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- W2140363048 abstract "γ-Glutamyl kinase (GK) is the rate-limiting enzyme in proline synthesis in microorganisms. Most microbial GKs contain an N-terminal kinase domain and a C-terminal pseudouridine synthase and archaeosine transglycosylase (PUA) domain. In contrast, higher eukaryotes possess a bifunctional Δ(1)-pyrroline-5-carboxylate synthetase, which consists of a PUA-free GK domain and a γ-glutamyl phosphate reductase (GPR) domain. Here, to examine the role of the C-terminal region, including the PUA domain of Saccharomyces cerevisiae GK, we constructed a variety of truncated yeast GK and GK/GPR fusion proteins from which the C-terminal region was deleted. A complementation test in Escherichia coli and S. cerevisiae and enzymatic analysis of recombinant proteins revealed that a 67-residue linker sequence between a 255-residue kinase domain and a 106-residue PUA domain is essential for GK activity. It also appeared that 67 or more residues of the C-terminal region, not the PUA domain itself, are required for the full display of GK activity. Further, the GK/GPR fusion protein was functional in E. coli, but decreased stability and Mg-binding ability as compared to wild-type GK. These results suggest that the C-terminal region of S. cerevisiae GK is involved in the folding and/or the stability of the kinase domain." @default.
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- W2140363048 date "2012-03-23" @default.
- W2140363048 modified "2023-10-18" @default.
- W2140363048 title "Functional Analysis of the C-Terminal Region of γ-Glutamyl Kinase ofSaccharomyces cerevisiae" @default.
- W2140363048 doi "https://doi.org/10.1271/bbb.110682" @default.
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