DNA Sequences Required to Induce Localized Conversion in Streptococcus Pneumoniae Transformation

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1988 Nov 1

PMID 3216856

Citations 3

Authors

P Garcia

A M Gasc

X Kyriakidis

D Baty

M Sicard

Affiliations

Soon will be listed here.

Abstract

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.

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