More line narrowing in TROSY by decoupling of long-range couplings

Shift correlation and 1J-nc′ coupling constant measurements

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Since the introduction of RDCs in high-resolution NMR studies of macromolecules, there is a growing interest in the development of accurate, and sensitive methods for determining coupling constants. Most methods for extracting these couplings are based on the measurement of the splitting between multiplet components in J-coupled spectra. However, these methods are often unreliable since undesired multiple-bond couplings can considerably broaden the multiplet components and consequently make accurate determination of their position difficult. To demonstrate one approach to this problem, G-BIRD(r) decoupled TROSY sequences are proposed for the measurement of 1JNH and 1JNC′ coupling constants. Resolved or unresolved splittings due to remote protons are removed by a G-BIRD(r) module employed during t1 and as a result, spectra with narrow, well-resolved peaks are obtained from which heteronuclear one-bond couplings can be accurately measured. Moreover, introduction of a spin-state-selective α/β-filter in the TROSY sequence allows the separation of the 1JNC′ doublet components into two subspectra which contain the same number of peaks as the regular TROSY spectrum. The 1JNC′ couplings are obtained from the displacement between the corresponding peaks in the subspectra.

Original languageEnglish
Pages (from-to)184-190
Number of pages7
JournalJournal of Magnetic Resonance
Volume170
Issue number2
DOIs
Publication statusPublished - Oct 2004

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decoupling
shift
Macromolecules
Protons
Nuclear magnetic resonance
fine structure
macromolecules
modules
filters
nuclear magnetic resonance
protons
high resolution

Keywords

  • J
  • J
  • G-BIRD
  • Protein
  • Scalar couplings
  • Spin-state-selective α/β-filter
  • TROSY

ASJC Scopus subject areas

  • Molecular Biology
  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics

Cite this

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title = "More line narrowing in TROSY by decoupling of long-range couplings: Shift correlation and 1J-nc′ coupling constant measurements",
abstract = "Since the introduction of RDCs in high-resolution NMR studies of macromolecules, there is a growing interest in the development of accurate, and sensitive methods for determining coupling constants. Most methods for extracting these couplings are based on the measurement of the splitting between multiplet components in J-coupled spectra. However, these methods are often unreliable since undesired multiple-bond couplings can considerably broaden the multiplet components and consequently make accurate determination of their position difficult. To demonstrate one approach to this problem, G-BIRD(r) decoupled TROSY sequences are proposed for the measurement of 1JNH and 1JNC′ coupling constants. Resolved or unresolved splittings due to remote protons are removed by a G-BIRD(r) module employed during t1 and as a result, spectra with narrow, well-resolved peaks are obtained from which heteronuclear one-bond couplings can be accurately measured. Moreover, introduction of a spin-state-selective α/β-filter in the TROSY sequence allows the separation of the 1JNC′ doublet components into two subspectra which contain the same number of peaks as the regular TROSY spectrum. The 1JNC′ couplings are obtained from the displacement between the corresponding peaks in the subspectra.",
keywords = "J, J, G-BIRD, Protein, Scalar couplings, Spin-state-selective α/β-filter, TROSY",
author = "K. K{\"o}v{\'e}r and G. Batta",
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AU - Kövér, K.

AU - Batta, G.

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AB - Since the introduction of RDCs in high-resolution NMR studies of macromolecules, there is a growing interest in the development of accurate, and sensitive methods for determining coupling constants. Most methods for extracting these couplings are based on the measurement of the splitting between multiplet components in J-coupled spectra. However, these methods are often unreliable since undesired multiple-bond couplings can considerably broaden the multiplet components and consequently make accurate determination of their position difficult. To demonstrate one approach to this problem, G-BIRD(r) decoupled TROSY sequences are proposed for the measurement of 1JNH and 1JNC′ coupling constants. Resolved or unresolved splittings due to remote protons are removed by a G-BIRD(r) module employed during t1 and as a result, spectra with narrow, well-resolved peaks are obtained from which heteronuclear one-bond couplings can be accurately measured. Moreover, introduction of a spin-state-selective α/β-filter in the TROSY sequence allows the separation of the 1JNC′ doublet components into two subspectra which contain the same number of peaks as the regular TROSY spectrum. The 1JNC′ couplings are obtained from the displacement between the corresponding peaks in the subspectra.

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