Comparative structural and functional analysis of STL and SLL, chitin-binding lectins from Solanum spp.

Abstract

Therapeutically important chitin-binding lectins have been already reported in the literature for Solanum tuberosum and Solanum lycopersicum, but their structural data are unavailable. Therefore, we have done comparative structural and functional analysis of chitin-binding lectins from S. tuberosum (STL) and S. lycopersicum (SLL). From the sequence analysis, it has been observed that there is high percentage of proline residues in STL and SLL, 21% and 30% respectively. We utilized the hybrid homology modeling-ab initio approaches to predict the 3D structures of STL and SLL, which are used for in silico interaction studies with N,N’-Diacetylchitobiose, Triacetylchitotriose and Tetra-N-acetylglucosamine. The best STL-glycan and SLL-glycan complexes were subjected to Molecular dynamics simulation to understand and compare the structural stability and the binding patterns of glycans toward STL and SLL. We observed that the structural stability of the STL and SLL had been improved significantly due to the binding of glycans. Together with the results of global, essential dynamics and MM-PBSA analysis, indicated that N,N’-Diacetylchitobiose has more binding affinity towards STL, whereas Triacetylchitotriose has more binding affinity with SLL. This comprehensive and comparative structural and functional analysis provides critical insights about the structures and their binding sites, binding orientation, and binding affinity of chitin oligomers towards the structures of STL and SLL. These findings can be used to design further experimental studies to explore the potential therapeutic properties of STL and SLL. Communicated by Ramaswamy H. Sarma