Biosynthetic 13C labeling of aromatic side chains in proteins for NMR relaxation measurements
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Biosynthetic 13C labeling of aromatic side chains in proteins for NMR relaxation measurements. / Teilum, Kaare; Brath, Ulrika; Lundström, Patrik; Akke, Mikael.
I: Journal of the American Chemical Society, Bind 128, Nr. 8, 2006, s. 2506-7.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Biosynthetic 13C labeling of aromatic side chains in proteins for NMR relaxation measurements
AU - Teilum, Kaare
AU - Brath, Ulrika
AU - Lundström, Patrik
AU - Akke, Mikael
N1 - Keywords: Acyl Coenzyme A; Amino Acids, Aromatic; Animals; Calmodulin; Carbon Isotopes; Cattle; Escherichia coli; Glucose; Isotope Labeling; Nuclear Magnetic Resonance, Biomolecular; Phenylalanine; Protein Structure, Tertiary
PY - 2006
Y1 - 2006
N2 - Site-specific 13C labeling offers a desirable means of eliminating unwanted relaxation pathways and coherent magnetization transfer in NMR relaxation experiments. Here we use [1-13C]-glucose as the sole carbon source in the growth media for protein overexpression in Escherichia coli. The approach results in specific incorporation of 13C at isolated positions in the side chains of aromatic amino acids, which greatly simplifies the measurements and interpretation of 13C relaxation rates in these spin systems. The method is well suited for characterization of chemical exchange by CPMG or spin-lock relaxation methods. We validated the method by acquiring 13C rotating-frame relaxation dispersion data on the E140Q mutant of the C-terminal domain of calmodulin, which reveal conformational exchange dynamics with a time constant of 71 mus for Y138.
AB - Site-specific 13C labeling offers a desirable means of eliminating unwanted relaxation pathways and coherent magnetization transfer in NMR relaxation experiments. Here we use [1-13C]-glucose as the sole carbon source in the growth media for protein overexpression in Escherichia coli. The approach results in specific incorporation of 13C at isolated positions in the side chains of aromatic amino acids, which greatly simplifies the measurements and interpretation of 13C relaxation rates in these spin systems. The method is well suited for characterization of chemical exchange by CPMG or spin-lock relaxation methods. We validated the method by acquiring 13C rotating-frame relaxation dispersion data on the E140Q mutant of the C-terminal domain of calmodulin, which reveal conformational exchange dynamics with a time constant of 71 mus for Y138.
U2 - 10.1021/ja055660o
DO - 10.1021/ja055660o
M3 - Journal article
C2 - 16492013
VL - 128
SP - 2506
EP - 2507
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 8
ER -
ID: 15288519