title: Optimized co-solute paramagnetic relaxation enhancement for the rapid NMR analysis of a highly fibrillogenic peptide.
abstract: Co-solute paramagnetic relaxation enhancement (PRE) is an attractive way to speed up data acquisition in NMR spectroscopy by shortening the T 1 relaxation time of the nucleus of interest and thus the necessary recycle delay. Here, we present the rationale to utilize high-spin iron(III) as the optimal transition metal for this purpose and characterize the properties of its neutral chelate form Fe(DO3A) as a suitable PRE agent. Fe(DO3A) effectively reduces the T 1 values across the entire sequence of the intrinsically disordered protein α-synuclein with negligible impact on line width. The agent is better suited than currently used alternatives, shows no specific interaction with the polypeptide chain and, due to its high relaxivity, is effective at low concentrations and in 'proton-less' NMR experiments. By using Fe(DO3A) we were able to complete the backbone resonance assignment of a highly fibrillogenic peptide from α1-antitrypsin by acquiring the necessary suite of multidimensional NMR datasets in 3 h.
authors.affiliation: Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen, The Netherlands.
authors.forename: Nur Alia
authors.initials: NA
authors.lastname: Oktaviani
authors.forename: Michael W
authors.initials: MW
authors.lastname: Risør
authors.forename: Young-Ho
authors.initials: YH
authors.lastname: Lee
authors.forename: Rik P
authors.initials: RP
authors.lastname: Megens
authors.forename: Djurre H
authors.initials: DH
authors.lastname: de Jong
authors.forename: Renee
authors.initials: R
authors.lastname: Otten
authors.forename: Ruud M
authors.initials: RM
authors.lastname: Scheek
authors.forename: Jan J
authors.initials: JJ
authors.lastname: Enghild
authors.forename: Niels Chr
authors.initials: NC
authors.lastname: Nielsen
authors.forename: Takahisa
authors.initials: T
authors.lastname: Ikegami
authors.forename: Frans A A
authors.initials: FA
authors.lastname: Mulder
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry; D006801:Humans; D008962:Models, Theoretical; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D010455:Peptides / Q000737:chemistry*; D011487:Protein Conformation; D011522:Protons; D012996:Solutions; D051844:alpha-Synuclein / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D010455:Peptides; D011522:Protons; D012996:Solutions; D051844:alpha-Synuclein
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