Tags

Type your tag names separated by a space and hit enter

Characterization of rice anthranilate synthase alpha-subunit genes OASA1 and OASA2. Tryptophan accumulation in transgenic rice expressing a feedback-insensitive mutant of OASA1.
Plant Physiol. 2001 Aug; 126(4):1493-506.PP

Abstract

Anthranilate synthase (AS) is a key enzyme in the synthesis of tryptophan (Trp), indole-3-acetic acid, and indole alkaloids. Two genes, OASA1 and OASA2, encoding AS alpha-subunits were isolated from a monocotyledonous plant, rice (Oryza sativa cv Nipponbare), and were characterized. A phylogenetic tree of AS alpha-subunits from various species revealed a close evolutionary relationship among OASA1 and Arabidopsis ASA2, Ruta graveolens AS alpha 2, and tobacco ASA2, whereas OASA2, Arabidopsis ASA1, and R. graveolens AS alpha 1 were more distantly related. OASA1 is expressed in all tissues tested, but the amount of its mRNA was greater in panicles than in leaves and roots. The abundance of OASA2 transcripts is similar among tissues and greater than that of OASA1 transcripts; furthermore, OASA2 expression was induced by a chitin heptamer, a potent elicitor, suggesting that OASA2 participates in secondary metabolism. Expression of wild-type OASA1 or OASA2 transgenes did not affect the Trp content of rice calli or plants. However, transformed calli and plants expressing a mutated OASA1 gene, OASA1(D323N), that encodes a protein in which aspartate-323 is replaced with asparagine manifested up to 180- and 35-fold increases, respectively, in Trp accumulation. These transgenic calli and plants were resistant to 300 microM 5-methyl-Trp, and AS activity of the calli showed a markedly reduced sensitivity to Trp. These results show that OASA1 is important in the regulation of free Trp concentration, and that mutation of OASA1 to render the encoded protein insensitive to feedback inhibition results in accumulation of Trp at high levels. The OASA1(D323N) transgene may prove useful for the generation of crops with an increased Trp content.

Links

PMC Free PDF
PMC Free Full Text
FREE Publisher Full Text

Authors+Show Affiliations

Tozawa Y
National Agriculture Research Center, 3-1-1 Kannondai, Tsukuba, Ibaraki 305-8666, Japan.
Hasegawa H
No affiliation info available
Terakawa T
No affiliation info available
Wakasa K
No affiliation info available

MeSH

Amino Acid SequenceAnthranilate SynthaseCulture TechniquesDNA, PlantDrug ResistanceGene Expression Regulation, PlantGenes, PlantMolecular Sequence DataMutationOryzaPhylogenyPlant ProteinsPlants, Genetically ModifiedTransformation, GeneticTryptophan

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11500548

Citation

Tozawa, Y, et al. "Characterization of Rice Anthranilate Synthase Alpha-subunit Genes OASA1 and OASA2. Tryptophan Accumulation in Transgenic Rice Expressing a Feedback-insensitive Mutant of OASA1." Plant Physiology, vol. 126, no. 4, 2001, pp. 1493-506.
Tozawa Y, Hasegawa H, Terakawa T, et al. Characterization of rice anthranilate synthase alpha-subunit genes OASA1 and OASA2. Tryptophan accumulation in transgenic rice expressing a feedback-insensitive mutant of OASA1. Plant Physiol. 2001;126(4):1493-506.
Tozawa, Y., Hasegawa, H., Terakawa, T., & Wakasa, K. (2001). Characterization of rice anthranilate synthase alpha-subunit genes OASA1 and OASA2. Tryptophan accumulation in transgenic rice expressing a feedback-insensitive mutant of OASA1. Plant Physiology, 126(4), 1493-506.
Tozawa Y, et al. Characterization of Rice Anthranilate Synthase Alpha-subunit Genes OASA1 and OASA2. Tryptophan Accumulation in Transgenic Rice Expressing a Feedback-insensitive Mutant of OASA1. Plant Physiol. 2001;126(4):1493-506. PubMed PMID: 11500548.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characterization of rice anthranilate synthase alpha-subunit genes OASA1 and OASA2. Tryptophan accumulation in transgenic rice expressing a feedback-insensitive mutant of OASA1. AU - Tozawa,Y, AU - Hasegawa,H, AU - Terakawa,T, AU - Wakasa,K, PY - 2001/8/14/pubmed PY - 2001/10/12/medline PY - 2001/8/14/entrez SP - 1493 EP - 506 JF - Plant physiology JO - Plant Physiol VL - 126 IS - 4 N2 - Anthranilate synthase (AS) is a key enzyme in the synthesis of tryptophan (Trp), indole-3-acetic acid, and indole alkaloids. Two genes, OASA1 and OASA2, encoding AS alpha-subunits were isolated from a monocotyledonous plant, rice (Oryza sativa cv Nipponbare), and were characterized. A phylogenetic tree of AS alpha-subunits from various species revealed a close evolutionary relationship among OASA1 and Arabidopsis ASA2, Ruta graveolens AS alpha 2, and tobacco ASA2, whereas OASA2, Arabidopsis ASA1, and R. graveolens AS alpha 1 were more distantly related. OASA1 is expressed in all tissues tested, but the amount of its mRNA was greater in panicles than in leaves and roots. The abundance of OASA2 transcripts is similar among tissues and greater than that of OASA1 transcripts; furthermore, OASA2 expression was induced by a chitin heptamer, a potent elicitor, suggesting that OASA2 participates in secondary metabolism. Expression of wild-type OASA1 or OASA2 transgenes did not affect the Trp content of rice calli or plants. However, transformed calli and plants expressing a mutated OASA1 gene, OASA1(D323N), that encodes a protein in which aspartate-323 is replaced with asparagine manifested up to 180- and 35-fold increases, respectively, in Trp accumulation. These transgenic calli and plants were resistant to 300 microM 5-methyl-Trp, and AS activity of the calli showed a markedly reduced sensitivity to Trp. These results show that OASA1 is important in the regulation of free Trp concentration, and that mutation of OASA1 to render the encoded protein insensitive to feedback inhibition results in accumulation of Trp at high levels. The OASA1(D323N) transgene may prove useful for the generation of crops with an increased Trp content. SN - 0032-0889 UR - https://www.unboundmedicine.com/medline/citation/11500548/Characterization_of_rice_anthranilate_synthase_alpha_subunit_genes_OASA1_and_OASA2__Tryptophan_accumulation_in_transgenic_rice_expressing_a_feedback_insensitive_mutant_of_OASA1_ L2 - https://academic.oup.com/plphys/article-lookup/doi/10.1104/pp.126.4.1493 DB - PRIME DP - Unbound Medicine ER -