title: Indole-3-acetic acid biosynthetic pathway and aromatic amino acid aminotransferase activities in Pantoea dispersa strain GPK.
abstract: This investigation deals with the production of IAA by a bacterial isolate Pantoea dispersa strain GPK (PDG) identified by 16S rRNA gene sequence analysis. HPLC and Mass spectral analysis of metabolites from bacterial spent medium revealed that, IAA production by PDG is Trp-dependent and follows indole-3-pyruvic acid (IPyA) pathway. Substrate specificity study of aromatic amino acid aminotransferase (AAT) showed high activities, only when tryptophan (Trp) and α-ketoglutarate (α-kg) were used as substrates. AAT is highly specific for Trp and α-kg as amino group donor and acceptor, respectively. The effect of exogenous IAA on bacterial growth was established. Low concentration of exogenous IAA induced the growth, whereas high concentration decreased the growth of bacterium. PDG treatment significantly increased the root length, shoot length and dry mass of the chickpea and pigeon pea plants.
authors: Department of Biochemistry, Gulbarga University, Gulbarga, Karnataka, India.
authors: G B
authors: GB
authors: Kulkarni
authors: A S
authors: AS
authors: Nayak
authors: S S
authors: SS
authors: Sajjan
authors: A
authors: A
authors: Oblesha
authors: T B
authors: TB
authors: Karegoudar
mesh_terms: D053898:Biosynthetic Pathways; D036561:Cajanus / Q000254:growth & development; D029863:Cicer / Q000254:growth & development; D007210:Indoleacetic Acids / Q000378:metabolism* / Q000494:pharmacology; D007211:Indoles / Q000378:metabolism; D007656:Ketoglutaric Acids / Q000378:metabolism; D020636:Pantoea / Q000254:growth & development / Q000378:metabolism*; D013379:Substrate Specificity; D000637:Transaminases / Q000378:metabolism*; D014364:Tryptophan / Q000378:metabolism
chemical_list: D007210:Indoleacetic Acids; D007211:Indoles; D007656:Ketoglutaric Acids; C008122:indol-3-yl pyruvic acid; C030737:indoleacetic acid; D014364:Tryptophan; D000637:Transaminases; C019729:aromatic amino acid aminotransferase