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© Research
Publication : Nature communications

Structure of outer membrane protein G in lipid bilayers

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature communications - 12 Dec 2017

Retel JS, Nieuwkoop AJ, Hiller M, Higman VA, Barbet-Massin E, Stanek J, Andreas LB, Franks WT, van Rossum BJ, Vinothkumar KR, Handel L, de Palma GG, Bardiaux B, Pintacuda G, Emsley L, Kühlbrandt W, Oschkinat H

Link to Pubmed [PMID] – 29233991

Nat Commun 2017 Dec;8(1):2073

β-barrel proteins mediate nutrient uptake in bacteria and serve vital functions in cell signaling and adhesion. For the 14-strand outer membrane protein G of Escherichia coli, opening and closing is pH-dependent. Different roles of the extracellular loops in this process were proposed, and X-ray and solution NMR studies were divergent. Here, we report the structure of outer membrane protein G investigated in bilayers of E. coli lipid extracts by magic-angle-spinning NMR. In total, 1847 inter-residue 1H-1H and 13C-13C distance restraints, 256 torsion angles, but no hydrogen bond restraints are used to calculate the structure. The length of β-strands is found to vary beyond the membrane boundary, with strands 6-8 being the longest and the extracellular loops 3 and 4 well ordered. The site of barrel closure at strands 1 and 14 is more disordered than most remaining strands, with the flexibility decreasing toward loops 3 and 4. Loop 4 presents a well-defined helix.

https://www.ncbi.nlm.nih.gov/pubmed/29233991