Evaluating hydrophobic galactonoamidines as transition state analogs for enzymatic beta-galactoside hydrolysis
by Pickens, Jessica B.; Mills, Logan G.; Wang, Feng; Striegler, Susanne
A spectroscopic examination of six galactonoamidines with inhibition constants and efficacy in the low nanomolar concentration range (K-i = 6-11 nM, IC50 = 12-36 nM) suggested only two of them as putative transition state analogs for the hydrolysis of beta-galactosides by beta-galactosidase (A. oryzae). A rationale for the experimental results was elaborated using docking and molecular dynamics studies. An analysis of the combined observations reveals several common factors of the compounds suggested as transition state analogs (TSAs): the putative TSAs have a similar orientation in the active site; show conserved positioning of the glycon; display a large number of H-bond interactions toward the catalytically active amino acid residues via their glycon; and exhibit hydrophobic interactions at the outer rim of the active site with small changes of the position and orientation of their respective aglycons.
- Journal
- Bioorganic Chemistry
- Volume
- 77
- Year
- 2018
- Start Page
- 144-151
- URL
- https://dx.doi.org/10.1016/j.bioorg.2018.01.012
- ISBN/ISSN
- 1090-2120; 0045-2068
- DOI
- 10.1016/j.bioorg.2018.01.012