Abstract
The structural dynamics of three different ligand-activated G-protein coupled receptors (GPCRs) and the photoreactive receptor rhodopsin from mammals were comparatively studied. As a result, diagrams demonstrating the main structural differences between the studied membrane receptors were obtained. These diagrams represent the projection of the crystal structures of rhodopsin photointermediates and ligand-activated receptors onto the plane defined by the principal components. Thus, we were able to associate the activation process of the receptors with large-scale movements of their individual transmembrane (TM) domains. In addition, the dynamics of extracellular loops of ligand-activated receptors responsible for recognition and initial binding of ligands was studied. Based on these results, two parameters of functionally significant structural dynamics of membrane receptors can be thoroughly analyzed simultaneously — movements of individual TM helices and of extracellular loops.
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Abbreviations
- β-1AR:
-
β-1-adrenergic receptor
- β-2AR:
-
β-2-adrenergic receptor
- GPCR:
-
G-protein coupled receptors
- PCA:
-
principal component analysis
- PC1:
-
the first principal component
- PDB:
-
Protein Data Bank
- RMSD:
-
root-meansquare deviation
- 7TM receptors:
-
seven transmembrane domain receptors
- TMD:
-
transmembrane domain
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Original Russian Text © G. V. Novikov, V. S. Sivozhelezov, K. V. Shaitan, 2013, published in Biokhimiya, 2013, Vol. 78, No. 4, pp. 522–532.
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Novikov, G.V., Sivozhelezov, V.S. & Shaitan, K.V. Study of structural dynamics of ligand-activated membrane receptors by means of principal component analysis. Biochemistry Moscow 78, 403–411 (2013). https://doi.org/10.1134/S0006297913040093
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DOI: https://doi.org/10.1134/S0006297913040093