PubMed Health⌕ Search

PubMed · 10969872

A general 13C NMR spectrum predictor using data mining techniques.

Abstract

A general-case neural network model for 13C NMR spectrum prediction (estimation) was built from more than 8,300 carbon atoms having various environments. Building the model from the data set required a few weeks' work using commercial software. Average deviation on test data is ca. 4 ppm. There is no limit on molecule complexity. Estimation error does not depend on molecule size or complexity. The emphasis is on the data, the method and the results, not on the processes that take place inside the modelling software. Advantages, disadvantages and peculiarities of neural network-based data modelling ("data mining") are described at length. The differences in data handling between the data mining approach and traditional statistical modelling techniques are discussed and illustrated in detail. The spectrum predictor is available from PMSI at no charge.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

C Le Bret. 2000. A general 13C NMR spectrum predictor using data mining techniques.. https://doi.org/10.1080/10629360008033232

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Selective inhibition of Src SH2 by a novel thiol-targeting tricarbonyl-modified inhibitor and mechanistic analysis by (1)H/(13)C NMR spectroscopy.

Detailed analysis of Src SH2 binding by peptides containing a novel tricarbonyl-modified pTyr moiety is described. We envisaged that Src SH2 selectivity might be obtained by exploiting the thiol group of Cys188 present in the pTyr binding pocket of the protein at the betaC3 position. Peptidyl as well as non-peptidyl compounds 1-4 possessing a 4-alpha,beta-diketoester-modified pTyr mimic exhibited micromolar affinity to Src SH2. Furthermore, these tricarbonyl compounds were selective for Src SH2 to the extent they showed no significant affinity for either Cys188Ser or Cys188Ala Src SH2 mutants. Upon closer examination of the binding of these tricarbonyls to Src SH2 using NMR of 13C-labeled compounds (6a, 6b, and 6c), we found that after the initial binding event the molecule disproportionated in a 'retro-Claisen' fashion to provide benzoic acid 16 and, following hydrolysis of the methyl ester 17, the hemiketal adduct of glyoxalic acid 18.

Carbon Isotopes↗

An optimized PCR-based procedure for production of 13C/15N-labeled DNA.

We have substantially improved a procedure that we previously described for producing 13C/15N-labeled DNA (Chen et al., FEBS Lett. 436, 372-376, 1998) to provide an economical and straightforward approach to the preparation of labeled DNA. The conditions for the PCR reactions have been optimized to permit the use of low concentrations of the costly labeled dNTPs (50 microM for each). In addition, a rapid and high-yield purification procedure has been developed that allows us to obtain a high yield of very pure labeled DNA. These modifications to our original procedure permit us to obtain 1.9 mg of an 18 bp DNA oligomer from 20 mg of dNTPs (ca. 10% yield from the starting dNTPs). This is sufficient material for the preparation of 0.4 mM sample in a volume of 400 microl. In summary, this procedure is a cost-effective, time-efficient procedure for the production of labeled DNA for NMR studies.

Carbon Isotopes↗