title: The oxalyl-CoA synthetase-regulated oxalate and its distinct effects on resistance to bacterial blight and aluminium toxicity in rice.
abstract: Oxalic acid is widely distributed in biological systems and known to play functional roles in plants. The gene AAE3 was recently identified to encode an oxalyl-CoA synthetase (OCS) in Arabidopsis that catalyses the conversion of oxalate and CoA into oxalyl-CoA. It will be particularly important to characterise the homologous gene in rice since rice is not only a monocotyledonous model plant, but also a staple food crop. Various enzymatic and biological methods have been used to characterise the homologous gene. We first defined that AAE3 in the rice genome (OsAAE3) also encodes an OCS enzyme. Its Kmfor oxalate is 1.73 ± 0.12 mm, and Vmis 6824.9 ± 410.29 U·min-1·mg protein-1. Chemical modification and site-directed mutagenesis analyses identified thiols as the active site residues for rice OCS catalysis, suggesting that the enzyme might be regulated by redox state. Subcellular localisation assay showed that the enzyme is located in the cytosol and predominantly distributed in leaf epidermal cells. As expected, oxalate levels increased when OCS was suppressed in RNAi transgenic plants. More interestingly, OCS-suppressed plants were more susceptible to bacterial blight but more resistant to Al toxicity. The results demonstrate that the OsAAE3-encoded protein also acts as an OCS in rice, and may play different roles in coping with stresses. These molecular, enzymatic and functional data provide first-hand information to further clarify the function and mechanism of OCS in rice plants.
authors.affiliation: State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, China.
authors.forename: C
authors.initials: C
authors.lastname: Peng
authors.affiliation: State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, China.
authors.forename: X
authors.initials: X
authors.lastname: Liang
authors.affiliation: State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, China.
authors.forename: E-E
authors.initials: EE
authors.lastname: Liu
authors.affiliation: State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, China.
authors.forename: J-J
authors.initials: JJ
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, China.
authors.forename: X-X
authors.initials: XX
authors.lastname: Peng
mesh_terms: D000214:Acyl Coenzyme A / Q000378:metabolism; D000535:Aluminum / Q000633:toxicity*; D020134:Catalytic Domain; D003066:Coenzyme A Ligases / Q000235:genetics / Q000378:metabolism*; D060467:Disease Resistance / Q000502:physiology; D015536:Down-Regulation; D004926:Escherichia coli / Q000235:genetics; D018506:Gene Expression Regulation, Plant; D012275:Oryza / Q000187:drug effects / Q000378:metabolism* / Q000382:microbiology; D010070:Oxalates / Q000378:metabolism*; D010935:Plant Diseases / Q000382:microbiology; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D030821:Plants, Genetically Modified; D014974:Xanthomonas / Q000472:pathogenicity
chemical_list: D000214:Acyl Coenzyme A; D010070:Oxalates; D010940:Plant Proteins; C523110:oxalyl-coenzyme A; D000535:Aluminum; D003066:Coenzyme A Ligases
keywords: 
  OsAAE3
  ; 
  oryza sativa
  ; oxalic acid; stress