Molecules 2013, 18(8), 8906-8918; doi:10.3390/molecules18088906

NMR Solution Structure of a Chymotrypsin Inhibitor from the Taiwan Cobra Naja naja atra

1 Graduate Institute of Natural Products and Center of Excellence for Environmental Medicine, Kaohsiung Medical University, No.100, Shi-Chuan 1st Road, San-Ming District, Kaohsiung 807, Taiwan 2 Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan 3 Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt am Main, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany 4 Frankfurt Institute for Advanced Studies, Goethe University Frankfurt am Main, Ruth-Moufang- Str. 1, 60438 Frankfurt am Main, Germany 5 Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
* Author to whom correspondence should be addressed.
Received: 14 June 2013; in revised form: 19 July 2013 / Accepted: 22 July 2013 / Published: 26 July 2013
(This article belongs to the Special Issue NMR of Proteins and Small Biomolecules)
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Abstract: The Taiwan cobra (Naja naja atra) chymotrypsin inhibitor (NACI) consists of 57 amino acids and is related to other Kunitz-type inhibitors such as bovine pancreatic trypsin inhibitor (BPTI) and Bungarus fasciatus fraction IX (BF9), another chymotrypsin inhibitor. Here we present the solution structure of NACI. We determined the NMR structure of NACI with a root-mean-square deviation of 0.37 Å for the backbone atoms and 0.73 Å for the heavy atoms on the basis of 1,075 upper distance limits derived from NOE peaks measured in its NOESY spectra. To investigate the structural characteristics of NACI, we compared the three-dimensional structure of NACI with BPTI and BF9. The structure of the NACI protein comprises one 310-helix, one α-helix and one double-stranded antiparallel β-sheet, which is comparable with the secondary structures in BPTI and BF9. The RMSD value between the mean structures is 1.09 Å between NACI and BPTI and 1.27 Å between NACI and BF9. In addition to similar secondary and tertiary structure, NACI might possess similar types of protein conformational fluctuations as reported in BPTI, such as Cys14–Cys38 disulfide bond isomerization, based on line broadening of resonances from residues which are mainly confined to a region around the Cys14–Cys38 disulfide bond.
Keywords: Naja naja atra; snake venom; chymotrypsin inhibitor; NACI; BPTI; NMR spectroscopy; NMR structure determination; disulfide bond isomerization

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MDPI and ACS Style

Lin, Y.-J.; Ikeya, T.; Güntert, P.; Chang, L.-S. NMR Solution Structure of a Chymotrypsin Inhibitor from the Taiwan Cobra Naja naja atra. Molecules 2013, 18, 8906-8918.

AMA Style

Lin Y-J, Ikeya T, Güntert P, Chang L-S. NMR Solution Structure of a Chymotrypsin Inhibitor from the Taiwan Cobra Naja naja atra. Molecules. 2013; 18(8):8906-8918.

Chicago/Turabian Style

Lin, Yi-Jan; Ikeya, Teppei; Güntert, Peter; Chang, Long-Sen. 2013. "NMR Solution Structure of a Chymotrypsin Inhibitor from the Taiwan Cobra Naja naja atra." Molecules 18, no. 8: 8906-8918.

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