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Default 1H, 13C and 15N NMR backbone assignments and secondary structure of the 269-residue p

1H, 13C and 15N NMR backbone assignments and secondary structure of the 269-residue protease subtilisin 309 from Bacillus lentus.

Related Articles 1H, 13C and 15N NMR backbone assignments and secondary structure of the 269-residue protease subtilisin 309 from Bacillus lentus.

J Biomol NMR. 1994 Mar;4(2):257-78

Authors: Remerowski ML, Domke T, Groenewegen A, Pepermans HA, Hilbers CW, van de Ven FJ

1H, 13C and 15N NMR assignments of the backbone atoms of subtilisin 309, secreted by Bacillus lentus, have been made using heteronuclear 3D NMR techniques. With 269 amino acids, this protein is one of the largest proteins to be sequentially assigned by NMR methods to date. Because of the size of the protein, some useful 3D correlation experiments were too insensitive to be used in the procedure. The HNCO, HN(CO)-CA, HNCA and HCACO experiments are robust enough to provide most of the expected correlations for a protein of this size. It was necessary to use several experiments to unambiguously determine a majority of the alpha-protons. Combined use of HCACO, HN(COCA)HA, HN(CA)HA, 15N TOCSY-HMQC and 15N NOESY-HMQC experiments provided the H alpha chemical shifts. Correlations for glycine protons were absent from most of the spectra. A combination of automated and interactive steps was used in the process, similar to that outlined by Ikura et al. [(1990) J. Am. Chem. Soc., 112, 9020-9022] in the seminal paper on heteronuclear backbone assignment. A major impediment to the linking process was the amount of overlap in the C alpha and H alpha frequencies. Ambiguities resulting from this redundancy were solved primarily by assignment of amino acid type, using C alpha chemical shifts and 'TOCSY ladders'. Ninety-four percent of the backbone resonances are reported for this subtilisin. The secondary structure was analyzed using 3D 15N NOESY-HMQC data and C alpha secondary chemical shifts. Comparison with the X-ray structure [Betzel et al. (1992) J. Mol. Biol., 223, 427-445] shows no major differences.

PMID: 8019137 [PubMed - indexed for MEDLINE]



Source: PubMed
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