Sequential assignment of 1H, 13C and 15N resonances of human carbonic anhydrase I by triple-resonance NMR techniques and extensive amino acid-specific 15N-labeling |
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Authors: | Ingmar Sethson Ulf Edlund Tadeusz A Holak Alfred Ross Bengt-Harald Jonsson |
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Institution: | (1) Department of Organic Chemistry, Umeå University, S-901 87 Umeå, Sweden;(2) Max-Planck Institut für Biochemie, Am Klopferspitz 18 A, D-82152 Martinsried bei München, Germany;(3) Department of Biochemistry, Umeå University, S-901 87 Umeå, Sweden |
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Abstract: | Summary The backbone NMR resonances of human carbonic anhydase I (HCA I) have been assigned. This protein is one of the largest monomeric proteins assigned so far. The assignment was enabled by a combination of 3D triple-resonance experiments and extensive use of amino acid-specific 15N-labeling. The obtained resonance assignment has been used to evaluate the secondary structure elements present in solution. The solution structure appears to be very similar to the crystal structure, although some differences can be observed. Proton-deuteron exchange experiments have shown that the assignments provide probes that can be used in future folding studies of HCA I.The chemical shift data have been deposited in the BioMagResBank in Madison, WI, U.S.A. |
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Keywords: | Triple-resonance spectroscopy NMR resonance assignment Secondary structure Amino acid-specific labeling Amide proton exchange |
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