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• W2771893886 abstract "Kex2 is the prototype of a large family of eukaryotic subtilisin-related proprotein-processing proteases that cleave at sites containing pairs of basic residues. Here, we studied the effects of KCl on the individual rate constants of association, dissociation, acylation and deacylation and determined the thermodynamic parameters at each step of the Kex2 reaction. Potassium bound Kex2 with KD=20.3mM. The order in which potassium entered the reaction system modified the effect of activation or inhibition, which depended on the size of the substrate. A possible allosteric potassium binding site at the S6 subsite was involved in activation, and a distant site located between the catalytic domain and the P-domain was involved in inhibition. Potassium decreased the energetic barriers of almost all steps of catalysis. The acylation of Ac-PMYKR-AMC in the absence of potassium was the rate-limiting step. Therefore, for substrates containing a P1-Arg, the deacylation step is not necessarily the rate-limiting event, and other residues at the P' positions may participate in controlling the acylation and deacylation steps. Thus, it is reasonable to conclude that potassium is involved in the processing of the α-mating factor that promotes Ca2+ mobilization by activating a high-affinity Ca2+-influx system to increase the cytosolic [Ca2+], resulting in the activation of channels that are essential for the survival of Saccharomyces cerevisiae cells." @default.
• W2771893886 created "2017-12-22" @default.
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• W2771893886 date "2018-04-01" @default.
• W2771893886 modified "2023-10-14" @default.
• W2771893886 title "Thermodynamic analysis of Kex2 activity: The acylation and deacylation steps are potassium- and substrate-dependent" @default.
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• W2771893886 doi "https://doi.org/10.1016/j.bpc.2017.11.007" @default.
• W2771893886 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29432900" @default.
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