Improved accuracy in measuring one-bond and two-bond ¹⁵N,¹³C^伪 coupling constants in proteins by double-inphase/antiphase (DIPAP) spectroscopy

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• 作者：Frank L枚hr (1) murph@bpc.uni-frankfurt.de
  Sina Reckel (1)
  Susanne Stefer (1)
  Volker D枚tsch (1)
  J眉rgen M. Schmidt (2) j.m.schmidt@kent.ac.uk
• 关键词：Correlation &#8211 ; Fourier transform &#8211 ; Heteronuclear coupling constant &#8211 ; Multiplet simulation &#8211 ; Protein structure &#8211 ; Spin ; state editing &#8211 ; Ubiquitin &#8211 ; Ribonuclease T1 &#8211 ; Xylanase &#8211 ; Get2 domain &#8211 ; Proteorh
• 刊名：Journal of Biomolecular NMR
• 出版时间：June 2011
• 出版年：2011
• 期刊代码：76_09252738
• 类别：bio
• 卷：50
• 期：2
• 页码：167-190
• 数据来源：sp

摘要

An extension to HN(CO-α/β-N,Cα-J)-TROSY (Permi and Annila in J Biomol NMR 16:221–227, 2000) is proposed that permits the simultaneous determination of the four coupling constants 1 J _{N′(i)Cα(i)}, 2 J _HN(i)Cα(i), 2 J _{Cα(i−1)N′(i)}, and 3 J _{Cα(i−1)HN(i)} in 15N,13C-labeled proteins. Contrasting the original scheme, in which two separate subspectra exhibit the 2 J _CαN′ coupling as inphase and antiphase splitting (IPAP), we here record four subspectra that exhibit all combinations of inphase and antiphase splittings possible with respect to both 2 J _CαN′ and 1 J _N′Cα (DIPAP). Complementary sign patterns in the different spectrum constituents overdetermine the coupling constants which can thus be extracted at higher accuracy than is possible with the original experiment. Fully exploiting data redundance, simultaneous 2D lineshape fitting of the E.COSY multiplet tilts in all four subspectra provides all coupling constants at ultimate precision. Cross-correlation and differential-relaxation effects were taken into account in the evaluation procedure. By applying a four-point Fourier transform, the set of spectra is reversibly interconverted between DIPAP and spin-state representations. Methods are exemplified using proteins of various size.