Application of nonlinear sampling schemes to COSY-type spectra

Nonlinear sampling along the t1 dimension is applied to COSY-type spectra. The sine dependence of the time domain signals for the cross peaks is matched by a nonlinear sampling scheme that samples most densely around the maximum of the sine function. Data are processed by maximum entropy reconstruct...

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Bibliographic Details
Published inJournal of biomolecular NMR Vol. 3; no. 5; p. 569
Main Authors Schmieder, P, Stern, A S, Wagner, G, Hoch, J C
Format Journal Article
LanguageEnglish
Published Netherlands 01.09.1993
Subjects
Algorithms
Amino Acid Sequence
Magnetic Resonance Spectroscopy - methods
Mathematics
Models, Theoretical
Molecular Sequence Data
Oligopeptides - chemistry
Peptides, Cyclic - chemistry
Thermodynamics
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Summary:Nonlinear sampling along the t1 dimension is applied to COSY-type spectra. The sine dependence of the time domain signals for the cross peaks is matched by a nonlinear sampling scheme that samples most densely around the maximum of the sine function. Data are processed by maximum entropy reconstruction, using a modified implementation of the 'Cambridge' algorithm of Skilling and Bryan. The procedure is demonstrated for P.E. COSY spectra recorded on a cyclic hexapeptide and on a 126-residue domain of the protein villin. The number of t1 values in the nonlinearly sampled experiments was reduced by a factor of four compared to linear sampling. The sensitivity and resolution of the resulting spectra are comparable to those achieved by conventional methods. The method described can thus significantly reduce the measuring time for COSY-type spectra.
ISSN:0925-2738
DOI:10.1007/BF00174610