Hydrogen exchange during cell-free incorporation of deuterated amino acids and an approach to its inhibition
Hydrogen exchange during cell-free incorporation of deuterated amino acids and an approach to its inhibition
Abstract Perdeuteration, selective deuteration, and stereo array isotope labeling (SAIL) are valuable strategies for NMR studies of larger proteins and membrane proteins. To minimize scrambling of the label, it is best to use cell-free methods to prepare selectively labeled proteins. However, when proteins are prepared from deuterated amino acids by cell-free translation in H2O, exchange reactions can lead to contamination of 2H sites by 1H from the solvent. Examination of a...
TROSY-selected ZZ-exchange experiment for characterizing slow chemical exchange in large proteins
TROSY-selected ZZ-exchange experiment for characterizing slow chemical exchange in large proteins
Abstract A TROSY-selected ZZ-exchange experiment is described for measuring slow chemical exchange rates by monitoring the TROSY component of 15N longitudinal magnetization. Application of the proposed pulse sequence to the cadherin 8 N-terminal extracelluar domain demonstrates that enhanced sensitivity is obtained, compared to a previously described TROSY-detected ZZ-exchange sequence (Sahu et al. J Am Chem Soc 129: 13232â??13237, 2007), by preserving the TROSY effect during the mixing...
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01-09-2011 12:46 PM
Recent advances in segmental isotope labeling of proteins: NMR applications to large proteins and glycoproteins
Recent advances in segmental isotope labeling of proteins: NMR applications to large proteins and glycoproteins
Abstract In the last 15 years substantial advances have been made to place isotope labels in native and glycosylated proteins for NMR studies and structure determination. Key developments include segmental isotope labeling using Native Chemical Ligation, Expressed Protein Ligation and Protein Trans-Splicing. These advances are pushing the size limit of NMR spectroscopy further making larger proteins accessible for this technique. It is just emerging that segmental isotope...
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01-09-2011 12:46 PM
[NMR paper] A general method for determining the electron self-exchange rates of blue copper prot
A general method for determining the electron self-exchange rates of blue copper proteins by longitudinal NMR relaxation.
Related Articles A general method for determining the electron self-exchange rates of blue copper proteins by longitudinal NMR relaxation.
J Am Chem Soc. 2002 Apr 17;124(15):4093-6
Authors: Jensen MR, Hansen DF, Led JJ
A general NMR method is presented that allows a precise determination of the second-order rate constant, k(ese), for the electron self-exchange in blue copper proteins, from the longitudinal relaxation...
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11-24-2010 08:49 PM
[NMR paper] Determining the structures of large proteins and protein complexes by NMR.
Determining the structures of large proteins and protein complexes by NMR.
Related Articles Determining the structures of large proteins and protein complexes by NMR.
Trends Biotechnol. 1998 Jan;16(1):22-34
Authors: Clore GM, Gronenborn AM
Recent advances in multidimensional NMR methodology to obtain 1H, 15N and 13C resonance assignments, interproton-distance and torsion-angle restraints, and restraints that characterize long-range order have, coupled with new methods of structure refinement, permitted solution structure of proteins in excess...
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11-17-2010 11:06 PM
[NMR paper] NMR strategy for determining Xaa-Pro peptide bond configurations in proteins: mutants
NMR strategy for determining Xaa-Pro peptide bond configurations in proteins: mutants of staphylococcal nuclease with altered configuration at proline-117.
Related Articles NMR strategy for determining Xaa-Pro peptide bond configurations in proteins: mutants of staphylococcal nuclease with altered configuration at proline-117.
Biochemistry. 1993 Nov 9;32(44):11810-8
Authors: Hinck AP, Eberhardt ES, Markley JL
A general approach has been developed for configurational analysis (cis or trans) of Xaa-Pro peptide bonds in proteins. This approach,...
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08-22-2010 03:01 AM
[NMR paper] NMR studies of structure and dynamics of isotope enriched proteins.
NMR studies of structure and dynamics of isotope enriched proteins.
Related Articles NMR studies of structure and dynamics of isotope enriched proteins.
Biopolymers. 1992 Apr;32(4):381-90
Authors: Wagner G, Thanabal V, Stockman BJ, Peng JW, Nirmala NR, Hyberts SG, Goldberg MS, Detlefsen DJ, Clubb RT, Adler M
Structural studies of globular proteins by nmr can be enhanced by the use of isotope enrichment. We have been working with proteins enriched with 15N, and with both 15N and 13C. Due to the isotope enrichment we could assign several large...