Proton NMR studies of .lambda. cro repressor. 1. Selective optimization of two-dimensional relayed coherence transfer spectroscopy
- 1 August 1985
- journal article
- research article
- Published by American Chemical Society (ACS) in Biochemistry
- Vol. 24 (17), 4549-4552
- https://doi.org/10.1021/bi00338a010
Abstract
Two-dimensional relayed coherence transfer NMR spectroscopy (RELAY) has been used to corroborate side chain spin system identities in crowded regions of the 1H NMR spectrum of the .lambda. cro repressor protein. The mixing time in the RELAY experiments was optimized for specific preselected spin systems by using recently developed methods [Bax, A., and Drobny, G. (1985) J. Magn. Reson, 61, 306-320], which utilize the transverse relaxation time (T2) of the molecule and relevant J couplings for the defined spin system. We demonstrate that a mixing time of 26 ms gives rise to strong C.alpha.H-C.gamma.H3 RELAY cross peaks for all valine, threonine, and isoleucine residues, while RELAY cross peaks for other spin systems are weak or are not observed. This allows for rapid and unambiguous identification of the side chain resonances for valine, isoleucine, threonine, and alanine (by elimination). The use of optimized RELAY for analyzing and identifying spin systems in complex spectra is discussed.This publication has 9 references indexed in Scilit:
- Proton NMR studies of .lambda. cro repressor. 2. Sequential resonance assignments of the proton NMR spectrumBiochemistry, 1985
- Calibration of the angular dependence of the amide proton-Cα proton coupling constants, 3JHNα, in a globular proteinJournal of Molecular Biology, 1984
- Sequence-specific recognition of DNAJournal of Molecular Biology, 1984
- Sequence‐specific resonance assignments in the 1H nuclear‐magnetic‐resonance spectrum of the Lac repressor DNA‐binding domain 1–51 from Escherichia coli by two‐dimensional spectroscopyEuropean Journal of Biochemistry, 1983
- The molecular basis of DNA–protein recognition inferred from the structure of cro repressorNature, 1982
- Homology among DNA-binding proteins suggests use of a conserved super-secondary structureNature, 1982
- Sequential resonance assignments in protein 1H nuclear magnetic resonance spectraJournal of Molecular Biology, 1982
- 1H‐nmr parameters of the common amino acid residues measured in aqueous solutions of the linear tetrapeptides H‐Gly‐Gly‐X‐L‐Ala‐OHBiopolymers, 1979
- Analysis of the 1H‐NMR spectra of ferrichrome peptides. I. The non‐amide protonsBiopolymers, 1978