Molecular and General Genetics MGG

, Volume 213, Issue 2–3, pp 444–448 | Cite as

Polarity of DNA entry in transformation of Streptococcus pneumoniae

  • Vincent Méjean
  • Jean-Pierre Claverys


DNA transport in Streptococcus pneumoniae was studied using donor molecules labelled either at the 3′ or at the 5′ end, on one strand only. In contrast to 5′ end label, 3′ end label was not taken up by the cells indicating that entry is a polarized process. Our results together with those of previous studies are consistent with a model for entry in which double-stranded donor DNA is nicked on binding at the cell surface. Entry of a single strand then proceeds linearly from a newly formed 3′ end to the extremity of the donor fragment.

Key words

Bacterial transformation DNA uptake Polarity 


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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Vincent Méjean
    • 1
  • Jean-Pierre Claverys
    • 1
  1. 1.Centre de Recherche de Biochimie et de Génétique Cellulaires du C.N.R.S.Université Paul SabatierToulouse CedexFrance

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