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Basis for DNA ejection from single phage particles

time (and with a resolution time of 750 milliseconds) the dynamics of DNA ejection from single phages. The ejected DNA was measured at different stages of the ejection process after being stretched by applied hydrodynamic flow. The study demonstrated that DNA release is not an all-or-none process, but rather is unexpectedly complex. DNA release occurred at a very high rate, reaching 75,000 base pairs of DNA/sec, but in a stepwise fashion. Pausing times were observed during ejection, and ejection was transiently arrested at definite positions of the genome in close proximity to genetically defined physical interruptions in the DNA. The authors discuss the relevance of this stepwise ejection to the transfer of phage DNA in vivo.

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Stéphanie Mangenot, Marion Hochrein, Joachim Rädler, and Lucienne Letellier: "Real-Time Imaging of DNA Ejection from Single Phage Particles"

The other members of the research team include Stéphanie Mangenot of the Laboratoire de Physique des Solides, UMR CNRS at Université Paris Sud; Marion Hochrein and Joachim Rädler of Ludwig Maximilian Universität; and Lucienne Letellier of the Institut de Biochimie et Biophysique Moléculaire et Cellulaire, UMR, CNRS at Université Paris Sud. This project was supported in part by the Centre National de la Recherche Scientifique program "Dynamique et Réactivité des Assemblages Biologiques" and by SFB 563 "Bioorganic Functional Systems on Solids."

Publishing in Current Biology, Volume 15, Number 5, March 8, 2005, pages 430-435. http://www.current-biology.com


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Source:Cell Press


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