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• W2912752457 abstract "ABSTRACT The divergence of duplicate genes links to organismic adaptation. In Arabidopsis thaliana two nuclear genes encode mitochondrial GrpEs, MGE1 and MGE2, the nucleotide exchange factors of DnaK/HSP70 chaperone. MGE1 and MGE2 are duplicate genes originated from a whole genome duplication event. They respond differentially to high temperature; MGE2 is heat-inducible and is required for Arabidopsis seedlings to tolerate prolonged heat stress, while MGE1 is constitutively expressed. Heterologous expression of MGE2 but not MGE1 restored the growth of E. coli grpE mutant cells at elevated temperatures, suggesting that MGE2 is more thermostable than MGE1. In this study, we directly compared the thermostability of the purified recombinant MGE1 and MGE2 by circular dichroism spectroscopy. The temperature midpoints of the unfolding transition (T m ) of MGE1 and MGE2 were about 38 and 46 °C, respectively, indicating that MGE2 is remarkably more stable than MGE1 at higher temperature. Domain swapping between the two homologous proteins showed that the N-terminal region, including an unstructured sequence and a long α-helix domain, is the major determinant of the thermostability. Although MGE2 contains a conserved sequence derived from an exonized intron within the N-terminus unstructured region, deletion of this sequence did not substantially affect protein thermostability in vitro and complementation of E. coli and Arabidopsis heat sensitive mutants. Taken together, our results suggest that Arabidopsis MGE1 and MGE2 had diverged not only in transcriptional response but also in the thermostability of the encoded proteins, which may contribute to adaptation of plants to higher temperatures." @default.
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• W2912752457 date "2019-02-18" @default.
• W2912752457 modified "2023-10-17" @default.
• W2912752457 title "Divergence in Thermostability of Arabidopsis Mitochondrial Nucleotide Exchange Factors Encoded by Duplicate Genes, MGE1 and MGE2" @default.
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• W2912752457 doi "https://doi.org/10.1101/553503" @default.
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