title: High-resolution solid-state NMR structure of a 17.6 kDa protein.
abstract: The use of pseudocontact shifts arising from paramagnetic metal ions in a microcrystalline protein sample is proposed as a strategy to obtain unambiguous signal assignments in solid-state NMR spectra enabling distance extraction for protein structure calculation. With this strategy, 777 unambiguous (281 sequential, 217 medium-range, and 279 long-range) distance restraints could be obtained from PDSD, DARR, CHHC, and the recently introduced PAR and PAIN-CP solid-state experiments for the cobalt(II)-substituted catalytic domain of matrix metalloproteinase 12 (159 amino acids, 17.6 kDa). The obtained structure is a high resolution one, with backbone rmsd of 1.0 +/- 0.2 A, and is in good agreement with the X-ray structure (rmsd to X-ray 1.3 A). The proposed strategy, which may be generalized for nonmetalloproteins with the use of paramagnetic tags, represents a significant step ahead in protein structure determination using solid-state NMR.
authors.affiliation: Magnetic Resonance Center, CERM, University of Florence, Via L. Sacconi, 6-50019 Sesto Fiorentino, Italy. bertini@cerm.unifi.it
authors.forename: Ivano
authors.initials: I
authors.lastname: Bertini
authors.forename: Anusarka
authors.initials: A
authors.lastname: Bhaumik
authors.forename: Gaël
authors.initials: G
authors.lastname: De Paëpe
authors.forename: Robert G
authors.initials: RG
authors.lastname: Griffin
authors.forename: Moreno
authors.initials: M
authors.lastname: Lelli
authors.forename: Józef R
authors.initials: JR
authors.lastname: Lewandowski
authors.forename: Claudio
authors.initials: C
authors.lastname: Luchinat
mesh_terms: D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D053508:Matrix Metalloproteinase 12 / Q000737:chemistry* / Q000378:metabolism; D008958:Models, Molecular; D011487:Protein Conformation
chemical_list: D053508:Matrix Metalloproteinase 12