Notes: The C--H Stretching Bands of Aliphatic Amines

Wright, J. W.

doi:10.1021/jo01091a619

Cited by 23 publications

(3 citation statements)

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“…The 2854 cm -1 mode is as intense as the 2870 cm -1 mode in PGP purified from native purple membrane (spectrum not shown). The feature near 2844 cm -1 corresponds to symmetric methylene stretching modes (ν s [CH 2 ]) on carbons with OH, SH, or NH 2 functional groups (as, for example, in the phospholipid headgroups as well as in Ser, Gly, and Cys residues in BR) (Wright, 1959;Colthup et al, 1990). The shoulder of the asymmetric methylene stretching modes at 2900 cm -1 is assigned to the C-H stretching vibration involving trisubstituted carbon atoms.…”

Section: Resultsmentioning

confidence: 99%

Lipid-Induced Conformational Changes of an Integral Membrane Protein: An Infrared Spectroscopic Study of the Effects of Triton X-100 Treatment on the Purple Membrane of Halobacterium halobium ET1001

et al. 1996

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Exposure of purple membrane from Halobacterium halobium to sublytic concentrations of Triton X-100 results in significant changes in the bacteriorhodopsin (BR) photocycle (Mukhopadhyay et al., 1994). Infrared spectra of purple membrane samples exposed briefly to Triton indicate that this change in protein function accompanies the preferential release of purple membrane glycolipids and squalenes, an association of Triton with purple membrane, and a perturbation of specific lipid headgroup interactions within the membrane. Specifically, the bilayer alterations induced by Triton entail a disruption of lipid headgroup hydrogen bonding in addition to protein conformational changes involving a loss in beta-turn and alphaII-helical structures in BR. We propose that the purple membrane glycolipids and squalenes are critical for the normal functioning of the BR photocycle and that perturbations of these lipids cause the profound photocycle changes induced by exposure to Triton. Lipid reconstitution studies demonstrated that although several of the infrared spectral parameters characteristic of the structural changes induced by Triton were reversed, the photocycle characteristics of BR in native purple membrane were not regained. The observed changes in the vibrational spectra induced by lipid-mediated bilayer perturbations suggest a useful approach for clarifying structure-function relationships of intrinsic membrane proteins exhibiting transmembrane helices.

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Section: Resultsmentioning

confidence: 99%

Lipid-Induced Conformational Changes of an Integral Membrane Protein: An Infrared Spectroscopic Study of the Effects of Triton X-100 Treatment on the Purple Membrane of Halobacterium halobium ET1001

et al. 1996

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“…The CH 2 or CH 3 groups next to the nitrogen atom in amines are somewhat shifted. The symmetric stretch at 2770e2830 cm À1 is lowered in frequency and intensified and so stands out among other aliphatic bands [72,73]. For the compounds containing N(CH 3 ) 2 group in the aromatic structure, the stretching vibrations of N(CH 3 ) 2 group occur in the region 2790e2810 cm À1 [74].…”

Section: N(ch 3 ) 2 Group Vibrationsmentioning

confidence: 99%

Structure activity studies of an analgesic drug tapentadol hydrochloride by spectroscopic and quantum chemical methods

Arjunan¹,

Santhanam

Marchewka

et al. 2015

Journal of Molecular Structure

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“…Das wassr. Filtrat wird mit CHCI, extrahiert, der Extrakt rnit dem Digerat vereinigt, rnit H,O neutral gewaschen, getrocknet und der Ruckstand chromatographiert (Kieselgel, Toluol/AcOEt 9 : 1): 1,95 g (65 YO) 5-Methoxy-4-nitrofuro[2,3f]chinolin-2,7,9-tricarhons~ure-trime1hylester (8). Schmp.…”

Section: -unclassified

Synthese und Eigenschaften der Furo‐ und Thieno‐Analogen von PQQ‐Triester

Martin

Winkler

1994

Helvetica Chimica Acta

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Synthesis and Characterization of the Fur0 and Thieno Analogues of the Triester of PQQWe report here the synthesis and properties of the furo and thieno analogues of 4,5-dihydro-4,5-dioxo-1 Hpyrrolo[2,3~~quinoline-2,7,9-tricarboxylic acid ( = PQQ), ie. the furo-and thieno[2,3-fJquinoline-4,5-quinone (FQQ and TQQ, resp.) derivatives B and C, obtained as triesters. The triester of PQQ derivative A is much more stable than the triesters of B or C, and only the triester of A shows strong activity in nonenzymatic catalytic oxidations.1. Einleitung. -Die Trisaure A (PQQ, 4,5-Dihydro-4,5-dioxo-l H-pyrrolo[2,3-,flchinolin-2,7,9-tricarbonsaure) ist der organische Redox-Cofactor in sogenannten Chinoproteinen [l]. Im

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Notes: The C--H Stretching Bands of Aliphatic Amines

Cited by 23 publications

References 0 publications

Lipid-Induced Conformational Changes of an Integral Membrane Protein: An Infrared Spectroscopic Study of the Effects of Triton X-100 Treatment on the Purple Membrane of Halobacterium halobium ET1001

Lipid-Induced Conformational Changes of an Integral Membrane Protein: An Infrared Spectroscopic Study of the Effects of Triton X-100 Treatment on the Purple Membrane of Halobacterium halobium ET1001

Structure activity studies of an analgesic drug tapentadol hydrochloride by spectroscopic and quantum chemical methods

Synthese und Eigenschaften der Furo‐ und Thieno‐Analogen von PQQ‐Triester

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