The conformation of epinephrine in polar solvents: an NMR study
Abstract
Epinephrine (Epi) is a physiologically important catecholamine. Molecular conformation of Epi controls the interactions with other molecules and its biological effects. There have been a number of theoretical studies addressing conformation and hydrogen bonding of Epi in different solvents, but experimental data are scarce. Herein, we applied H-1 NMR, H-1-H-1 COSY, H-1-N-15 HSQC, and NOESY to examine and compare the conformation of Epi in polar solvents-dimethyl sulfoxide (DMSO) and water. The main differences were observed for NH2 and CH2 groups. Both showed chemical nonequivalence of protons in DMSO that was not present in water. The analysis of the effects of increasing temperature and solvent substitution on NMR signals showed that one of the protons in amine group forms a strong intramolecular hydrogen bond with aliphatic OH group, which is H-donor in another hydrogen bond with DMSO. NOESY provided data on the spatial positions of protons in the side chain, allowing for 3D model o...f the structure of Epi in DMSO to be built. In close, Epi molecule forms an additional 5-membered ring that encompasses bifurcate intra-/intermolecular hydrogen bonds, and acquires conformation that resembles the shape of a "scorpion"-the catechol ring representing the body and the side chain being a forward-curved tail. The conformation of Epi in water lacks the intramolecular hydrogen bond and most likely largely depends on hydrogen bonds with water molecules.
Keywords:
Adrenaline / Amine / Dimethyl sufoxide / Hydrogen bond / Intramolecular / NOESYSource:
Structural Chemistry, 2018, 29, 5, 1533-1541Publisher:
- Springer/Plenum Publishers, New York
Funding / projects:
DOI: 10.1007/s11224-018-1144-y
ISSN: 1040-0400
WoS: 000442621000027
Scopus: 2-s2.0-85048559076
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Institution/Community
IHTMTY - JOUR AU - Korac, Jelena AU - Todorović, Nina AU - Zakrzewska, Joanna AU - Zizic, Milan AU - Spasojević, Ivan PY - 2018 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/2426 AB - Epinephrine (Epi) is a physiologically important catecholamine. Molecular conformation of Epi controls the interactions with other molecules and its biological effects. There have been a number of theoretical studies addressing conformation and hydrogen bonding of Epi in different solvents, but experimental data are scarce. Herein, we applied H-1 NMR, H-1-H-1 COSY, H-1-N-15 HSQC, and NOESY to examine and compare the conformation of Epi in polar solvents-dimethyl sulfoxide (DMSO) and water. The main differences were observed for NH2 and CH2 groups. Both showed chemical nonequivalence of protons in DMSO that was not present in water. The analysis of the effects of increasing temperature and solvent substitution on NMR signals showed that one of the protons in amine group forms a strong intramolecular hydrogen bond with aliphatic OH group, which is H-donor in another hydrogen bond with DMSO. NOESY provided data on the spatial positions of protons in the side chain, allowing for 3D model of the structure of Epi in DMSO to be built. In close, Epi molecule forms an additional 5-membered ring that encompasses bifurcate intra-/intermolecular hydrogen bonds, and acquires conformation that resembles the shape of a "scorpion"-the catechol ring representing the body and the side chain being a forward-curved tail. The conformation of Epi in water lacks the intramolecular hydrogen bond and most likely largely depends on hydrogen bonds with water molecules. PB - Springer/Plenum Publishers, New York T2 - Structural Chemistry T1 - The conformation of epinephrine in polar solvents: an NMR study VL - 29 IS - 5 SP - 1533 EP - 1541 DO - 10.1007/s11224-018-1144-y ER -
@article{ author = "Korac, Jelena and Todorović, Nina and Zakrzewska, Joanna and Zizic, Milan and Spasojević, Ivan", year = "2018", abstract = "Epinephrine (Epi) is a physiologically important catecholamine. Molecular conformation of Epi controls the interactions with other molecules and its biological effects. There have been a number of theoretical studies addressing conformation and hydrogen bonding of Epi in different solvents, but experimental data are scarce. Herein, we applied H-1 NMR, H-1-H-1 COSY, H-1-N-15 HSQC, and NOESY to examine and compare the conformation of Epi in polar solvents-dimethyl sulfoxide (DMSO) and water. The main differences were observed for NH2 and CH2 groups. Both showed chemical nonequivalence of protons in DMSO that was not present in water. The analysis of the effects of increasing temperature and solvent substitution on NMR signals showed that one of the protons in amine group forms a strong intramolecular hydrogen bond with aliphatic OH group, which is H-donor in another hydrogen bond with DMSO. NOESY provided data on the spatial positions of protons in the side chain, allowing for 3D model of the structure of Epi in DMSO to be built. In close, Epi molecule forms an additional 5-membered ring that encompasses bifurcate intra-/intermolecular hydrogen bonds, and acquires conformation that resembles the shape of a "scorpion"-the catechol ring representing the body and the side chain being a forward-curved tail. The conformation of Epi in water lacks the intramolecular hydrogen bond and most likely largely depends on hydrogen bonds with water molecules.", publisher = "Springer/Plenum Publishers, New York", journal = "Structural Chemistry", title = "The conformation of epinephrine in polar solvents: an NMR study", volume = "29", number = "5", pages = "1533-1541", doi = "10.1007/s11224-018-1144-y" }
Korac, J., Todorović, N., Zakrzewska, J., Zizic, M.,& Spasojević, I.. (2018). The conformation of epinephrine in polar solvents: an NMR study. in Structural Chemistry Springer/Plenum Publishers, New York., 29(5), 1533-1541. https://doi.org/10.1007/s11224-018-1144-y
Korac J, Todorović N, Zakrzewska J, Zizic M, Spasojević I. The conformation of epinephrine in polar solvents: an NMR study. in Structural Chemistry. 2018;29(5):1533-1541. doi:10.1007/s11224-018-1144-y .
Korac, Jelena, Todorović, Nina, Zakrzewska, Joanna, Zizic, Milan, Spasojević, Ivan, "The conformation of epinephrine in polar solvents: an NMR study" in Structural Chemistry, 29, no. 5 (2018):1533-1541, https://doi.org/10.1007/s11224-018-1144-y . .