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학술저널
저자정보
Boudier, Christian (Laboratoire de Biophotonique et Pharmacologie, UMR-CNRS 7213, Faculte de Pharmacie, Universite de Strasbourg) Klymchenko, Andrey S. (Laboratoire de Biophotonique et Pharmacologie, UMR-CNRS 7213, Faculte de Pharmacie, Universite de Strasbourg) Mely, Yves (Laboratoire de Biophotonique et Pharmacologie, UMR-CNRS 7213, Faculte de Pharmacie, Universite de Strasbourg) Follenius-Wund, Anny (Laboratoire de Biophotonique et Pharmacologie, UMR-CNRS 7213, Faculte de Pharmacie, Universite de Strasbourg)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제6호
발행연도
2009.1
수록면
814 - 821 (8page)

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The complex multistep inhibition of proteinases by $alpha_1$-antitrypsin (${\alpha}_1$-AT) was investigated by covalently labeling its unique Cys residue with a ratiometric environment-sensitive fluorescent dye, 6-bromomethyl-2-(2-furanyl)-3-hydroxychromone (BMFC). The binding of BMFC-labeled ${\alpha}_1$-AT with pancreatic elastase led to significant changes in the dual emission of BMFC. The 8 nm blue shift of one of the bands and ca. 65% change in the intensity ratio of the two emission bands suggested an increased exposure of the labeled Cys-232 residue to the bulk water on complex formation. In contrast, the bacterial V8 proteinase-induced cleavage of the reactive center loop of BMFC-labeled ${\alpha}_1$-AT did not generate any significant change in the Cys-232 region. Similar experiments with elastase and ${\alpha}_1$-AT conjugated to the classical environment-sensitive dye, IANBD, confirmed these results but led to much smaller modifications in the emission spectrum. Stopped-flow investigation of the reaction between BMFC-labeled ${\alpha}_1$-AT and elastase showed both a well-described fast and a new slow step of the inhibition process. The latter step is probably associated with the structural reorganization aimed at stabilizing the final complex. These results present a convenient fluorescence ratiometric approach based on the BMFC label for studies of protein conformational changes.

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