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• W2775690846 abstract "Human salivary aldehyde dehydrogenase (hsALDH) is primarily a class 3 ALDH (ALDH3A1), and is an important antioxidant enzyme present in the saliva which maintains healthy oral cavity. It detoxifies toxic aldehydes into non-toxic carboxylic acids in the oral cavity. Reduced level of hsALDH activity is a risk factor for oral cancer development. It is involved in the resistance of certain chemotherapeutic drugs. Coffee has been reported to affect the activity of salivary ALDH. In this study, the effect of caffeine on the activity (dehydrogenase and esterase) of hsALDH was investigated. The binding of caffeine to hsALDH was studied using different biophysical methods and molecular docking analysis. Caffeine was found to inhibit both crude and purified hsALDH. The Km increased and the Vmax decreased showing a mixed type of inhibition. Caffeine decreased the nucleophilicity of the catalytic cysteine residue. It binds to the active site of ALDH3A1 by forming a complex through non-covalent interactions with some highly conserved amino acid residues. It partially alters the secondary structure of the enzyme. Therefore, it is very likely that caffeine binds and inhibits the activity of hsALDH by decreasing substrate binding affinity and the catalytic efficiency of the enzyme. The study indicates that oral intake of caffeine may have a harmful effect on the oral health and may increase the risk of carcinogenesis through the inhibition of this important enzyme. Further, the inactivation of oxazaphosphorine based chemotherapeutic drugs by ALDH3A1 may be prevented by using caffeine as an adjuvant during medication which is expected to increase the sensitivity of these drugs through its inhibitory effect on the enzyme." @default.
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• W2775690846 date "2018-04-01" @default.
• W2775690846 modified "2023-09-24" @default.
• W2775690846 title "Kinetic and biophysical investigation of the inhibitory effect of caffeine on human salivary aldehyde dehydrogenase: Implications in oral health and chemotherapy" @default.
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• W2775690846 doi "https://doi.org/10.1016/j.molstruc.2017.12.050" @default.
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