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A fluorescence double-quenching study of native lipoproteins in an animal model of manganese deficiency

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Abstract

Iodide and acrylamide were applied simultaneously in a doublequenching experiment to compare acrylamide quenching constants for internal and external fluorophores of high-density lipoproteins (HDL1 and HDL2) from manganese-adequate (MnA) and deficient (MnD) rats, free of the electrostatic effects associated with iodide. In MnA HDL1 compared to MnD HDL1, the acrylamide quenching constant for external fluorophores was different (P < 0.1). In MnA HDL2, there were two populations of fluorophores accessible to acrylamide, whereas in MnD HDL2, all fluorophores were accessible to both quenchers. We concluded that there were structural (local environmental) differences, possibly charge-related, around the external fluorophores, and a slightly larger population of buried fluorophores in the MnD HDL1 compared with MnA HDL1. In MnA HDL2, one-third of the fluorophores were accessible to iodide, and all external and internal fluorophores were accessible to acrylamide, whereas in MnD HDL2, all fluorophores were accessible to both quenchers.

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Authors and Affiliations

  1. Department of Food Science and Human Nutrition, University of Maine, 20 Merrill Hall, 04469-5749, Orono, ME

    Paul N. Taylor & Dorothy J. Klimis-Tavantzis

  2. Department of Chemistry, University of Maine, 330 Aubert Hall, Orono, ME

    Howard H. Patterson

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  1. Paul N. Taylor
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  2. Howard H. Patterson
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  3. Dorothy J. Klimis-Tavantzis
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Taylor, P.N., Patterson, H.H. & Klimis-Tavantzis, D.J. A fluorescence double-quenching study of native lipoproteins in an animal model of manganese deficiency. Biol Trace Elem Res 60, 69–80 (1997). https://doi.org/10.1007/BF02783310

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  • DOI: https://doi.org/10.1007/BF02783310

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