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  • 1
    ISSN: 1573-5001
    Keywords: Detergent ; CHAPS ; Calcineurin ; Isotope labeling ; Protein structure determination ; Multidimensional NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary At the concentration needed for NMR, the calcium-saturated form of calcineurin B dissolved in water shows resonance line widths that indicate aggregation of this protein. Although the line width or aggregation state can be influenced to some degree by temperature, pH, and salt concentrations, in the absence of detergent no conditions could be found where the protein behaved as a monomeric unit. In the presence of a 10- to 20-fold molar excess of the zwitterionic detergent 3-[(3-cholamidopropyl)-dimethyl-ammonio]-1-propanesulfonate (CHAPS), resonance line widths were considerably narrower and were compatible with a protein of ∼25 kDa. The presence of the NMR signals of the non-deuterated CHAPS does not interfere with modern isotope-directed NMR studies as the signals from protons not attached to 15N or 13C are removed by isotope filtering and purge pulses.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5001
    Keywords: Multidimensional NMR ; Data processing ; Fourier transformation ; Linear prediction ; Maximum entropy ; UNIX
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The NMRPipe system is a UNIX software environment of processing, graphics, and analysis tools designed to meet current routine and research-oriented multidimensional processing requirements, and to anticipate and accommodate future demands and developments. The system is based on UNIX pipes, which allow programs running simultaneously to exchange streams of data under user control. In an NMRPipe processing scheme, a stream of spectral data flows through a pipeline of processing programs, each of which performs one component of the overall scheme, such as Fourier transformation or linear prediction. Complete multidimensional processing schemes are constructed as simple UNIX shell scripts. The processing modules themselves maintain and exploit accurate records of data sizes, detection modes, and calibration information in all dimensions, so that schemes can be constructed without the need to explicitly define or anticipate data sizes or storage details of real and imaginary channels during processing. The asynchronous pipeline scheme provides other substantial advantages, including high flexibility, favorable processing speeds, choice of both all-in-memory and disk-bound processing, easy adaptation to different data formats, simpler software development and maintenance, and the ability to distribute processing tasks on multi-CPU computers and computer networks.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of biomolecular NMR 3 (1993), S. 715-720 
    ISSN: 1573-5001
    Keywords: Radio-frequency heating ; Line-shape distortion ; Multidimensional NMR ; Temperature ; Decoupling ; Isotropic mixing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Application of radio-frequency power in multidimensional NMR experiments can significantly increase the sample temperature compared to that of the surrounding gas flow. Radio-frequency heating effects become more severe at higher magnetic field strengths and ionic strengths. The effects are particularly noticeable for experiments that utilize 1H and/or 13C isotropic mixing and broadband decoupling. If radio-frequency power is applied during the systematically increasing evolution period t1, the sample temperature can change with t1 and thereby cause line-shape distortions. Such distortions are easily avoided by ensuring that the average radio-frequency power remains constant during the entire experiment.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of biomolecular NMR 6 (1995), S. 335-339 
    ISSN: 1573-5001
    Keywords: Multidimensional NMR ; Line narrowing ; Relaxation ; Multiple quantum coherence ; ROESY ; Protein ; Calmodulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary For methine sites the relaxation rate of 13C-1H two-spin coherence is generally slower than the relaxation rate of the individual 13C and 1H single spin coherences. The slower decay of two-spin coherence can be used to increase the sensitivity and resolution in heteronuclear experiments, particularly those that require correlation of Hα and Cα chemical shifts. To avoid dephasing of the two-spin coherence caused by 1H-1H J-couplings, the 1H spin is locked by the application of a weak rf field, resulting in a spin-locked multiple quantum coherence. For a sample of calcium-free calmodulin, use of the multiple quantum approach yields significant signal enhancement over the conventional constant-time 2D HSQC experiment. The approach is applicable to many multidimensional NMR experiments, as demonstrated for a 3D 13C-separated ROESY CT-HMQC spectrum.
    Type of Medium: Electronic Resource
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