ISSN:
1617-4623
Keywords:
Oligomer mutagenesis
;
Mismatch repair
;
Pneumococcus
;
Recombination
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary In pneumococcal transformation a particular point mutation belonging to the amiA locus is able markedly to enhance recombination frequency when crossed with any other markers of this gene. This results from a polarized conversion of the mutation towards the wild-type sequence. In this report, by site-directed oligonucleotide mutagenesis, we have generated a series of mutants showing various degrees of conversion. We have found that the substitution 5′-ATTCAT→5′-ATTAAT is a sufficient signal for localized conversion. Changing individual bases within this sequence results in decreased conversion frequencies to levels that depend on the mutation, suggesting that there is a family to related sequences which may act as a substrate for a conversion system. Moreover, the length over which this conversion occurs has been estimated to be 12 base pairs on the average.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00330488
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