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J. Bacteriol., 01 1996, 366-371, Vol 178, No. 2
Copyright © 1996, American Society for Microbiology

Bacteriocin small of Rhizobium leguminosarum belongs to the class of N- acyl-L-homoserine lactone molecules, known as autoinducers and as quorum sensing co-transcription factors

J Schripsema, KE de Rudder, TB van Vliet, PP Lankhorst, E de Vroom, JW Kijne and AA van Brussel
Division of Pharmacognosy, Gorlaeus Laboratories, Leiden, and Gist, The Netherlands.

Small bacteriocin was isolated from the culture broth of the gram- negative bacterium Rhizobium leguminosarum, which forms symbiotic nitrogen-fixing root nodules on a number of leguminous plants. The structure of the molecule was elucidated by spectroscopic methods and identified as N-(3R-hydroxy-7-cis-tetradecanoyl)-L-homoserine lactone. The absolute configuration of both asymmetric carbon atoms in the molecule was determined by the use of the chiral solvating agents S-(+)- and R-(-)-2,2,2-trifluoro-1-(9-anthryl)-ethanol. small bacteriocin is structurally related to the quorum sensing co-transcription factors for genes from other bacteria such as Vibrio fischeri, Pseudomonas aeruginosa, Erwinia carotovora, and Agrobacterium tumefaciens which are involved in animal-microbe or plant-microbe interactions. The mechanism of regulation of such interactions by this kind of co-transcription factors is still unknown in R. leguminosarum.


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