title: [The effect of crystallization of calcium carbonate on the secondary structure of pepsin].
abstract: The effect of crystallization of calcium carbonate on the secondary structure of pepsin was studied by Fourier transform infrared spectroscopy, derivative, deconvolution and curve-fitting techniques in this paper. The result shows that the pure protein is composed of 24.38% alpha-helices, 29.91% beta-sheets, 39.22% beta-turns and 6.49% random structures, and the pepsin in the CaCO3/pepsin solution is composed of 2.09% alpha-helices, 93.304% beta-sheets, 4.60% beta-turns and 0.006% random structures. From these data we can see that the alpha-helices decrease and the beta-turns increase with the formation of the crystal of calcium carbonate. The essence of these changes is discussed in the paper.
authors.affiliation: College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453002, China.
authors.forename: Shu-fa
authors.initials: SF
authors.lastname: Zhu
authors.forename: Jun-ming
authors.initials: JM
authors.lastname: Tang
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Ma
authors.forename: Yu-ming
authors.initials: YM
authors.lastname: Guo
authors.forename: Xiu-ying
authors.initials: XY
authors.lastname: Zhang
authors.forename: Lin
authors.initials: L
authors.lastname: Yang
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry*; D003460:Crystallization; D004347:Drug Interactions; D010434:Pepsin A / Q000737:chemistry*; D017433:Protein Structure, Secondary; D012995:Solubility; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D012996:Solutions; D010434:Pepsin A; D002119:Calcium Carbonate