Amplification of bacterial plasmids without blocking protein biosynthesis.
Plasmid
; 22(2): 160-2, 1989 Sep.
Article
em En
| MEDLINE
| ID: mdl-2695952
ABSTRACT
The effect of amino acids (presence or absence from the growth media) and metal ions on the replication of Escherichia coli plasmids in rel A+ strains was studied. It was found that (i) The absence of one amino acid from the growth media had no effect on the plasmid copy number in prototrophic E. coli strains (ii) The presence of only one amino acid in artificial media free of amino acids had a negligible effect on the plasmid copy number for the amino acids Ala, Arg, Glu, His, Leu, Phe, Thr, Trp, and Tyr (iii) The combination of Met and Thr caused a rise in pBR322 plasmid copy number up to 90-100 plasmid copies per cell (iv) The Fe3+ concentration had an amplification effect on E. coli plasmids. The pBR322 plasmid copy number for media free of amino acids and supplemented with 0.2-0.4 mM FeCl3 was 60-80 plasmid copies per cell (v) The combination of Fe3+ with certain amino acids (Ala, Arg, Glu, Leu, Thr, and Trp) leads to a dramatic increase in the plasmid copy number reaching 180-270 plasmid copies per cell for the plasmid pBR322 and 20-24 for the plasmid pR100.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Plasmídeos
/
Biossíntese de Proteínas
/
Amplificação de Genes
Idioma:
En
Revista:
Plasmid
Ano de publicação:
1989
Tipo de documento:
Article