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Plant Cell Reports 2006-Jan

Cloning and characterization of a novel splicing isoform of the iron-superoxide dismutase gene in rice (Oryza sativa L.).

Straipsnius versti gali tik registruoti vartotojai
Prisijungti Registracija
Nuoroda įrašoma į mainų sritį
Wang Feng
Wang Hongbin
Liu Bing
Wang Jinfa

Raktažodžiai

Santrauka

Superoxide dismutases (SODs) are ubiquitous metalloenzymes in aerobic organisms that play a crucial role in protecting organisms against ROS. Here, we report the molecular cloning and functional characterization of a novel alternatively spliced variant of the iron-superoxide dismutase gene, OsFe-SODb, from a rice panicle cDNA library. The alternative splicing event occurred in the fourth exon of the OsFe-SOD gene, and led to the translation of two isoforms of different sizes. The 5' flanking region of the OsFe-SOD was cloned and many cis-acting regulatory elements were found that are involved in light responsiveness, including a G-box and an I-box. RT-PCR analysis showed that the two alternative forms of OsFe-SOD were expressed in both the vegetative and reproductive tissues of Cpslo17. Moreover, accumulation of both isoforms was upregulated by light induction. In addition, the alternative splicing of OsFe-SOD mRNA was sensitive to low temperature. High yield production of the two recombinant OsFe-SOD isoforms was achieved in Escherichia coli. SOD assays showed that C-terminal truncation in OsFe-SODb did not result in a loss of SOD enzyme activity.

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