The subcellular distribution of small molecules: a meta-analysis

Area of Science:

• Pharmacology
• Cell Biology
• Cheminformatics

Background:

• Knowledge of organelle-targeting features of small molecules is limited.
• Controlling exogenous chemical agent accumulation and distribution within cells is a challenge.

Purpose of the Study:

• To assess the applicability of current knowledge on organelle-targeting features of small molecules.
• To explore controlling the accumulation and distribution of exogenous chemical agents inside cells.

Main Methods:

• Compiled a dataset of molecules with known subcellular localization properties.
• Compared this dataset to reference datasets of approved drugs (DrugBank) and random molecules (PubChem).
• Performed cheminformatic analysis of physicochemical properties and molecular weight.

Main Results:

• Molecules with reported subcellular localizations showed diverse physicochemical properties with significant overlap between organelles.
• Compared to drug and random molecule datasets, targeted molecules were larger, more complex, and more lipophilic.
• Physicochemical property trends for organelle localization reversed between smaller and larger molecules, likely due to size-dependent transport mechanisms.

Conclusions:

• Subcellular targeting strategies benefit from analyzing biodistribution effects related to molecular size variations.
• Molecular weight significantly impacts molecule accumulation and distribution within cells.
• Exploiting structure-localization relationships requires considering molecular size and its influence on transport mechanisms.