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• W2008049325 abstract "NAD-glycohydrolase (AA-NADase) from Agkistrodon acutus venom is a unique multicatalytic enzyme with both NADase and AT(D)Pase-like activities. Among all identified NADases, only AA-NADase is a disulfide-linked dimer and contains Cu(2+). Cu(2+) and disulfide bonds are essential for its multicatalytic activity. In this study, the effects of Cu(2+) and disulfide-bonds on guanidine hydrochloride (GdnHCl)- and thermal-induced unfolding of AA-NADase have been investigated by fluorescence, circular dichroism (CD) and differential scanning calorimetry (DSC). Cu(2+) and disulfide bonds not only increase the free energy change during the GdnHCl-induced unfolding as determined by fluorescence, but also increase the overall enthalpy change and the transition temperature during the thermal-induced unfolding as determined by CD and DSC. The slope of the GdnHCl-induced unfolding curve at its midpoint and the heat capacity of thermal-induced unfolding are slightly affected by Cu(2+) but significantly decrease after reduction of three disulfide-bonds. This work suggests that Cu(2+) stabilizes the folded state by increasing the enthalpy of unfolding, while disulfide-bonds stabilize the folded state by increasing the enthalpy of unfolding and stabilizing the packing of hydrophobic residues. Thus both Cu(2+) and disulfide bonds play a structural role in its multicatalytic activity." @default.
• W2008049325 created "2016-06-24" @default.
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• W2008049325 date "2012-01-01" @default.
• W2008049325 modified "2023-09-27" @default.
• W2008049325 title "Cu(ii)- and disulfide bonds-induced stabilization during the guanidine hydrochloride- and thermal-induced denaturation of NAD-glycohydrolase from the venom of Agkistrodon acutus" @default.
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• W2008049325 doi "https://doi.org/10.1039/c1mt00135c" @default.
• W2008049325 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22045055" @default.
• W2008049325 hasPublicationYear "2012" @default.
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