Designing Molecules to Treat Neurologic and Ophthalmologic Diseases Caused by Sorbitol Excess: Engineering the Agrobacterium Vitis Protein

Abstract This work presents the design of a new protein based on the adenosine triphosphate-binding cassette (ABC) transporter solute binding protein (SBP). The Protein Data Bank in Europe's dictionary of chemical components was utilized to identify sorbitol and D-allitol. Allitol bound to an ABC transporter SBP was identified in the Research Collaboratory for Structural Bioinformatics Protein Data Bank (RCSB). Wizard Pair Fitting and Sculpting tools in PyMOL were used to replace bound allitol with sorbitol. PackMover Python code was used to induce mutations in the ABC transporter SBP’s binding pocket, and changes in free energy for each protein-sorbitol complex were identified. The results indicate that charged side chains form polar bonds with sorbitol in the binding pocket, thus increasing its stabilization. In theory, the novel protein can be used as a molecular sponge to remove sorbitol from tissue and therefore treat conditions affected by sorbitol dehydrogenase deficiency.