Ammonium dynamics in Rb1−x(NH4)xSCN mixed crystals at 10 K

Smirnov, L. S.; Natkaniec, I.; Bragin, S.I.; Shuvalov, L. A.; Sulyanov, S. N.

doi:10.1016/s0921-4526(96)00881-2

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…It should also be noted that the calculations produced from the crystal structure selected for the 33 S fits also produced good agreement of calculated parameters for the other NMR active nuclei in the compounds. Specifically, the calculations for 23 Na in Na 2 SO 4 , 39 K in K 2 SO 4 , 87 Rb in Rb 2 SO 4 , 133 Cs in Cs 2 SO 4 , 25 Mg in α-MgSO 4 and β-MgSO 4 , 87 Sr in SrSO 4 , and 69 Ga/ 71 Ga in Ga 2 (SO 4 ) 3 match well with previously reported NMR parameters for these nuclei. 89,[97][98][99][100][101][102][103] Fig.…”

Section: Structural Assessment Via Solid State Nmr and First Principl...supporting

confidence: 86%

“…And, it has been shown that when treated as a single univalent cation, the ionic radius of NH 4 + is in between that of Li + and Rb + . 86,87 Thus, this compound also seems to follow this trend. It is interesting, however, to note that Na 2 SO 4 does not follow this trend and exhibits the least shielded sulfur site of all the alkali metal sulfates (Fig.…”

Section: Structural Correlation Of the Shielding Interactionmentioning

confidence: 61%

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Structural assessment of anhydrous sulfates with high field 33S solid state NMR and first principles calculations

et al. 2013

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Section: Structural Assessment Via Solid State Nmr and First Principl...supporting

confidence: 86%

Section: Structural Correlation Of the Shielding Interactionmentioning

confidence: 61%

Structural assessment of anhydrous sulfates with high field 33S solid state NMR and first principles calculations

et al. 2013

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Features of the structure and dynamics of Me1−x (NH4) x SCN (Me = K, Rb) mixed crystals

Smirnov

Natkaniec

Belushkin

et al. 2009

J. Synch. Investig.

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OmpW of Caulobacter crescentus Functions as an Outer Membrane Channel for Cations

et al. 2015

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Caulobacter crescentus is an oligotrophic bacterium that lives in dilute organic environments such as soil and freshwater. This bacterium represents an interesting model for cellular differentiation and regulation because daughter cells after division have different forms: one is motile while the other is non-motile and can adhere to surfaces. Interestingly, the known genome of C. crescentus does not contain genes predicted to code for outer membrane porins of the OmpF/C general diffusion type present in enteric bacteria or those coding for specific porins selective for classes of substrates. Instead, genes coding for 67 TonB-dependent outer membrane receptors have been identified, suggesting that active transport of specific nutrients may be the norm. Here, we report that high channel-forming activity was observed with crude outer membrane extracts of C. crescentus in lipid bilayer experiments, indicating that the outer membrane of C. crescentus contained an ion-permeable channel with a single-channel conductance of about 120 pS in 1M KCl. The channel-forming protein with an apparent molecular mass of about 20 kDa was purified to homogeneity. Partial protein sequencing of the protein indicated it was a member of the OmpW family of outer membrane proteins from Gram-negative bacteria. This channel was not observed in reconstitution experiments with crude outer membrane extracts of an OmpW deficient C. crescentus mutant. Biophysical analysis of the C. crescentus OmpW suggested that it has features that are special for general diffusion porins of Gram-negative outer membranes because it was not a wide aqueous channel. Furthermore, OmpW of C. crescentus seems to be different to known OmpW porins and has a preference for ions, in particular cations. A putative model for OmpW of C. crescentus was built on the basis of the known 3D-structures of OmpW of Escherichia coli and OprG of Pseudomonas aeruginosa using homology modeling. A comparison of the two known structures with the model of OmpW of C. crescentus suggested that it has a more hydrophilic interior and possibly a larger diameter.

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Ammonium dynamics in Rb1−x(NH4)xSCN mixed crystals at 10 K

Cited by 3 publications

References 2 publications

Structural assessment of anhydrous sulfates with high field 33S solid state NMR and first principles calculations

Structural assessment of anhydrous sulfates with high field 33S solid state NMR and first principles calculations

Features of the structure and dynamics of Me1−x (NH4) x SCN (Me = K, Rb) mixed crystals

OmpW of Caulobacter crescentus Functions as an Outer Membrane Channel for Cations

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