Chemically Denatured Structures of Porcine Pepsin using Small-Angle X-ray Scattering.

ABSTRACT: Porcine pepsin is a gastric aspartic proteinase that reportedly plays a pivotal role in the digestive process of many vertebrates. We have investigated the three-dimensional (3D) structure and conformational transition of porcine pepsin in solution over a wide range of denaturant urea concentrations (0-10 M) using Raman spectroscopy and small-angle X-ray scattering. Furthermore, 3D GASBOR ab initio structural models, which provide an adequate conformational description of pepsin under varying denatured conditions, were successfully constructed. It was shown that pepsin molecules retain native conformation at 0-5 M urea, undergo partial denaturation at 6 M urea, and display a strongly unfolded conformation at 7-10 M urea. According to the resulting GASBOR solution models, we identified an i

SUBMITTER: Rho Y 

PROVIDER: S-EPMC6961028 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature