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Old 08-22-2010, 05:08 PM
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Default Assessment by 1H NMR spectroscopy of the structural behaviour of human parathyroid-ho

Assessment by 1H NMR spectroscopy of the structural behaviour of human parathyroid-hormone-related protein(1-34) and its close relationship with the N-terminal fragments of human parathyroid hormone in solution.

Related Articles Assessment by 1H NMR spectroscopy of the structural behaviour of human parathyroid-hormone-related protein(1-34) and its close relationship with the N-terminal fragments of human parathyroid hormone in solution.

Biol Chem. 1997 Dec;378(12):1501-8

Authors: Gronwald W, Schomburg D, Tegge W, Wray V

Human parathyroid-hormone-related protein (hPTHrP) is a hormone that is over-expressed by a large number of tumors and is produced by a variety of normal cells. Its main biological functions are shown by the N-terminal fragment (1-34) and are similar to those of parathyroid hormone with which it shares a common G-protein-coupled receptor. Hence to gain insight into the structure-function relationship of these hormones we have investigated the solution structure of hPTHrP(1-34) in pure water alone and have monitored the effect of adding TFE. CD spectra in pure water showed that it only possesses a small content of alpha-helical secondary structure, which from the NMR data, consists of a short unstable helix between Gln-16 and Leu-24 with the rest of the peptide in an essentially unstructured state. On adding 50% TFE (v/v) there was a considerable increase in stable secondary structure, without any evidence of stable tertiary structure. The subsequent structure calculations showed the presence of two well defined helices, from Ser-3 to Gly-12 and from Asp-17 to Thr-33, connected by a flexible linker. The similarity in behaviour of hPTHrP(1-34) and the N-terminal fragments of PTH under various solution conditions is shown from the 1H NMR data presented here and an extensive review of the literature data.

PMID: 9461349 [PubMed - indexed for MEDLINE]



Source: PubMed
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