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- W2569594520 abstract "The role of membrane proteins in cellular mechanism strongly depends on their dynamics, and solid-state magic-angle spinning (MAS) nuclear magnetic resonance (NMR) is a unique method to exhaustively characterize motions of proteins in a lipid environment. Herein, we make use of advances in 1H-detected MAS NMR to describe the dynamics of the membrane domain of the Outer membrane protein A of Klebsiella pneumoniae (KpOmpA). By measuring 1H-15N dipolar-coupling as well as 15N R1 and R1ρ relaxation rates at fast (60 kHz) MAS and high magnetic field (1 GHz), we were able to describe the motions of the residues of the β-barrel as a collective rocking of low amplitude and of hundreds of nanoseconds time scale. Residual local motions at the edges of the strands, underscored by enhanced 15N R1ρ relaxation rates, report on the mobility of the connected loops. In agreement with MAS NMR data, proteolysis experiments performed on the full length KpOmpA as well as on its membrane domain, reconstituted in liposomes or in detergent micelles, revealed in all cases the existence of a unique trypsin cleavage site within the membrane domain (out of 16 potential Lys and Arg sites). This site is located in the extracellular loop L3, showing that it is highly accessible to protein-protein interactions. KpOmpA is involved in cell-cell recognition, for adhesion and immune response mechanisms. The L3 region may therefore play a key role in pathogenicity." @default.
- W2569594520 created "2017-01-13" @default.
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- W2569594520 date "2017-01-20" @default.
- W2569594520 modified "2023-10-01" @default.
- W2569594520 title "Local and Global Dynamics in <i>Klebsiella pneumoniae</i> Outer Membrane Protein a in Lipid Bilayers Probed at Atomic Resolution" @default.
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- W2569594520 doi "https://doi.org/10.1021/jacs.6b11565" @default.
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