Backbone conformational constraints in a microcrystalline U- 15N-labeled protein by 3D dipolar-shift solid-state NMR spectroscopy

W. Trent Franks, Benjamin J. Wylie, Sara A. Stellfox, Chad M. Rienstra

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Structural studies of uniformly labeled proteins by magic-angle spinning NMR spectroscopy have rapidly matured in recent years. Site-specific chemical shifts of several proteins have been assigned and structures determined from 2D or 3D data sets containing internuclear distance information. Here we demonstrate the application of a complementary technique for constraining protein backbone geometry using a site-resolved 3D dipolar-shift pulse sequence. The dipolar line shapes report on the relative orientations of 1H-15N[i] to 1H-15N[i+1] dipole vectors, constraining the torsion angles φ[i] and ψ[i]. In addition, from the same 3D data set, several 1H-15N[i] to1H-15N[i+2] line shapes are extracted to constrain the torsion angles φ[i], ψ[i], φ[i+1], and ψ[i+1]. We report results for the majority of sites in the 56-residue β1 immunoglobulin binding domain of protein G (GB1), using 3D experiments at 600 MHz 1H frequency. Excellent agreement between the SSNMR results and a new 1.14 Å crystal structure illustrate the general potential of this technique for high-resolution structural refinement of solid proteins.

Original languageEnglish
Pages (from-to)3154-3155
Number of pages2
JournalJournal of the American Chemical Society
Issue number10
StatePublished - Mar 15 2006


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