Please use this identifier to cite or link to this item: doi:10.22028/D291-28648
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Title: Characterization and engineering of a carotenoid biosynthesis operon from Bacillus megaterium
Author(s): Hartz, Philip
Milhim, Mohammed
Trenkamp, Sandra
Hannemann, Frank
Language: English
Title: Metabolic engineering
Volume: 49
Startpage: 47
Endpage: 58
Publisher/Platform: Elsevier
Year of Publication: 2018
Publikation type: Journal Article
Abstract: Bacillus megaterium belongs to the group of pigmented bacilli producing carotenoids that ensure self-protection from UV radiation-induced and collateral oxidative damage. Metabolite profiling of strain MS941 revealed the presence of the C30 carotenoids 4,4'-diapophytofluene and 4,4'-diaponeurosporenic acid. A gene function analysis demonstrated the presence of a corresponding C30 carotenoid biosynthetic pathway with pharmaceutical importance. We identified a gene cluster comprising putative genes for a farnesyl diphosphate synthase (IspA), a diapophytoene synthase (CrtM) and three distinct diapophytoene desaturases (CrtN1-3). Intriguingly, crtM was organized in an operon together with two of the identified crtN genes. The individual activities of the encoded enzymes were determined by heterologous expression and product analysis in the non-carotenogenic model organism Escherichia coli. Our experimental data show that the first catalytic steps of C30 carotenoid biosynthesis in B. megaterium share significant similarity to the corresponding biosynthetic pathway of Staphylococcus aureus. The biosynthesis of farnesyl diphosphates and their subsequent condensation to form 4,4'-diapophytoene are catalyzed by the identified IspA and CrtM, respectively. The following desaturation reactions to form 4,4'-diaponeurosporene, however, require the activities of multiple diapophytoene desaturases. A biosynthetic operon was engineered and successfully expressed in an E. coli whole-cell system creating a cell factory for a high-yield production of the C30 carotenoid 4,4'-diaponeurosporene which has promising potential in the treatment of various inflammatory diseases.
DOI of the first publication: 10.1016/j.ymben.2018.07.017
URL of the first publication: https://doi.org/10.1016/j.ymben.2018.07.017
Link to this record: hdl:20.500.11880/27678
http://dx.doi.org/10.22028/D291-28648
ISSN: 1096-7184
1096-7176
Date of registration: 6-Sep-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Biowissenschaften
Collections:UniBib – Die Universitätsbibliographie

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