Metal-Ligand Interactions: Molecular, Nano-, Micro-, and by M. Belcastro, S. Chiodo, O. Kondakova, M. Leopoldini

By M. Belcastro, S. Chiodo, O. Kondakova, M. Leopoldini (auth.), Nino Russo, Dennis R. Salahub, Malgorzata Witko (eds.)

In September 2002, a NATO-ASI was once held in Cetraro (CS), Italy at the topic of "Metal-Ligand Interactions in Molecular-, Nano-, Micro-, and Macro-systems in complicated Environments". This occasion has the former ones held within the comparable position in 1991, 1994 and 1998. within the current and the former colleges a large interdisciplinary cross-section of experimental and theoretical researchers, drawn to a greater realizing of metal-ligand interactions from varied viewpoints, used to be associated jointly to switch event, to check the state of the art, to point new suggestions and techniques, to discover new fields and views. specific emphasis was once given to the issues similar with the crossing from molecular platforms to nano-, macro-and micro-scale fabrics and to the consequences of our environment at the houses of the molecular structures. the varsity used to be equipped round lectures and particular examine seminares given through prime specialists within the following fields: • steel clusters • inorganic complexes and fabrics • floor phenomena • adsorption and catalysis • natural and bio-inorganic platforms • ab initio thought • density useful thought • classical and quantum dynamics This quantity includes the formal lectures and chosen contributed papers and describes the most facets and difficulties tackled throughout the 12 days of the event.

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Although copper ions are invariably protein-bound in vivo, binding does not prevent copper from participating in oxygen radical reactions but limits radical formation to the site of copper binding. Importantly, methyl sulfoxide, a known scavenger molecule for 'OH, did not inhibit cleavage. Therefore, it can be assumed that in the case of Prpc, hydroxyl radical formation did not occur in solution, instead oxidation of PrP-copper by H20 2 occurs at the copper binding site. Thus, similar to CU2Zn2S0D in amylotrophyc lateral sclerosis [99] and ~-amyloid precursor protein in Alzheimer's disease [100], Prpc might undergo a copper-dependent cleavage in the presence of H20 2 by following proposed mechanism: Cu2+ (protein bound) +02'- ~ Cu+ (protein bound) + O 2 Cu+ (protein bound) + O 2'- + 2W ~ Cu2+ (protein bound) + H 20 2 Cu+ (protein bound) + H 20 2 ~ Cu2++ 'OH + OIr+ protein fragments +Cu2+ (protein fragments bound) Several factors, such as unbalances in the level of copper(II), decrease of catalase or glutathione peroxidase, increase in H20 2 concentration under conditions of oxidative stress, decrease of pH during situations like inflammation, can not simply modify the antioxidant properties of Prpc .

The C-terminus contains three a-helices and two short [3-strands; interestingly, chemical shift differences suggest that the flexible N-terminus is interacting with residues 187-193 in the helix 2 of PrP(29-231) [20-23]. 1 PHGGGWGOPHGGGWGOPHGGGWGOPHGGGWGQ Figure 1. Sequence of PrP and the octarepeat domain. The word prion has usually been associated to unusual diseases. However, there is also a normal prion protein that not causes disease. Until recently, the highly conserved and widely expressed glycoprotein has been overshadowed by its rogue isoform.

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