title: Isolation of cDNAs encoding two purine biosynthetic enzymes of soybean and expression of the corresponding transcripts in roots and root nodules.
abstract: Soybean nodule cDNA clones encoding glycinamide ribonucleotide (GAR) synthetase (GMpurD) and GAR transformylase (GMpurN) were isolated by complementation of corresponding Escherichia coli mutants. GAR synthetase and GAR transformylase catalyse the second and the third steps in the de novo purine biosynthesis pathway, respectively. One class of GAR synthetase and three classes of GAR transformylase cDNA clones were identified. Northern blot analysis clearly shows that these purine biosynthetic genes are highly expressed in young and mature nodules but weakly expressed in roots and leaves. Expression levels of GMpurD and GMpurN mRNAs were not enhanced when ammonia was provided to non-nodulated roots.
authors.affiliation: Laboratoire de Biologie Cellulaire, INRA, Centre de Versailles, Versailles, France.
authors.forename: K M
authors.initials: KM
authors.lastname: Schnorr
authors.forename: M
authors.initials: M
authors.lastname: Laloue
authors.forename: B
authors.initials: B
authors.lastname: Hirel
mesh_terms: D000217:Acyltransferases / Q000235:genetics*; D000595:Amino Acid Sequence; D001483:Base Sequence; D019731:Carbon-Nitrogen Ligases; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics*; D018744:DNA, Plant / Q000235:genetics*; D018506:Gene Expression Regulation, Plant / Q000502:physiology*; D005816:Genetic Complementation Test; D019877:Hydroxymethyl and Formyl Transferases; D008025:Ligases / Q000235:genetics*; D008969:Molecular Sequence Data; D051026:Phosphoribosylglycinamide Formyltransferase; D012333:RNA, Messenger / Q000032:analysis; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D013025:Glycine max / Q000201:enzymology / Q000235:genetics*
chemical_list: D018076:DNA, Complementary; D018744:DNA, Plant; D012333:RNA, Messenger; D019877:Hydroxymethyl and Formyl Transferases; D051026:Phosphoribosylglycinamide Formyltransferase; D000217:Acyltransferases; D008025:Ligases; D019731:Carbon-Nitrogen Ligases; C022387:phosphoribosylamine-glycine ligase