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Journal of Bacteriology, August 2005, p. 5857-5860, Vol. 187, No. 16
0021-9193/05/$08.00+0 doi:10.1128/JB.187.16.5857-5860.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
The Large First Periplasmic Loop of SecD and SecF Plays an Important Role in SecDF Functioning
Nico Nouwen,*
Magdalena Piwowarek,
Greetje Berrelkamp, and
Arnold J. M. Driessen
Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands
Received 4 April 2005/
Accepted 27 May 2005
A remarkable feature of proteins of the SecD and SecF family involved in protein translocation is that they possess a very large first periplasmic domain. Here we report that this large first periplasmic domain is not required for the SecD-SecF interaction but that it is important for catalyzing protein translocation.
* Corresponding author. Mailing address: Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands. Phone: 31-60-3632403. Fax: 31-50-3632154. E-mail:
n.p.nouwen{at}rug.nl.
Journal of Bacteriology, August 2005, p. 5857-5860, Vol. 187, No. 16
0021-9193/05/$08.00+0 doi:10.1128/JB.187.16.5857-5860.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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