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  • Title: A molecular magnet confined in the nanocage of a globular protein.
    Author: Mitra RK, Verma PK, Wulferding D, Menzel D, Mitra T, Todea AM, Lemmens P, Müller A, Pal SK.
    Journal: Chemphyschem; 2010 Feb 01; 11(2):389-93. PubMed ID: 20024976.
    Abstract:
    The effect of confinement and energy transfer on the dynamics of a molecular magnet, known as a model system to study quantum coherence, is investigated. For this purpose the well-known polyoxovanadate [V(15)As(6)O(42)(H(2)O)](6-) (V(15)) is incorporated into a protein (human serum albumin, HSA) cavity. Due to a huge overlap of the optical absorption spectrum of V(15) with the emission spectrum of a fluorescence center of HSA (containing a single tryptophan residue), energy transfer is induced and probed by steady-state and time-resolved fluorescence. The geometrical coordination and the distance of the confined V(15) to the tryptophan moiety of HSA are investigated at various temperatures. This effect is used as a local probe for the thermal denaturation of the protein at elevated temperatures.
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