An indel in transmembrane helix 2 helps to trace the molecular evolution of class A G-protein-coupled receptors.

Abstract excerpt

Class A G-protein-coupled receptors (GPCRs) constitute a large family of transmembrane receptors. Helical distortions play a major role in the overall fold of these receptors. Most are related to conserved proline residues. However, in transmembrane helix 2, the proline pattern is not conserved, and when present, proline may be located at position 2.58, 2.59, or 2.60. Sequence analysis, three-dimensional data...

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