Nucleic Acids Research, 1987, Vol. 15, No. 1 267-275
© 1987
Articles |
Assignment of the 13C nuclear magnetic resonance spectrum of a short DNA-duplex with 1H-detected two-dimensional heteronuclear correlation spectroscopy
1Cancer Research Laboratory, University of Auckland School of Medicine Private Bag Auckland, New Zealand Institut für Molekularbiologie und Biophysik, ETH-Hönggerberg CH-8093 Zürich, Switzerland
Received November 4, 1986. Accepted December 1, 1986.
Proton-detected 1H-13C heteronuclear correlated spectroscopy ([1H,13C]-COSY) was used to establish relations between the carbon-13 and proton nuclear magnetic resonance chemical shifts in the hexadeoxynucleoside penta-phosphate d-(GCATGC)2. Using the previously established sequence-specific proton NMR assignments, sequence-specific assignments were thus obtained for nearly all proton-bearing carbons. This approach offers a new criterion for distinguishing between the proton NMR lines of purines and pyrimidines, based on the different proton-carbon-13 coupling constants. Furthermore, the adenine ring carbon 2 has a unique carbon-13 chemical shift, which enables a straightforward identification of the adenine C2H resonances by [1H,13C]-COSY.