Analysis of ssb mutations in vivo implicates SSB protein in two distinct pathways of SOS induction and in recombinational DNA repair.
Mol Microbiol
; 24(1): 129-39, 1997 Apr.
Article
em En
| MEDLINE
| ID: mdl-9140971
ABSTRACT
Site-directed mutations in the Escherichia coli ssb gene were tested for the ability to complement a chromosomal ssb deletion for viability, and only the ssb W54-->G mutation failed to do so at the pSC101 copy level. Non-aromatic amino acid substitutions for SSB Trp-54 (ssb W54-->L and ssb W54-->S) produced the greatest effects on in vivo protein function including altered marker linkage subsequent to generalized transduction, extreme UV sensitivity, and a lack of ability to support SOS induction. Additionally, the ssb-113 (ssb P176-->S) mutation demonstrated the existence of both uvrA-dependent and uvrA-independent components of SOS induction. Although nucleotide excision repair appeared unaffected by alterations in the SSB protein, the mutational analysis suggests a direct role for SSB in recombinational repair.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Resposta SOS em Genética
/
Proteínas de Ligação a DNA
/
Reparo do DNA
Idioma:
En
Revista:
Mol Microbiol
Ano de publicação:
1997
Tipo de documento:
Article