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Default Evidence of oligomerization of bovine insulin in solution given by NMR.

Evidence of oligomerization of bovine insulin in solution given by NMR.

Related Articles Evidence of oligomerization of bovine insulin in solution given by NMR.

Eur Biophys J. 2018 Jun 01;:

Authors: Efimov SV, Zgadzay YO, Tarasova NB, Klochkov VV

Abstract
The protein hormone insulin exists in several forms in nature, and a large number of modified sequences are used in pharmacy. They differ by physicochemical properties and efficiency of biological action. Pancreatic bovine insulin was studied in an acidic solution by nuclear magnetic resonance spectroscopy. [Formula: see text]H and [Formula: see text]C NMR signal assignment of backbone and side chains was made by analysis of a set of 2D spectra obtained on a sample with natural isotope abundance. The presence of certain secondary structure elements was revealed on a qualitative level based on nuclear Overhauser effect spectroscopy, which are similar to those observed in the crystal structure. The C-terminus of the B-chain possessed a remarkable flexibility. The molecule was shown to exist in exchange with oligomers based on its self-diffusion coefficient and correlation time measurements performed at different concentrations. Certain signals in the NOESY and HSQC spectra are consistent with the presence of minor conformers; this is an obstacle in simulating the molecular structure under the conditions used in the experiment.


PMID: 29858914 [PubMed - as supplied by publisher]



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