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Glycine, Serine and Threonine Metabolism in S. meliloti

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One of the most interesting and perhaps best-studied plant bacterial interactions is between rhizobial species and economically important leguminous plants (soybean, alfalfa, beans, peas, etc.). Rhizobia are generally described as root-nodule-forming nitrogen-fixing symbionts belonging to one of five species, Rhizobium, Bradyrhizobium, Sinorhizobium, Azorhizobium, and Mesorhizobium. The S. meliloti (Sinorhizobium meliloti) genome consists of a circular chromosome and two large circular elements (mega plasmids), one of which is essential for growth and Quorum-sensing (Ref.1 & 2). In this Gram-negative bacterium the metabolism of amino acids like Glycine is indispensable for functioning of one-carbon metabolism and for the establishment of a fully effective, nitrogen-fixing root nodule symbiosis. Glycine acts as a source of other vital amino acids like L-Serine and L-Threonine. It [...]


1.The composite genome of the legume symbiont Sinorhizobium meliloti.
Galibert F, Finan TM, Long SR, Puhler A, Abola P, Ampe F, Barloy-Hubler F, Barnett MJ, Becker A, Boistard P, Bothe G, Boutry M, Bowser L, Buhrmester J, Cadieu E, Capela D, Chain P, Cowie A, Davis RW, Dreano S, Federspiel NA, Fisher RF, Gloux S, Godrie T, Goffeau A, Golding B, Gouzy J, Gurjal M, Hernandez-Lucas I, Hong A, Huizar L, Hyman RW, Jones T, Kahn D, Kahn ML, Kalman S, Keating DH, Kiss E, Komp C, Lelaure V, Masuy D, Palm C, Peck MC, Pohl TM, Portetelle D, Purnelle B, Ramsperger U, Surzycki R, Thebault P, Vandenbol M, Vorholter FJ, Weidner S, Wells DH, Wong K, Yeh KC, Batut J.
Science. 2001 Jul 27;293(5530):668-72.
2.Identification of two quorum-sensing systems in Sinorhizobium meliloti.
Marketon MM, Gonzalez JE.
J. Bacteriol. 2002 Jul;184(13):3466-75.
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