Neurotransmitter released in the synaptic cleft binds to specific receptors on the post-synaptic cell and the excess of the neurotransmitter is cleared to prevent over activation of the post-synaptic cell. The neurotransmitter is cleared by either re-uptake by the pre-synaptic neuron, diffusion in the perisynaptic area, uptake by astrocytes surrounding the synaptic cleft or enzymatic degradation of the neurotransmitter. This topic will be annotated in a future release.
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This CandidateSet contains sequences identified by William Pearson's analysis of Reactome catalyst entities. Catalyst entity sequences were used to identify analagous sequences that shared overall homology and active site homology. Sequences in this Candidate set were identified in an April 24, 2012 analysis.
Acetylcholinesterase (ACHE) oligomers (comprising monomers, dimers and tetramers), anchored to the extracellular side of the plasma membrane, hydrolyze acetylcholine (AcCho) to form choline (Cho) and acetate (Weinstock & Groner 2008, Velan et al. 1991, Kryger et al. 2000).
Acetylcholine from the synaptic cleft is degraded into inactive molecules, Cho and acetate by ACHE, which is located in the synaptic cleft (Weinstock & Groner 2008).
The human gene SLC6A4 encodes the sodium-dependent serotonin transporter 5HTT which mediates the re-uptake of serotonin from the synaptic cleft thus terminating the action of serotonin (Canli T and Lesch KP, 2007). The serotonin taken up in the cytosol from the synaptic cleft may be recycled into synaptic vesicles or metabolized.
The human gene SLC6A3 encodes the sodium-dependent dopamine transporter, DAT which mediates the re-uptake of dopamine from the synaptic cleft (Vandenbergh DJ et al, 2000). Dopamine can then be degraded by either COMT or monoamine oxidase.
Dopamine in the cytosol is metabolized to 3-methoxytyramine by catecholamine o-methyltransferase (COMT), which uses s-adenosylmethionine as a methyl group donor.
3,4-dihydroxyphenylacetic acid, generated after oxidation of dopamine by monoamineoxidase, is methylated by catecholamine o-methyltransferase to homovanillic acid.
At the beginning of this reaction, 1 molecule of 'Oxygen', 1 molecule of 'H2O', and 1 molecule of '5-Hydroxytryptamine' are present. At the end of this reaction, 1 molecule of 'NH3', 1 molecule of '5-Hydroxyindoleacetaldehyde', and 1 molecule of 'H2O2' are present.
This reaction takes place in the 'mitochondrial outer membrane' and is mediated by the 'amine oxidase activity' of 'MAOA-FAD complex'.
This topic will be annotated in a future release.
Original Pathway at Reactome: http://www.reactome.org/PathwayBrowser/#DB=gk_current&FOCUS_SPECIES_ID=48887&FOCUS_PATHWAY_ID=112311
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Acetylcholine from the synaptic cleft is degraded into inactive molecules, Cho and acetate by ACHE, which is located in the synaptic cleft (Weinstock & Groner 2008).
This reaction takes place in the 'mitochondrial outer membrane' and is mediated by the 'amine oxidase activity' of 'MAOA-FAD complex'.