title: Ectopic expression of ubiquitin-conjugating enzyme gene from wild rice, OgUBC1, confers resistance against UV-B radiation and Botrytis infection in Arabidopsis thaliana.
abstract: A previously unidentified gene encoding ubiquitin-conjugating enzyme was isolated from leaves of wild rice plant treated with wounding and microbe-associated molecular patterns. The OgUBC1 gene was composed of 148 amino acids and contained a typical active site and 21 ubiquitin thioester intermediate interaction residues and 4 E3 interaction residues. Both exogenous application of salicylic acid and UV-B irradiation triggered expression of OgUBC1 in leaves of wild rice. Recombinant OgUBC1 proteins bound to ubiquitins in vitro, proposing that the protein might act as E2 enzyme in planta. Heterologous expression of the OgUBC1 in Arabidopsis thaliana protected plants from cellular damage caused by an excess of UV-B radiation. A stable expression of chalcone synthase gene was detected in leaves of OgUBC1-expressing Arabidopsis, resulting in producing higher amounts of anthocyanin than those in wild-type Col-0 plants. Additionally, both pathogenesis-related gene1 and 5 were transcribed in the transgenic Arabidopsis in the absence of pathogen infection. The OgUBC1-expressing plants were resistant to the infection of Botrytis cinerea. Taken together, we suggested that the OgUBC1 is involved in ubiquitination process important for cellular response against biotic and abiotic stresses in plants.
authors.affiliation: Department of Genetic Engineering, Dong-A University, Busan 604-714, Republic of Korea.
authors.forename: En Hee
authors.initials: EH
authors.lastname: Jeon
authors.forename: Jung Hun
authors.initials: JH
authors.lastname: Pak
authors.forename: Mi Jin
authors.initials: MJ
authors.lastname: Kim
authors.forename: Hye Jeong
authors.initials: HJ
authors.lastname: Kim
authors.forename: Sang Hyun
authors.initials: SH
authors.lastname: Shin
authors.forename: Jai Heon
authors.initials: JH
authors.lastname: Lee
authors.forename: Doh Hoon
authors.initials: DH
authors.lastname: Kim
authors.forename: Ju Sung
authors.initials: JS
authors.lastname: Oh
authors.forename: Boung-Jun
authors.initials: BJ
authors.lastname: Oh
authors.forename: Ho Won
authors.initials: HW
authors.lastname: Jung
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Chung
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000382:microbiology* / Q000528:radiation effects*; D020171:Botrytis; D015870:Gene Expression; D012275:Oryza / Q000201:enzymology* / Q000235:genetics; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D011836:Radiation Tolerance / Q000235:genetics*; D044763:Ubiquitin-Conjugating Enzymes / Q000235:genetics*; D014466:Ultraviolet Rays
chemical_list: D044763:Ubiquitin-Conjugating Enzymes