Protonation, amino acid

VDC polymer degradation and, 25 717 2-Alkyl-alcohols. See Guerbet alcohols Alkylalkanolamines, 2 140 Alkylaluminum compounds, 2 285 Alkylaluminum halides, 2 358 Alkylaluminum reagents, in triorganotin preparation, 24 815-816 Alkyl amino acids, protonated, 17 780 Alkylaminomethanols, 12 112 AT-Alkyl amino propionates, 24 148... 

The amino acid protons of Asn resonate apart from the GlcNAc protons. 

H Chemical Shifts" of Structural-reporter Groups of Constituent Monosaccharides, and of Amino Acid Protons for Glyco-asparagines... 

Evaluation of the HH ROESY (c) verifies the amino acid sequence of the cyclopentapeptide lactone ring attached to C-9 of actinocin by means of the NOE induced spatial correlation signals la-belled a d in the formula C. The a- and (3-protons of threonine in both cyclopentapeptide lactone rings are sufficiently separated but close to each other. This applies to the other amino acid protons with the exception of TV-methylvaline, in which proton signals overlap (Table 55.1). Therefore, starting from the a- and [3-protons of threonine 8H = 4.61 and 5.75), the sequence Thr-Vai-Pro-Sar-MeVal attached to C-l of actinocin is similarly verified in the HH ROESY as shown in formula C. The connection Sar-MeVal is established by the spatial correlations d between the 72-protons of sarcosine and the A7-methyl-protons of 7V-methylvaline in both rings (SH = 4.71/2.92 and 4.78/2.89). 

A. The chemical shift of amino acid protons depends on their particular chemical environment. 

Note 1 N-labelled amino-acids, proton spectra, ref. 95. 

Grafton, A. K. Wheeler, R. A. "Amino Acid Protonation States Determine Binding Sites of the Secondary Ubiquinone and its Anion in the Rhodobacter sphaeroides Photosynthetic Reaction Center,"/ Phys. Chem. B1999,103,5380-5387. 

Proton ENDOR is a useful probe of the origin of the EPR signals from organic-based radicals. In a series of cw ENDOR studies including samples with isotopically labeled amino acids, proton ENDOR was used to identify the amino acid radical in cytochrome-c peroxidase (CcP) as a tryptophan species. Similarly, isotopic labeling was used to identify the tyrosyl... 

Rajabi K, Pridgen TD (2008) Structures of aliphatic amino acid proton-bound dimers by infrared multiple photon dissociation spectroscopy in the 700-2000 cm(—1) region. J Phys Chem A 112 23-30... 

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