Sequential assignment

Two-dimensional NMR spectra of proteins are interpreted by the method of sequential assignment... 

D-TOCSY-NOESY Sequential assignment of the spin systems, identification of nOes... 

Sequential assignments TOCSY-NOESY NOESY-HMQC TOCSY-NOESY HCACO HNCA HNCO HCA(CO)N... 

Figure 4 Sequential assignment of the backbone atoms for the segment Pro-109 to Val-113 of inhibited sfSTR by 4-D HCANNH and 4-D HCA(CO)NNH. Four planes are shown from each spectrum. The assigned backbone atoms are indicated in (A). In (B) the upper four planes in solid lines are from the 4-D HCANNH and the lower four planes in dashed lines are from the 4-D HCA(CO)NNH. The chemical shifts for the four correlated nuclei in each case are shown. The correlations continue for the segment Pro-109 to Pro-129. As Pro lacks a protonated N, this residue serves as a "stop" signal. The correlation of 19 residues with Pro at the N- and C-terminal ends is unique for this segment in the sequence of sfSTR, therefore these backbone atoms are specifically assigned without having to further assign side chain atoms. (From Ref. 5.)...

Lohr F, Riiterjans H. A triple resonance experiment for the sequential assignment of backbone resonances in proteins. J Biomol NMR 1995 6 189-197... 

Monte Carlo/simulated annealing (MC/SA) algorithm for sequential assignment in uniformly 13C, 15N-labeled proteins [137]. The two-dimensional (2D) NCACX and NCOCX spectra measured for the fibril samples of full-length Syrian hamster prion protein (residues 23-231) have been analyzed by the MC/SA protocol, from which it has been concluded that the fibril core is formed primarily in the region of residues 173-224 [54]. 

Sequential assignment based on alpha carbon shifts 262... 

Sequential assignment based on carbonyl carbon shifts 287... 

The magnetization has now been successfully transferred from the HN spin to the intraresidual and sequential 13C spins or alternatively to the interresidue 13C spin either using HNCA-TROSY or HNCO-TROSY schemes, respectively. It is inevitable that the HNCO-TROSY spectrum cannot be used for the sequential assignment alone because it does not bridge two sequential N shifts through common carbonyl carbon frequency. The... 

Although, the MP-HNCA-TROSY experiment alone can yield sequential assignment, it can be also used concomitantly with the HNCA-TROSY experiment. This strategy is explained later, but let us first focus on the coherence transfer efficiency of the MP-HNCA-TROSY experiment. The transfer functions for the antiphase experiment (the efficiency for the in-phase experiment is practically the same) are calculated according to Eqs. (10) and (11) for the intraresidual... 

N,1H]-TROSY - Triple Resonance Spectroscopy for Sequential Assignment 233... 

Once the sequential assignment is complete, the secondary structure of the protein can be determined from the secondary-structure specific chemical shifts of the 13Ca nuclei. Other nuclei, including the 13C/9 and the 13CO, also show characteristic chemical shifts that can be used to identify the secondary structure [55-60]. In addition, the secondary structure can also be assigned with the help of the identified secondary structure-specific sequential NOEs and coupling constants obtained from the HNHA experiment... 

Obtaining good quality NMR spectra of large molecular structures is an essential first step. However, in addition, the assignment of the chemical shifts to individual nuclei is indispensable as a basis for detailed structural studies. Sequential assignment is achieved with triple resonance experiments [28] (chapter 4). In these experiments, magnetization is transferred between 1HN, 15N and 13C, and they are routinely applied with molecular sizes up to about 30 kDa. The use of the [ N HJ-TROSY in triple resonance experi-... 

Distinguishes between different alloys with the same percentages of the two principal alloying elements and consists of a letter sequentially assigned as compositions become standard. 

Scheme 1 Peptide Sequence Sequential NOEs and Observable Through-Bond Couplings Useful for Sequential Assignment of the Peptide...

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