Dissociation and subunit rearrangement of membrane-bound human C-reactive proteins |
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Authors: | Wang H W Sui S F |
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Institution: | Department of Biological Sciences and Biotechnology, State Key Laboratory of Biomembranes, Tsinghua University, Beijing 100084, China. |
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Abstract: | As one of the most important acute-phase reactants in human serum, C-reactive protein plays its physiological roles mainly on membranes. Here we show that the human C-reactive protein is two-dimensionally crystallized upon specific adsorption on the phosphorylcholine ligand containing membranes by monolayer approach. The 2.0-nm resolution projection structure of the two-dimensional crystals analyzed by electron microscopy and image reconstruction reveals open-ring-like pentamers in the crystals. The electron microscope graphs also show that the dissociated pentamers with open-ring-like structure occur in a closed packing region (not two-dimensionally crystallized). These results indicate a membrane-induced dissociation and rearrangement of hCRP, which may relate to the variety of hCRP's physiological functions. |
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