2LOW image
Deposition Date 2012-01-27
Release Date 2013-01-16
Last Version Date 2024-05-15
Entry Detail
PDB ID:
2LOW
Title:
Solution structure of AR55 in 50% HFIP
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
40
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Apelin receptor
Gene (Uniprot):APLNR
Chain IDs:A
Chain Length:64
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Preserved Transmembrane Segment Topology, Structure, and Dynamics in Disparate Micellar Environments.
J Phys Chem Lett 8 2381 2386 (2017)
PMID: 28492329 DOI: 10.1021/acs.jpclett.7b00867

Abstact

Detergent micelles are frequently employed as membrane mimetics for solution-state membrane protein nuclear magnetic resonance spectroscopy. Here we compare topology, structure, ps-ns time-scale dynamics, and hydrodynamics of a model protein with one transmembrane (TM) segment (residues 1-55 of the apelin receptor, APJ, a G-protein-coupled receptor) in three distinct, commonly used micellar environments. In each environment, two solvent-protected helical segments connected by a solvent-exposed kink were observed. The break in helical character at the kink was maintained in a helix-stabilizing fluorinated alcohol environment, implying that this structural feature is inherent. Molecular dynamics simulations also substantiate favorable self-assembly of compact protein-micelle complexes with a more dynamic, solvent-exposed kink. Despite the observed similarity in TM segment behavior, micelle-dependent differences were clear in the structure, dynamics, and compactness of the 30-residue, extramembrane N-terminal tail of the protein. This would affect intermolecular interactions and, correspondingly, the functional state of the membrane protein.

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