Cross-polarization magic-angle spinning solid-state NMR spectroscopy has been used to investigate the dependence of (13)C sugar chemical shifts on specific conformational parameters of a variety of ribonucleotides and ribonucleosides. Solid-state NMR is a valuable tool for nucleoside and nucleotide structural studies since it provides the means to acquire spectra that correspond to single confo...

Inter leukinla and interleukin-ip are two polypeptides which share a significant number of inflammatory, immunological and pathological properties (for a review see [1]). Importantly, these dissimilar 17 kDa proteins bind to two classes of interleukin-1 receptors, resulting in the mediation of several immune and inflammatory responses and in the induction of a variety of biological changes in n...

The biosynthesis of maduramicin alpha and beta in a culture of Actinomadura yumaensis has been studied using 13C, 14C and 18O labeled precursors. The alpha component of this recently discovered polyether antibiotic, containing forty-seven carbon atoms in a seven-ring system, is derived from eight acetate, seven propionate and four methionine molecules. The beta component which is missing one me...

Nowadays NMR spectroscopy becomes a powerful tool in chemistry because of the NMR chemical shifts. Hartree–Fock theory and the Gauge-including atomic orbital (GIAO) methods are used in the calculation of 29Si NMR chemical shifts of various silicate species in the silicate solution as initial components for zeolite synthesis both in gas and solution phase. Calculations have been performed at geo...

Pyridoxal 5’.phosphate labeled to the extent of 90%’ with 13C in the 4’ (aldehyde) and 5’ (methylene) positions has been synthesized. 13C NMR spectra of this material and of natural abundance pyridoxal 5’.phosphate are reported, as well as r3C NMR spectra of the Schiff base formed by reaction of pyridoxal 5’.phosphate with n-butylamine, the secondary amine formed by reduction of this Schiff bas...

in this paper, the hydrogen bonding (hb) effects on the nmr chemical shifts of selected atoms in serineand serine-nh2o complexes (from one to ten water molecules) have been investigated with quantummechanical calculations of the 15n and 13c tensors. interaction with water molecules causes importantchanges in geometry and electronic structure of serine.for the compound studied, the most importan...

We report chemical shift assignments of the drug-resistant S31N mutant of M218-60 determined with magic angle spinning (MAS) 3D spectra acquired with a 15N-13C ZF-TEDOR transfer followed by 13C-13C mixing by RFDR. The MAS spectra reveal two sets of resonances, indicating that the tetramer assembles as a dimer of dimers, similar to the wild type channel. The two sets of chemical shifts are shown...