Abstract
Arginine-vasopressin was subjected to a long (11 μs) molecular dynamics simulation in aqueous solution. Analysis of the results by DASH and principal components analyses revealed four main ring conformations that move essentially independently of the faster-moving tail region. Two of these conformations (labeled “saddle”) feature well-defined β-turns in the ring and conserved transannular hydrogen bonds, whereas the other two (“open”) feature neither. The conformations have been identified and defined and are all of sufficient stability to be considered candidates for biological conformations in their cognate receptors.
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Acknowledgments
This work was supported by the European project “Peptide Research Network of Excellence” PeReNE as part of the Interreg IVA France (Channel)—England 2007–2014 program (Interreg EU). We thank Jonathan Essex (University of Southampton, UK) and Ronan Bureau (University of Caen, France) for helpful discussions and Harald Lanig (University of Erlangen, Germany) for support with the simulations. Work in Erlangen was supported by the Deutsche Forschungsgemeinschaft as part of Graduiertenkolleg 1910 “Medicinal Chemistry of Selective GPCR Ligands”.
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Glossary
- Abs
-
Absolute
- AMBER
-
Assisted Model Building with Energy Refinement
- av
-
Average
- AVP
-
8-Arginine-Vasopressin
- cl.open
-
Clinched Open
- DASH
-
Dynamics Analysis by Salt and Hudson
- DMS
-
Dimethyl Sulfate
- ff99sb
-
Force Field 1999 Stony Brooks
- g/g′
-
gauche/gauche′
- GPCR
-
G-Protein Coupled Receptor
- Hbond
-
Hydrogen Bond
- MD
-
Molecular Dynamics
- NH
-
Amide Hydrogen
- NP
-
Neurophysin
- O
-
Carbonyl Oxygen
- OT
-
Oxytocin
- PC
-
Principle Component
- PCA
-
Principle Component Analysis
- PDB
-
Protein Data Bank
- RadGyr
-
Radius of Gyration
- Rel
-
Relative
- RMSD
-
Root Mean Square Deviation
- SDS
-
Sodium Dodecyl Sulfate
- StdDev
-
Standard Deviation
- T10
-
DASH analysis of torsions Φ/Ψ 2 to 6 (10 torsions)
- T16
-
DASH analysis of torsions Φ/Ψ 2 to 9 (16 torsions)
- TIP4P-Ew
-
Transferable Intermolecular Potential 4 Point - Ewald
- TM
-
Trans Membrane
- tw.saddle
-
Twisted Saddle
- V2R
-
Vasopressin-2 receptor
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Haensele, E., Banting, L., Whitley, D.C. et al. Conformation and dynamics of 8-Arg-vasopressin in solution. J Mol Model 20, 2485 (2014). https://doi.org/10.1007/s00894-014-2485-0
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DOI: https://doi.org/10.1007/s00894-014-2485-0