Endomorphin-2

(based on a converted SMILES found on en.wikipedia.org/wiki/Endomorphin-2

This file shows a converted Wikipedia SMILES file of endomorphin2, a small peptide chain that functions a high affinity agonist of the mu opioid receptor, nature's morphine if you will. Unlike the longer endorphin molecule, this molecules 3D structure has been determined.
The spacefilled model of the two bonding regions (phenylalanine residues are shown in gold) of endomorphin
The wireframe model of the two bonding regions(gold) of endomorpin-2
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Some Important References
1. Opioid peptide. (2019). En.wikipedia.org. Retrieved 17 March 2019, from https://en.wikipedia.org/wiki/Opioid_peptide
2. Pasternak, G., & Pan, Y. (2013). Mu Opioids and Their Receptors: Evolution of a Concept. Pharmacological Reviews, 65(4), 1257-1317. doi:10.1124/pr.112.007138 3. Honda, T., Shirasu, N., Isozaki, K., Kawano, M., Shigehiro, D., & Chuman, Y. et al. (2007). Differential receptor binding characteristics of consecutive phenylalanines in μ-opioid specific peptide ligand endomorphin-2. Bioorganic & Medicinal Chemistry, 15(11), 3883-3888. doi:10.1016/j.bmc.2007.03.009

Leu-enkephalin

(based on a converted SMILES found on en.wikipedia.org/wiki/Leu-enkephalin

This model shows another endogenous opioid neurotransmitter. This five peptide structure has the amino acid sequence Tyr-Gly-Gly-Phe-Leu. In addition to initiating signaling through the mu opioid receptor, it also activates the delta opioid receptor as well.
The three different sites(gold) in which leu-enkephalinen bonds to the mu opioid receptor
A wireframe model of leu-enkephalinen
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