Mechanismus der Substratselektion durch Adenylat bildende Enzyme:
eBook - PDF

Mechanismus der Substratselektion durch Adenylat bildende Enzyme:

Analyse der 4-Cumarat: CoA-Ligase (4CL) und ausgewÀhlter 4CL-Àhnlicher Enzyme aus Arabidopsis thaliana

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  1. 135 pages
  2. English
  3. PDF
  4. Available on iOS & Android
eBook - PDF

Mechanismus der Substratselektion durch Adenylat bildende Enzyme:

Analyse der 4-Cumarat: CoA-Ligase (4CL) und ausgewÀhlter 4CL-Àhnlicher Enzyme aus Arabidopsis thaliana

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About this book

4-Cumarat: CoA-Ligasen (4CLs) aktivieren CumarsĂ€ure und andere ZimtsĂ€urederivate des Phenylpropanoidstoffwechsels unter Bildung einer charakteristischen Adenylat-Zwischenstufe zu den korrespondierenden CoA-Estern. Durch die enzymkinetische Analyse von heterolog exprimierten Mutanten der Isoform 4CL2 aus Arabidopsis thaliana konnte gezeigt werden, dass die korrekte Bindung der verschiedenen Derivate und damit die SpezifitĂ€t von 4CL durch einen GrĂ¶ĂŸenausschlussmechanismus sowie die allgemeine HydrophobizitĂ€t der Substratbindetasche reguliert wird. Basierend auf den erhaltenen Ergebnissen wurden die potenziellen Substratbindetaschen und damit auch mögliche Substrate einer Gruppe bisher nicht charakterisierter, 4CL-Ă€hnlicher Enzyme (4CLLs) vorhergesagt. Im Rahmen der funktionellen Analyse ausgewĂ€hlter 4CLLs konnte die Aktivierung von JasmonsĂ€ure-Vorstufen durch drei Enzyme nachgewiesen werden. Die SubstratspezifitĂ€t dieser 4CLLs sowie ihre Lokalisation in Peroxisomen lassen auf eine Funktion in der Jasmonat- Biosynthese schließen.

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Information

Year
2005
Print ISBN
9783865376817
eBook ISBN
9783736916814
Edition
1

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