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Journal of Bacteriology, January 2009, p. 434-438, Vol. 191, No. 1
0021-9193/09/$08.00+0     doi:10.1128/JB.01247-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

The LuxR Family Quorum-Sensing Activator MrtR Requires Its Cognate Autoinducer for Dimerization and Activation but Not for Protein Folding{triangledown} ,§

Menghua Yang,1 Jennifer L. Giel,2 Tao Cai,1 Zengtao Zhong,3 and Jun Zhu1,2,3*

Department of Microbiology, MOA Key Lab of Microbiological Engineering of Agricultural Environment, Nanjing Agricultural University, Nanjing, China,1 Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania,2 The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China3

Received 6 September 2008/ Accepted 21 October 2008

MrtR, a LuxR homolog in Mesorhizobium tianshanense, is important for symbiosis. We found that MrtR requires its cognate N-acylhomoserine lactone for forming dimers, binding to a single DNA site and activating the downstream promoter. However, MrtR is able to fold independently of its ligand.


* Corresponding author. Mailing address: The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China. Phone and fax: 25-843-96645. E-mail: junzhu{at}nju.edu.cn

{triangledown} Published ahead of print on 31 October 2008.

§ Supplemental material for this article may be found at http://jb.asm.org/.


Journal of Bacteriology, January 2009, p. 434-438, Vol. 191, No. 1
0021-9193/09/$08.00+0     doi:10.1128/JB.01247-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.