[NMR paper] Structure of recombinant human parathyroid hormone in solution using multidimensional

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Structure of recombinant human parathyroid hormone in solution using multidimensional NMR spectroscopy.

Related Articles Structure of recombinant human parathyroid hormone in solution using multidimensional NMR spectroscopy.

Biol Chem Hoppe Seyler. 1996 Mar;377(3):175-86

Authors: Gronwald W, Schomburg D, Harder MP, Mayer H, Paulsen J, Wingender E, Wray V

The solution structure of human parathyroid hormone, in the form of recombinant prolyl-hPTH(1-84), has been investigated by multidimensional NMR spectroscopy under conditions (aqueous trifluoroethanol) which favour the structured-state of the protein. Spin systems were identified from 3D 1H DQF (double-quantum filtered)-COSY and TOCSY spectra and sequence-specific assignments were from 2D 1H phase-sensitive NOESY spectra. Signal overlap was resolved in a 3D-NOESY-TOCSY spectrum and assignments were confirmed with 2D NOESY-15N-HMQC (heteronuclear multiple-quantum coherence) spectra taken of a sample universally labeled with 15N. A satisfactory set of final structures was calculated from the quantitative NOE data using restrained molecular dynamics and energy minimization calculations. The N-terminus is dominated by three, well defined helices between Ser-3 to Asn-10, Ser-17 to Lys-27 and Asp-30 to Leu-37, while the most significant structural features in the C-terminus are a short, less-well defined helix between Asn-57 to Ser-62 and a series of loose turns. These two terminal units are joined by an unstructured mid-region. The molecule shows a tendency towards tertiary structure, defined by a number of long-range NOEs. A detailed RMS deviation analysis allowed the final refined structures to be classified into a limited ensemble of stable conformations that reflect the inherent flexibility of the hormone in solution.

PMID: 8722319 [PubMed - indexed for MEDLINE]



Source: PubMed