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Human Salivary Aldehyde Dehydrogenase: Purification, Kinetic Characterization and Effect of Ethanol, Hydrogen Peroxide and Sodium Dodecyl Sulfate on the Activity of the Enzyme

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Abstract

Human salivary aldehyde dehydrogenase (hsALDH) enzyme appears to be the first line of defense in the body against exogenous toxic aldehydes. However till date much work has not been done on this important member of the ALDH family. In this study, we have purified hsALDH to homogeneity by diethylaminoethyl-cellulose (DEAE-cellulose) ion-exchange chromatography in a single step. The molecular mass of the homodimeric enzyme was determined to be approximately 108 kDa. Four aromatic substrates; benzaldehyde, cinnamaldehyde, 2-naphthaldehyde and 6-methoxy-2-naphthaldehyde were used for determining the activity of pure hsALDH. K m values for these substrates were calculated to be 147.7, 5.31, 0.71 and 3.31 μM, respectively. The best substrates were found to be cinnamaldehyde and 2-naphthaldehyde since they exhibited high V max /K m values. 6-methoxy-2-naphthaldehyde substrate was used for further kinetic characterization of pure hsALDH. The pH and temperature optima of hsALDH were measured to be pH 8 and 45 °C, respectively. The pure enzyme is highly unstable at high temperatures. Ethanol, hydrogen peroxide and SDS activate hsALDH, therefore it is safe and beneficial to include them in mouthwashes and toothpastes in low concentrations.

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Abbreviations

ALDH:

Aldehyde dehydrogenases

hsALDH:

Human salivary aldehyde dehydrogenase

SDS–PAGE:

Sodium dodecyl sulfate–polyacrylamide gel electrophoresis

K m :

Michaelis constant

V max :

Maximum velocity

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Acknowledgments

Facilities provided by Aligarh Muslim University are gratefully acknowledged. M.F. Alam and A.A. Laskar are research fellows of Department of Biotechnology (DBT), India.

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Authors and Affiliations

  1. Enzymology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India

    Md. Fazle Alam, Amaj Ahmed Laskar, Hadi Hasan Choudhary & Hina Younus

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  1. Md. Fazle Alam
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  2. Amaj Ahmed Laskar
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  3. Hadi Hasan Choudhary
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  4. Hina Younus
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Correspondence to Hina Younus.

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Alam, M.F., Laskar, A.A., Choudhary, H.H. et al. Human Salivary Aldehyde Dehydrogenase: Purification, Kinetic Characterization and Effect of Ethanol, Hydrogen Peroxide and Sodium Dodecyl Sulfate on the Activity of the Enzyme. Cell Biochem Biophys 74, 307–315 (2016). https://doi.org/10.1007/s12013-016-0742-9

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  • DOI: https://doi.org/10.1007/s12013-016-0742-9

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