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Applied and Environmental Microbiology, December 1998, p. 4930-4938, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Sinorhizobium fredii and Sinorhizobium meliloti Produce Structurally Conserved Lipopolysaccharides and Strain-Specific K Antigens

Bradley L. Reuhs,1,* Daniel P. Geller,1 John S. Kim,1 Jennifer E. Fox,1 V. S. Kumar Kolli,1 and Steven G. Pueppke2,dagger

Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602-4712,1 and Department of Plant Pathology, University of Missouri, Columbia, Missouri 652112

Received 3 June 1998/Accepted 6 October 1998

Lipopolysaccharides (LPS) and capsular polysaccharides (K antigens) may influence the interaction of rhizobia with their specific hosts; therefore, we conducted a comparative analysis of Sinorhizobium fredii and Sinorhizobium meliloti, which are genetically related, yet symbiotically distinct, nitrogen-fixing microsymbionts of legumes. We found that both species typically produce strain-specific K antigens that consist of 3-deoxy-D-manno-2-octulosonic acid (Kdo), or other 1-carboxy-2-keto-3-deoxy sugars (such as sialic acid), and hexoses. The K antigens of each strain are distinguished by glycosyl composition, anomeric configuration, acetylation, and molecular weight distribution. One consistent difference between the K antigens of S. fredii and those of S. meliloti is the presence of N-acetyl groups in the polysaccharides of the latter. In contrast to the K antigens, the LPS of Sinorhizobium spp. are major common antigens. Rough (R) LPS is the predominant form of LPS produced by cultured cells, and some strains release almost no detectable smooth (S) LPS upon extraction. Sinorhizobium spp. are delineated into two major RLPS core serogroups, which do not correspond to species (i.e., host range). The O antigens of the SLPS, when present, have similar degrees of polymerization and appear to be structurally conserved throughout the genus. Interestingly, one strain was found to be distinct from all others: S. fredii HH303 produces a unique K antigen, which contains galacturonic acid and rhamnose, and the RLPS did not fall into either of the RLPS core serogroups. The results of this study indicate that the conserved S- and RLPS of Sinorhizobium spp. lack the structural information necessary to influence host specificity, whereas the variable K antigens may affect strain-cultivar interactions.

* Corresponding author. Mailing address: Complex Carbohydrate Research Center, University of Georgia, 220 Riverbend Rd., Athens, GA 30602-4712. Phone: (706) 542-1216. Fax: (706) 542-4412. E-mail: breuhs{at}ccrc.uga.edu.

dagger Present address: College of ACES, University of Illinois, Urbana, IL 61801.

Applied and Environmental Microbiology, December 1998, p. 4930-4938, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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