spheroplasts was extended from 10 h to between 2 and 5 days, depending on the DNA used for transfection. |
| Databáze: | OpenAIRE |
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