L-(+)-lactate dehydrogenase deficiency is lethal in Streptococcus mutans.
AUTOR(ES)
Chen, A
RESUMO
The previously cloned gene for L-(+)-lactate dehydrogenase (LDH) from Streptococcus mutans was mutagenized in vitro. An Escherichia coli transformant which expressed a thermolabile LDH activity was identified. The ldh(Ts) gene was introduced into S. mutans on a suicide vector to create a heterodiploid expressing both wild-type and thermolabile LDH activities. Self-recombinants which had only one ldh gene were isolated. One of these clones expressed only the thermolabile LDH activity. This isolate grew well at 30 degrees C but did not grow at 42 degrees C under a variety of cultivation conditions, thereby proving that LDH deficiency is lethal in S. mutans in the absence of compensatory mutations.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=205228Documentos Relacionados
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