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An apigenin-induced decrease in K-antigen production by Sinorhizobium sp. NGR234 is y4gM- and nodD1-dependent |
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| Authors: | Senay Simsek Tuula Ojanen-Reuhs Bradley L Reuhs |
| Institution: | a North Dakota State University, Department of Plant Sciences, 1250 Bolley Dr, PO Box 6050, Dept#7670, Fargo, ND 58108-6050, USA b Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, West Lafayette, IN 47907, USA c LBMPS Université de Genéve, 30 quai Ernest-Ansermet, 1211 Genéve 4, Switzerland |
| Abstract: | Cultured cells of Sinorhizobium sp. NGR234 produce an abundance of capsular polysaccharides, or K antigens; however, cells that are cultured in the presence of apigenin, a nod gene inducer, exhibited a significant reduction in K-antigen production. The flavonoid-induced modulation in capsule production appeared to be related to the phase-shift changes associated with bacteroid differentiation. Therefore, the polysaccharides were extracted from Sinorhizobium sp. NGR234 bacteroids recovered from Vigna unguiculata cv Red Caloona root nodules, and subsequent analyses showed that the bacteroid extracts were virtually devoid of K-antigen. Polysaccharide extracts from two nodulation mutants cultured in the presence of apigenin were then analyzed, and the results showed that the flavonoid-inducible decrease in K-antigen production is y4gM- and nodD1-dependent. |
| Keywords: | Capsular polysaccharides K-antigen Sinorhizobium sp NGR234 Phase-shift nodD: y4gM |
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