An atomic model for protein-protein phosphoryl group transfer.
نویسندگان
چکیده
منابع مشابه
An atomic model for protein-protein phosphoryl group transfer.
The high resolution crystal structures of two interacting proteins from the phosphoenolpyruvate:sugar phosphotransferase system, the histidine-containing phosphocarrier protein (HPr) and the IIA domain of glucose permease (IIA(Glc)) from Bacillus subtilis, provide the basis for modeling the transient binary complex formed during the phosphoryl group transfer. The complementarity of the interact...
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X-ray structures of several ternary product complexes of the catalytic subunit of cAMP-dependent protein kinase (PKAc) have been determined with no bound metal ions and with Na(+) or K(+) coordinated at two metal-binding sites. The metal-free PKAc and the enzyme with alkali metals were able to facilitate the phosphoryl transfer reaction. In all studied complexes, the ATP and the substrate pepti...
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It is proposed that enzymic phosphoryl-transfer reactions occur by concerted, step-wise, associative (phosphorane-intermediate) or dissociative (metaphosphate-intermediate) mechanisms, as dictated by the catalytic scaffold and the reactants. During the evolution of a phosphotransferase family, the mechanism of the phosphoryl-transfer reaction is in constant flux, potentially changing with each ...
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Quantifying the rate of phosphate monoester dianion hydrolysis under physiological conditions has implications for designing transition state mimics and understanding how catalysis is facilitated. Catalysis is energetically most efficient if the mechanistic pathway in solution is stabilised. Monoesters are believed to have a "dissociative" transition state that has little bonding to the nucleop...
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We have used vibrational spectroscopy to study bonding in monosubstituted dianionic phosphates, both to learn more about basic properties intrinsic to this important class of biological substrates and to assess the ability of vibrational spectroscopy to provide a "sensor" or probe of the local environment experienced by the phosphoryl group. We examined the bonding properties of the phosphoryl ...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1992
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)35837-x