STRUCTURES OF NODULATION FACTORS FROM THE NITROGEN-FIXING SOYBEAN SYMBIONT RHIZOBIUM-FREDII USDA257

被引:72
作者
BECFERTE, MP
KRISHNAN, HB
PROME, D
SAVAGNAC, A
PUEPPKE, SG
PROME, JC
机构
[1] UNIV MISSOURI, DEPT PLANT PATHOL, COLUMBIA, MO 65211 USA
[2] CNRS, PHARMACOL & TOXICOL FONDAMENTALES LAB, F-31077 TOULOUSE, FRANCE
关键词
D O I
10.1021/bi00205a014
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We have isolated and characterized the extracellular Nod factors of Rhizobium fredii USDA257, a nitrogen-fixing symbiont of soybean [Glycine max (L.)Merr.] and several other legume species. These signals are produced upon exposure to the isoflavone genistein and consist of a series of substituted, beta 1,4-linked tri-, tetra-, and pentamers of N-acetylglucosamine. N-Vaccenic acid replaces acetate on the nonreducing residue, and the reducing residue contains alpha-linked 2-O-methylfucose on carbon 6. Small amounts of a fucose-containing tetramer also were present. The Nod factors elicit root-hair deformations on soybean and two other plants at concentrations ranging from 10(-6) to 10-(12) M.
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收藏
页码:11782 / 11788
页数:7
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