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- W2018355587 abstract "The structure of TPK1Δ, a truncated variant of the cAMP-dependent protein kinase catalytic subunit from Saccharomyces cerevisiae, was determined in an unliganded state at 2.8 Å resolution and refined to a crystallographic R-factor of 19.4%. Comparison of this structure to that of its fully liganded mammalian homolog revealed a highly conserved protein fold comprised of two globular lobes. Within each lobe, root mean square deviations in Cα positions averaged ≈0.9 Å. In addition, a phosphothreonine residue was found in the C-terminal domain of each enzyme. Further comparison of the two structures suggests that a trio of conformational changes accompanies ligand-binding. The first consists of a 14.7° rigid-body rotation of one lobe relative to the other and results in closure of the active site cleft. The second affects only the glycine-rich nucleotide binding loop, which moves ≈3 Å to further close the active site and traps the nucleotide substrate. The third is localized to a C-terminal segment that makes direct contact with ligands and the ligand-binding cleft. In addition to resolving the conformation of unliganded enzyme, the model shows that the salient features of the cAMP-dependent protein kinase are conserved over long evolutionary distances." @default.
- W2018355587 created "2016-06-24" @default.
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- W2018355587 date "2001-03-01" @default.
- W2018355587 modified "2023-10-18" @default.
- W2018355587 title "Structure of the Unliganded cAMP-Dependent Protein Kinase Catalytic Subunit from Saccharomyces cerevisiae" @default.
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- W2018355587 doi "https://doi.org/10.1006/abbi.2000.2241" @default.
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