Biochemistry and Pharmacology - Research Publications

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    Copper binding to the Alzheimer's disease amyloid precursor protein
    Kong, GK-W ; Miles, LA ; Crespi, GAN ; Morton, CJ ; Ng, HL ; Barnham, KJ ; McKinstry, WJ ; Cappai, R ; Parker, MW (SPRINGER, 2008-03)
    Alzheimer's disease is the fourth biggest killer in developed countries. Amyloid precursor protein (APP) plays a central role in the development of the disease, through the generation of a peptide called A beta by proteolysis of the precursor protein. APP can function as a metalloprotein and modulate copper transport via its extracellular copper binding domain (CuBD). Copper binding to this domain has been shown to reduce A beta levels and hence a molecular understanding of the interaction between metal and protein could lead to the development of novel therapeutics to treat the disease. We have recently determined the three-dimensional structures of apo and copper bound forms of CuBD. The structures provide a mechanism by which CuBD could readily transfer copper ions to other proteins. Importantly, the lack of significant conformational changes to CuBD on copper binding suggests a model in which copper binding affects the dimerisation state of APP leading to reduction in A beta production. We thus predict that disruption of APP dimers may be a novel therapeutic approach to treat Alzheimer's disease.
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    Transitional changes in the CRP structure lead to the exposure of proinflammatory binding sites
    Braig, D ; Nero, TL ; Koch, H-G ; Kaiser, B ; Wang, X ; Thiele, JR ; Morton, CJ ; Zeller, J ; Kiefer, J ; Potempa, LA ; Mellett, NA ; Miles, LA ; Du, X-J ; Meikle, PJ ; Huber-Lang, M ; Stark, GB ; Parker, MW ; Peter, K ; Eisenhardt, SU (NATURE PUBLISHING GROUP, 2017-01-23)
    C-reactive protein (CRP) concentrations rise in response to tissue injury or infection. Circulating pentameric CRP (pCRP) localizes to damaged tissue where it leads to complement activation and further tissue damage. In-depth knowledge of the pCRP activation mechanism is essential to develop therapeutic strategies to minimize tissue injury. Here we demonstrate that pCRP by binding to cell-derived microvesicles undergoes a structural change without disrupting the pentameric symmetry (pCRP*). pCRP* constitutes the major CRP species in human-inflamed tissue and allows binding of complement factor 1q (C1q) and activation of the classical complement pathway. pCRP*-microvesicle complexes lead to enhanced recruitment of leukocytes to inflamed tissue. A small-molecule inhibitor of pCRP (1,6-bis(phosphocholine)-hexane), which blocks the pCRP-microvesicle interactions, abrogates these proinflammatory effects. Reducing inflammation-mediated tissue injury by therapeutic inhibition might improve the outcome of myocardial infarction, stroke and other inflammatory conditions.