Evaluation of coumarin-based fluorogenic P450 BM3 substrates and prospects for competitive inhibition screenings
摘要:
Fluorescence-based assays for the cytochrome P450 BM3 monooxygenase from Bacillus megaterium address an attractive biotechnological challenge by facilitating enzyme engineering and the identification of potential substrates of this highly promising biocatalyst. In the current study, we used the scarcity of corresponding screening systems as an opportunity to evaluate a novel and continuous high-throughput assay for this unique enzyme. A set of nine catalytically diverse P450 BM3 variants was constructed and tested toward the native substrate-inspired fluorogenic substrate 12-(4-trifluoromethylcoumarin-7-yloxy)dodecanoic acid. Particularly high enzyme-mediated 0-dealkylation yielding the fluorescent product 7-hydroxy-4-trifluoromethylcoumarin was observed with mutants containing the F87V substitution, with A74G/F87V showing the highest catalytic efficiency (0.458 min(-1) mu M-1). To simplify the assay procedure and show its versatility, different modes of application were successfully demonstrated, including (i) the direct use of NADPH or its oxidized form NADP(+) along with diverse NADPH recycling systems for electron supply, (ii) the use of cell-free lysates and whole-cell preparations as the biocatalyst source, and (iii) its use for competitive inhibition screens to identify or characterize substrates and inhibitors. A detailed comparison with known, fluorescence-based P450 BM3 assays finally emphasizes the relevance of our contribution to the ongoing research. (C) 2014 Elsevier Inc. All rights reserved.
Evaluation of coumarin-based fluorogenic P450 BM3 substrates and prospects for competitive inhibition screenings
摘要:
Fluorescence-based assays for the cytochrome P450 BM3 monooxygenase from Bacillus megaterium address an attractive biotechnological challenge by facilitating enzyme engineering and the identification of potential substrates of this highly promising biocatalyst. In the current study, we used the scarcity of corresponding screening systems as an opportunity to evaluate a novel and continuous high-throughput assay for this unique enzyme. A set of nine catalytically diverse P450 BM3 variants was constructed and tested toward the native substrate-inspired fluorogenic substrate 12-(4-trifluoromethylcoumarin-7-yloxy)dodecanoic acid. Particularly high enzyme-mediated 0-dealkylation yielding the fluorescent product 7-hydroxy-4-trifluoromethylcoumarin was observed with mutants containing the F87V substitution, with A74G/F87V showing the highest catalytic efficiency (0.458 min(-1) mu M-1). To simplify the assay procedure and show its versatility, different modes of application were successfully demonstrated, including (i) the direct use of NADPH or its oxidized form NADP(+) along with diverse NADPH recycling systems for electron supply, (ii) the use of cell-free lysates and whole-cell preparations as the biocatalyst source, and (iii) its use for competitive inhibition screens to identify or characterize substrates and inhibitors. A detailed comparison with known, fluorescence-based P450 BM3 assays finally emphasizes the relevance of our contribution to the ongoing research. (C) 2014 Elsevier Inc. All rights reserved.
VERFAHREN ZUR SELEKTIVEN BINDUNG VON ZELLEN AN EINEN BINDUNGSPARTNER UND ZELLEN UMFASSENDE VORRICHTUNGEN
申请人:Karlsruher Institut für Technologie
公开号:EP3336099A1
公开(公告)日:2018-06-20
Die vorliegende Erfindung betrifft Verfahren zur selektiven Bindung von Zellen an einen Bindungspartner, etwa ein festes Trägermaterial, andere Zellen oder Proteine, Vorrichtungen, welche entsprechende Trägermaterialien mit darauf immobilisierten Zellen umfassen, Zellaggregate und Bindungskomplexe, sowie deren Verwendung als Biokatalysator, Biosensor und/oder Bioreaktor.