title: Multivariate PLS Modeling of Apicomplexan FabD-Ligand Interaction Space for Mapping Target-Specific Chemical Space and Pharmacophore Fingerprints.
abstract: Biomolecular recognition underlying drug-target interactions is determined by both binding affinity and specificity. Whilst, quantification of binding efficacy is possible, determining specificity remains a challenge, as it requires affinity data for multiple targets with the same ligand dataset. Thus, understanding the interaction space by mapping the target space to model its complementary chemical space through computational techniques are desirable. In this study, active site architecture of FabD drug target in two apicomplexan parasites viz. Plasmodium falciparum (PfFabD) and Toxoplasma gondii (TgFabD) is explored, followed by consensus docking calculations and identification of fifteen best hit compounds, most of which are found to be derivatives of natural products. Subsequently, machine learning techniques were applied on molecular descriptors of six FabD homologs and sixty ligands to induce distinct multivariate partial-least square models. The biological space of FabD mapped by the various chemical entities explain their interaction space in general. It also highlights the selective variations in FabD of apicomplexan parasites with that of the host. Furthermore, chemometric models revealed the principal chemical scaffolds in PfFabD and TgFabD as pyrrolidines and imidazoles, respectively, which render target specificity and improve binding affinity in combination with other functional descriptors conducive for the design and optimization of the leads.
authors.affiliation: Molecular Biophysics Unit, Indian Institute of Science, Bangalore, Karnataka, India.
authors.forename: Ashalatha Sreshty
authors.initials: AS
authors.lastname: Mamidi
authors.affiliation: Molecular Biophysics Unit, Indian Institute of Science, Bangalore, Karnataka, India.
authors.forename: Prerna
authors.initials: P
authors.lastname: Arora
authors.affiliation: Molecular Biophysics Unit, Indian Institute of Science, Bangalore, Karnataka, India.
authors.forename: Avadhesha
authors.initials: A
authors.lastname: Surolia
mesh_terms: D051051:Acyl-Carrier Protein S-Acetyltransferase / Q000037:antagonists & inhibitors / Q000737:chemistry; D000962:Antimalarials / Q000737:chemistry*; D016503:Drug Delivery Systems; D004791:Enzyme Inhibitors / Q000737:chemistry*; D008956:Models, Chemical; D010963:Plasmodium falciparum / Q000201:enzymology*; D015800:Protozoan Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry; D014122:Toxoplasma / Q000201:enzymology*
chemical_list: D000962:Antimalarials; D004791:Enzyme Inhibitors; D015800:Protozoan Proteins; D051051:Acyl-Carrier Protein S-Acetyltransferase