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| ===Mechanism of Action=== | | ===Mechanism of Action=== |
| <scene name='Galantamine/Ache/1'>TextToBeDisplayed</scene>
| | Galantamine is a potent [[Acetylcholinesterase]] (AChE) inhibitor to the active site of <scene name='Galantamine/Ache/1'>AChE</scene>. By inhibiting AChE, the important neurotransmitter, [[acetylcholine]], is degraded at a slower rate, helping reverse the marked decrease in neuronal function evident in [[Alzheimer's Disease]] patients. Galantamine binds to the same active site gorge as acetylcholine <scene name='Galantamine/Binding/1'>interacting with the residues</scene> Glu 199, Phe 330, Trp 84, His 440, Phe 288, PHe 290, Tyr 121, Phe 331, Gly 119, Ser 200, Gly 118, and Gly 117 to tightly bind to AChE<ref name="Guillou">PMID:15563167</ref>. These interactions, which are primarily hydrophobic and pi stacking interactions, allow Galantamine outcompete Acetylcholine for the AChE active site. |
| <scene name='Galantamine/Binding/1'>TextToBeDisplayed</scene>
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| Described above, <scene name='1w4l/Al/1'>Galantamine</scene> (abbreviated as <scene name='1w4l/Al/2'>GAL</scene>; <font color='red'><b>colored red</b></font>) is a CAS-binding inhibitor and it is currently used in therapy of the AD. Conjugate of GAL through the <scene name='1w4l/Al/3'>alkyl linker</scene> (8 carbons, <font color='black'><b>yellow</b></font>) with a <scene name='1w4l/Al/4'>phthalimido moiety</scene> <font color='blueviolet'><b>(blueviolet)</b></font> called '''compound 3''' has a larger affinity for AChE than that of GAL alone. This is similar to previously described cases of bivalent ligands (''e.g.'' '''(''RS'')-(±)-tacrine-(10)-hupyridone'''). A comparison between <scene name='1w4l/Comparison/1'>compound 3</scene>/''Tc''AChE ([[1w4l]]) and <scene name='1w4l/Comparison/2'>galanthamine/TcAChE</scene> structure ([[1dx6]]) shows an identical binding mode of the <font color='red'><b>GAL-moiety (transparent red)</b></font> of '''compound 3''' to that of <font color='blue'><b>GAL alone (blue)</b></font> at the CAS. A <font color='gray'><b>PEG molecule (gray)</b></font> is located at the active site of the galanthamine/''Tc''AChE structure. The alkyl linker spans the active-site gorge and the phthalimido moiety of '''compound 3''' is situated near Trp279 at the PAS. '''Compound 3''' has higher affinity to ''Tc''AChE than GAL. This can be explained by the higher number of interactions between '''compound 3''' (which interacts not only with residues within CAS but also within PAS) and ''Tc''AChE relative to GAL <ref name="Guillou">PMID:15563167</ref>.
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| ===Pharmacokinetics=== | | ===Pharmacokinetics=== |