# Conformational Signatures of Preassembled and Active Complexes of 5‑HT7 with the Gs Protein

## TL;DR

This study explores the structural differences between inactive and active forms of the 5-HT7 receptor bound to the Gs protein using molecular modeling and simulations.

## Contribution

The paper identifies specific interaction patterns and structural features that distinguish preassembled and active receptor-Gs complexes.

## Key findings

- Key interaction patterns specific to different receptor-Gs complex states were identified.
- Unique structural features distinguishing active, inactive, and preassembled states were pinpointed.

## Abstract

5-Hydroxytryptamine receptor type 7 (5-HT7) receptor
is a G protein-coupled receptor (GPCR) exhibiting noncanonical signaling
properties. It has been shown that 5-HT7 can form stable
inactive preassembled complexes with its cognate Gs protein.
Structural determinants of such complex formation and the distinction
between preassembled and intermediate activated complexes remain unknown.
Here, we use molecular modeling and molecular dynamics simulations
to determine and characterize the binding interface between this receptor
and the Gs protein in both the active and preassembly complexes.
Our results show key interaction patterns specific for the different
states and pinpoint unique structural features distinguishing active,
inactive, and preassembled states of the receptor.