Deuterium spin probes of side-chain dynamics in proteins. 1. Measurement of five relaxation rates per deuteron in (13)C-labeled and fractionally (2)H-enriched proteins in solution

• Published in: Journal of the American Chemical Society 2002-06, Vol.124 (22), p.6439-6448
• Main Authors: Millet, Oscar, Muhandiram, D R, Skrynnikov, Nikolai R, Kay, Lewis E
• Format: Article
• Language: English
• Subjects: Bacterial Proteins - chemistry; Binding Sites; Carbon Isotopes; Deuterium; Drosophila Proteins; Immunoglobulins - chemistry; Insect Proteins - chemistry; Models, Molecular; Nuclear Magnetic Resonance, Biomolecular - methods; src Homology Domains
• ISSN: 0002-7863
• DOI: 10.1021/ja012497y

New pulse sequences are presented for the measurement of the relaxation of deuterium double quantum, quadrupolar order, and transverse antiphase magnetization in (13)CH(2)D methyl groups of (15)N-, (13)C-labeled, fractionally deuterated proteins. Together with previously developed experiments for measuring deuterium longitudinal and transverse decay rates [Muhandiram, D. R.; Yamazaki, T.; Sykes, B. D.; Kay, L. E. J. Am. Chem. Soc. 1995, 117, 11536], these schemes allow measurement of the five unique decay constants of a single deuteron, providing an unprecedented opportunity to investigate side-chain dynamics in proteins. All five deuterium relaxation rates have been measured for deuterons in the methyl groups of the B1 immunoglobulin binding domain of peptostreptococcal protein L and the N-terminal SH3 domain from the protein drk. Since values of the spectral density function at only three different frequencies contribute to the five relaxation rates, the self-consistency of the relaxation data is readily established. Very good agreement is obtained between calculated parameters describing the amplitudes and time scales of motion when different subsets of the relaxation data are employed.