scholarly journals Solid-State NMR Studies of the Succinate-Acetate Permease from Citrobacter Koseri in Liposomes and Native Nanodiscs

Life ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 908
Author(s):  
Xing-Qi Dong ◽  
Jing-Yu Lin ◽  
Peng-Fei Wang ◽  
Yi Li ◽  
Jian Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Chemical Shift ◽  
Solid State Nmr ◽  
Protein Structures ◽  
Anion Channel ◽  
Transmembrane Domains ◽  
Helical Structures ◽  
Nmr Studies ◽  
Two Samples ◽  
Lipid Environment

The succinate-acetate permease (SatP) is an anion channel with six transmembrane domains. It forms different oligomers, especially hexamers in the detergent as well as in the membrane. Solid-state NMR studies of SatP were carried out successfully on SatP complexes by reconstructing the protein into liposomes or retaining the protein in the native membrane of E. Coli., where it was expressed. The comparison of 13C-13C 2D correlation spectra between the two samples showed great similarity, opening the possibility to further study the acetate transport mechanism of SatP in its native membrane environment. Solid-state NMR studies also revealed small chemical shift differences of SatP in the two different membrane systems, indicating the importance of the lipid environment in determining the membrane protein structures and dynamics. Combining different 2D SSNMR spectra, chemical shift assignments were made on some sites, consistent with the helical structures in the transmembrane domains. In the end, we pointed out the limitation in the sensitivity for membrane proteins with such a size, and also indicated possible ways to overcome it.

scholarly journals Insight into the chromophore of rhodopsin and its Meta-II photointermediate by 19F solid-state NMR and chemical shift tensor calculations

2018 ◽  
Vol 20 (48) ◽  
pp. 30174-30188 ◽  
Author(s):  
Andreas Brinkmann ◽  
Ulrich Sternberg ◽  
Petra H. M. Bovee-Geurts ◽  
Isabelle Fernández Fernández ◽  
Johan Lugtenburg ◽  
...  
Keyword(s):  
Solid State ◽  
Chemical Shift ◽  
Solid State Nmr ◽  
Active State ◽  
Chemical Shift Tensor ◽  
Nmr Studies ◽  
Polarization Theory ◽  
Bond Polarization ◽  
Insight Into

19F solid-state NMR studies together with bond polarization theory chemical shift tensor calculations provide insight into the chromophore of rhodopsin and its active state Meta II.

Prospects for 207Pb solid-state NMR studies of lead tetrel bonds

2017 ◽  
Vol 203 ◽  
pp. 165-186 ◽  
Author(s):  
Scott A. Southern ◽  
Dylan Errulat ◽  
Jamie M. Frost ◽  
Bulat Gabidullin ◽  
David L. Bryce
Keyword(s):  
Solid State ◽  
Chemical Shift ◽  
Solid State Nmr ◽  
Close Contact ◽  
Chemical Shifts ◽  
Magic Angle Spinning ◽  
Molecular Entity ◽  
Magic Angle ◽  
Nmr Studies ◽  
Tetrel Bonds

The feasibility and value of 207Pb solid-state NMR experiments on compounds featuring lead tetrel bonds is explored. Although the definition remains to be formalized, lead tetrel bonds may be qualitatively described as existing when there is evidence of a net attractive interaction between an electrophilic region associated with lead in a molecular entity and a nucleophilic region in another, or the same, molecular entity. Unambiguous identification of lead tetrel bonds can be challenging due to the hypervalent tendency of lead. We report here a series of 207Pb solid-state NMR experiments on five metal–organic frameworks featuring lead coordinated to hydrazone-based ligands. Such frameworks may be held together in part by lead tetrel bonds. The acquisition of 207Pb solid-state NMR spectra for such materials is feasible and is readily accomplished using a combination of magic-angle spinning and Carr–Purcell–Meiboom–Gill methods in moderate to low applied magnetic fields. The lead centres are characterized by 207Pb isotropic chemical shifts ranging from −426 to −2591 ppm and chemical shift tensor spans ranging from 910 to 2681 ppm. Careful inspection of the structures of the compounds and the literature 207Pb NMR data may suggest that a tetrel bond to lead results in chemical shift parameters which are intermediate between those which are characteristic of holodirected and hemidirected lead coordination geometries. Challenges associated with DFT computations of the 207Pb NMR parameters are discussed. In summary, the 207Pb data for the compounds studied herein show a marked response to the presence of non-coordinating electron-rich moieties in close contact with the electrophilic surface of formally hemidirectionally coordinated lead compounds.

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