期刊
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
卷 8, 期 6, 页码 814-821出版社
SPRINGERNATURE
DOI: 10.1039/b902309g
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资金
- Agence Nationale pour la Recherche
- Centre National pour la Recherche Scientifique
- Universite de Strasbourg
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 modi. cations 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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