title: Enzymatic radiolabelling to a high specific activity of legume lipo-oligosaccharidic nodulation factors from Rhizobium meliloti.
abstract: In this paper we describe the two-step coupled 35S-radiolabelling of the lipo-oligosaccharidic nodulation (Nod) factors of the bacterium Rhizobium meliloti to a specific radioactivity of 800 Ci/mmol. These radiolabelled Nod factors bind to a particulate fraction from roots of the bacterium's symbiotic host, Medicago truncatula, with an equilibrium dissociation constant (KD) of 117 nM, similar to that observed with a synthetic tritiated ligand. The first step of the 35S-labelling involves the synthesis of 3'-phosphoadenosine 5'-phospho[35S]sulphate ([35S]PAPS) from ATP and [35S]sulphate using yeast enzymes. The second step exploits the sulphotransferase activity of the R. meliloti NodH protein, which has been expressed in Escherichia coli, to transfer the labelled sulphate group from PAPS to non-sulphated Nod factors. This enzyme was found to be active in E. coli cultured at 18 degrees C but not 37 degrees C. NodH could also transfer the sulphate group from PAPS to a model substrate, tetra-N-acetyl chitotetraose, with apparent Km values of 56 and 70 microM respectively, and exhibited an apparent Km value for non-sulphated Nod factors of 28 microM. Coupling the two steps of the radiolabelling resulted in an efficiency of 35S incorporation from inorganic sulphate to the Nod factors of approximately 10%. These labelled factors will be a valuable tool in the search for high-affinity receptors for the lipo-oligosaccharidic nodulation factors.
authors.affiliation: Laboratoire de Biologie Moléculaire des Relations Plantes-Microorganismes, INRA-CNRS, Castanet-Tolosan, France.
authors.forename: J P
authors.initials: JP
authors.lastname: Bourdineaud
authors.forename: J J
authors.initials: JJ
authors.lastname: Bono
authors.forename: R
authors.initials: R
authors.lastname: Ranjeva
authors.forename: J V
authors.initials: JV
authors.lastname: Cullimore
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D001665:Binding Sites; D001667:Binding, Competitive; D004926:Escherichia coli; D007887:Fabaceae / Q000378:metabolism; D007553:Isotope Labeling; D008070:Lipopolysaccharides / Q000378:metabolism*; D010724:Phosphoadenosine Phosphosulfate / Q000138:chemical synthesis / Q000378:metabolism; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D010946:Plants, Medicinal; D011994:Recombinant Proteins / Q000378:metabolism; D016962:Sinorhizobium meliloti / Q000737:chemistry*; D013430:Sulfate Adenylyltransferase / Q000378:metabolism; D013431:Sulfates / Q000378:metabolism; D015238:Sulfotransferases / Q000378:metabolism; D013462:Sulfur Radioisotopes
chemical_list: D008070:Lipopolysaccharides; C092082:Nod factor IV, Rhizobium meliloti; D011994:Recombinant Proteins; D013431:Sulfates; D013462:Sulfur Radioisotopes; D010724:Phosphoadenosine Phosphosulfate; D000255:Adenosine Triphosphate; D017853:Phosphotransferases (Alcohol Group Acceptor); C019617:adenylylsulfate kinase; D013430:Sulfate Adenylyltransferase; D015238:Sulfotransferases