NDLI: Design, synthesis, and characterization of a photoactivatable flavocytochrome molecular maquette.

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Design, synthesis, and characterization of a photoactivatable flavocytochrome molecular maquette.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Moser, C. C. Rabanal, F. Dutton, P. L. Sharp, R. E.
Description	Author Affiliation: Sharp RE ( Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pa 19104, USA.);
Abstract	We report the construction of a synthetic flavo-heme protein that incorporates two major physiological activities of flavoproteins: light activation of flavin analogous to DNA photolyase and rapid intramolecular electron transfer between the flavin and heme cofactors as in several oxidoreductases. The functional tetra-alpha-helix protein comprises two 62-aa helix-loop-helix subunits. Each subunit contains a single cysteine to which flavin (7-acetyl-10-methylisoalloxazine) is covalently attached and two histidines appropriately positioned for bis-his coordination of heme cofactors. Both flavins and hemes are situated within the hydrophobic core of the protein. Intramolecular electron transfer from flavosemiquinone generated by photoreduction from a sacrificial electron donor in solution was examined between protoporphyrin IX and 1-methyl-2-oxomesoheme XIII. Laser pulse-activated electron transfer from flavin to meso heme occurs on a 100-ns time scale, with a favorable free energy of approximately -100 meV. Electron transfer from flavin to the lower potential protoporphyrin IX, with an unfavorable free energy, can be induced after a lag phase under continuous light illumination. Thus, the supporting peptide matrix provides an excellent framework for the positioning of closely juxtaposed redox groups capable of facilitating intramolecular electron transfer and begins to clarify in a simplified and malleable system the natural engineering of flavoproteins.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	18
Volume Number	95
Language	English
Publisher	National Academy of Sciences
Publisher Date	1998-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Flavoproteins Chemistry Recombinant Proteins Amino Acid Sequence Electron Transport Enzyme Activation Chemical Synthesis Metabolism Helix-Loop-Helix Motifs Molecular Sequence Data Photochemistry Potentiometry Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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