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• W2990478559 abstract "Summary Bundle Sheath Defective 2, BSD2, is a stroma‐targeted protein initially identified as a factor required for the biogenesis of ribulose 1,5‐bisphosphate carboxylase/oxygenase (RuBisCO) in maize. Plants and algae universally have a homologous gene for BSD2 and its deficiency causes a RuBisCO‐less phenotype. As RuBisCO can be the rate‐limiting step in CO 2 assimilation, the overexpression of BSD2 might improve photosynthesis and productivity through the accumulation of RuBisCO. To examine this hypothesis, we produced BSD2 overexpression lines in Arabidopsis. Compared with wild type, the BSD2 overexpression lines BSD2ox‐2 and BSD2ox‐3 expressed 4.8‐fold and 8.8‐fold higher BSD2 mRNA, respectively, whereas the empty‐vector (EV) harbouring plants had a comparable expression level. The overexpression lines showed a significantly higher CO 2 assimilation rate per available CO 2 and productivity than EV plants. The maximum carboxylation rate per total catalytic site was accelerated in the overexpression lines, while the number of total catalytic sites and RuBisCO content were unaffected. We then isolated recombinant BSD2 (rBSD2) from E. coli and found that rBSD2 reduces disulfide bonds using reductants present in vivo , for example glutathione, and that rBSD2 has the ability to reactivate RuBisCO that has been inactivated by oxidants. Furthermore, 15% of RuBisCO freshly isolated from leaves of EV was oxidatively inactivated, as compared with 0% in BSD2 ‐overexpression lines, suggesting that the overexpression of BSD2 maintains RuBisCO to be in the reduced active form in vivo . Our results demonstrated that the overexpression of BSD2 improves photosynthetic efficiency in Arabidopsis and we conclude that it is involved in mediating RuBisCO activation." @default.
• W2990478559 created "2019-12-05" @default.
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• W2990478559 date "2019-12-26" @default.
• W2990478559 modified "2023-10-01" @default.
• W2990478559 title "Overexpression of BUNDLE SHEATH DEFECTIVE 2 improves the efficiency of photosynthesis and growth in <i>Arabidopsis</i>" @default.
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• W2990478559 doi "https://doi.org/10.1111/tpj.14617" @default.
• W2990478559 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7217058" @default.
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