Journal: International Journal of Molecular Sciences
Article Title: Structure-Based Modeling of Sigma 1 Receptor Interactions with Ligands and Cholesterol and Implications for Its Biological Function
doi: 10.3390/ijms241612980
Figure Lengend Snippet: Proposed conformational equilibrium of S1R. ( A ) Schematic depiction of dynamic monomer (DM) conformation and anchored monomer (AM) conformations of S1R. Possible movements of H1 α-helix (m1), H4/5 α-helices (m2) and unfolding of BIND domain (m3) are shown. The equilibrium between DM and AM conformations is affected by S1R agonists, S1R antagonists, cholesterol (CHO) in the membrane and E102Q pathogenic mutation, as shown. ( B ) Proposed distribution of different S1R conformations. AM conformation is well defined and forms a narrow peak in conformational space. DM conformation is a spectrum of molecular species that differ from each other in the tilt of H1 α-helix, position of H4/5 α-helices relative to the surface of the membrane and the folding state of BIND domain. As a result, DM conformation forms a broad peak in conformational space.
Article Snippet: To investigate the secondary structures of S1R protein, PDB files of human S1R (hS1R) and Xenopus S1R (xS1R) structures determined with X-ray diffraction (XRD) were obtained from the databank—5HK1 (hS1R bound to PD144418) [ ], 5HK2 (hS1R bound to 4-IBP) [ ], 6DK0 (hS1R bound to NE-100) [ ], 6DJZ (hS1R bound to haloperidol) [ ], 6DK1 (hS1R bound to (+)-pentazocine) [ ], 7W2F (xS1R bound to PRE084) [ ] and 7W2D (xS1R bound to S1RA) [ ].
Techniques: Membrane, Mutagenesis