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Autor(en): Wehrmann, Matthias
Billard, Patrick
Martin-Meriadec, Audrey
Zegeye, Asfaw
Klebensberger, Janosch
Titel: Functional role of lanthanides in enzymatic activity and transcriptional regulation of Pyrroloquinoline quinone-dependent alcohol dehydrogenases in Pseudomonas putida KT2440
Erscheinungsdatum: 2017
Dokumentart: Zeitschriftenartikel
Seiten: 14
Erschienen in: mBio 8 (2017), No. 3, e00570-17
ISSN: 2150-7511
Bemerkungen: DFG funding grant: KL 2340/2-1
Zusammenfassung: The oxidation of alcohols and aldehydes is crucial for detoxification and efficient catabolism of various volatile organic compounds (VOCs). Thus, many Gram-negative bacteria have evolved periplasmic oxidation systems based on pyrroloquinoline quinone-dependent alcohol dehydrogenases (PQQ-ADHs) that are often functionally redundant. Here we report the first description and characterization of a lanthanide-dependent PQQ-ADH (PedH) in a nonmethylotrophic bacterium based on the use of purified enzymes from the soil-dwelling model organism Pseudomonas putida KT2440. PedH (PP_2679) exhibits enzyme activity on a range of substrates similar to that of its Ca2+-dependent counterpart PedE (PP_2674), including linear and aromatic primary and secondary alcohols, as well as aldehydes, but only in the presence of lanthanide ions, including La3+, Ce3+, Pr3+, Sm3+, or Nd3+. Reporter assays revealed that PedH not only has a catalytic function but is also involved in the transcriptional regulation of pedE and pedH, most likely acting as a sensory module. Notably, the underlying regulatory network is responsive to as little as 1 to 10 nM lanthanum, a concentration assumed to be of ecological relevance. The present study further demonstrates that the PQQ-dependent oxidation system is crucial for efficient growth with a variety of volatile alcohols. From these results, we conclude that functional redundancy and inverse regulation of PedE and PedH represent an adaptive strategy of P. putida KT2440 to optimize growth with volatile alcohols in response to the availability of different lanthanides.
Enthalten in den Sammlungen:03 Fakultät Chemie

Dateien zu dieser Ressource:
Datei Beschreibung GrößeFormat 
Wehrmann_Klebensberger_2017_mBIO_Lanthanide PedH PedE regulation.pdfArticle1,24 MBAdobe PDFÖffnen/Anzeigen
Supplementary_File_Complete.pdfSupplementary material13,89 MBAdobe PDFÖffnen/Anzeigen

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