Biochemical and In Silico Characterization of a Recombinant, Highly Thermostable α-Glucosidase from Thermococcus radiotolerans DSM-15228
Hayam Albalawi1,2, Muhammad Shahid Nadeem1*, Hisham N. Altayeb1,
Saima Iftikhar3, Mariam A. Al-Ghamdi1,4,5, Jalaluddin Azam Khan1 and Ahmed Osman1
1Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
2Department of Biochemistry, Faculty of Science, University of Tabuk, Tabuk 71421, Saudi Arabia.
3School of Biological Sciences, University of the Punjab, Lahore 54000, Pakistan.
4Vitamin D Pharmacogenomics Research Group, King Abdulaziz University, Jeddah, Saudi Arabia.
5Experimental Biochemistry Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 22252, Saudi Arabia
Fig. 1.
SDS-PAGE showing the expression and purification of α-glucosidase. Lane C, a control experiment (without the gene), Lane-M, Protein marker (Thermofisher - unstained protein ruler). Lane E, experimental with the expression of the gene. P, purified enzyme, the molecular weight of the purified enzyme was found as 30 kDa.
Fig. 2.
A study of the kinetics of recombinant α-glucosidase. A, Enzyme stability against temperature. B, Effects of temperature on enzyme activity. C, Lineweaver-Burk plot for Km and Vmax. D, Effects of pH on enzyme activity.
Fig. 3.
Depicts a 3D interaction of alpha-glucosidase and acarbose. Panel A shows an enlarged model of the complex, highlighting the ligand in the active site of bacterial alpha-glucosidase. Panel B provides a closer view of the complex, with the ligand displayed in the center of human alpha-glucosidase.
Fig. 4.
Depicts a 2D interaction of alpha-glucosidase and acarbose. A, enlarged model of the complex, highlighting the ligand in the active site of bacterial alpha-glucosidase. B, provides a closer view of the complex, with the ligand displayed in the center of human alpha-glucosidase.
Table II.
Molecular docking of α-glucosidase with its potential inhibitors a comparison of human and Thermococcus enzyme.