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The assignment of nitrogen and oxygen atoms in electron-density maps is very challenging due their similarities.
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The assignment of which nitrogen is alkylated besides sulfur is made for the first time using X-ray analysis of single crystals and 2D NMR which indicated that S-, 2-N-isomers will be preferably formed over the S-, 1-N-isomers.
NQ flips denote the wrong assignment of oxygen and nitrogen atoms in amides.
Comparison of these MS/MS spectra allows immediate assignment of the number of nitrogen and carbon atoms present in each fragment ion.
Spectra from either MS or MIDA-MS/MS allowsis assignmentgnment of the number of nitrogens and carbons comprising the underivatized molecule.
Permute group assignment of samples N times.
An NQ-flip denotes the wrong assignment of the oxygen and nitrogen atoms in the amide groups of asparagine (N) and glutamine (Q).
This assignment of atomic B (non-nitrogen bonded) is also corroborated by the lack of a concurrently emerging N1s component upon cooling, as well as by the disappearance of the 188.1 eV signal upon subsequent air exposure, since atomic boron is known to quickly oxidize in ambient air and desorb as highly volatile boron oxides.
However, the assignment of the His22 imidazole ring nitrogens in the R36S mutant is different from that in P23T, most likely prompted by the limited resolution of this crystal structure, and not correct.
Histidine residues may be flipped by 180° due to wrong assignments of carbon and nitrogen atoms in the imidazole ring.
For assignment of exchangeable protons and their attached nitrogens, the following experiments were collected in H2O: imino and amino-optimized 2D H N HSQC ; G-specific 2D H NC -TOCSY-(C)H NC -TOCSY-ΔIa/N-SLV only); 2D HNN-C HY; 2D H–N CPMG-NOESY (for SLIsbΔIa/SLV and SLIds2/SLV only); 2D Nonly; 3D N-edited NOESY-HSQC and 3D N/C-edited NOESY-HSQC with a mixing time of 150 ms (for SLIds2DSLV only).
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