The liver is the main site of drug metabolism in human body. Drug metabolism in liver, converting lipophilic substrates
into more polar products which are easily excreted form, occurs in two steps, phase I and phase II. Especially, phase II
metabolism is important because it is fast pathway for drug elimination and closely related with excretion, but still practical
models are not available. Generally, phase II transformations conjugate a highly polar group to the substrates, then produce
more hydrophilic products than its substrates. We categorized these metabolic reactions into four major classes. The reactions
are glucuronidation, sulfation, N-acetylation and glutathione conjugation, and enzymes responsible for those reactions are
UDP-glucoronosyl transferase (UGT), sulfotransferase (SULT), N-acetyltransferase (NAT) and glutathione transferase
(GST) respectively. We made four
substrate classification models using random forest method. ECFP_4 is selected as
molecular descriptor. ECFPs are topological fingerprints for molecular characterization using Morgan algorithm to capture
molecular features. These models effectively predict phase II transformational fate of a drug molecule. And we also found that
suggestion of important substructure features is possible by statistical analysis of random forest models.
Hyoungjun Son is a graduate student and currently Ph.D candidate at Yonsei University.
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