Construction of a novel Pichia pastoris strain for production of xanthophylls.
AMB Express
; 2(1): 24, 2012 Apr 25.
Article
em En
| MEDLINE
| ID: mdl-22534340
ABSTRACT
In this study, we used the yeast carotenogenic producer Pichia pastoris Pp-EBIL strain, which has been metabolically engineered, by heterologously expressing ß-carotene-pathway enzymes to produce ß-carotene, as a vessel for recombinant astaxanthin expression. For this purpose, we designed new P. pastoris recombinant-strains harboring astaxanthin-encoding genes from carotenogenic microorganism, and thus capable of producing xanthophyllic compounds. We designed and constructed a plasmid (pGAPZA-WZ) containing both the ß-carotene ketolase (crtW) and ß-carotene hydroxylase (crtZ) genes from Agrobacterium aurantiacum, under the control of the GAP promoter and containing an AOX-1 terminator. The plasmid was then integrated into the P. pastoris Pp-EBIL strain genomic DNA, producing clone Pp-EBILWZ. The recombinant P. pastoris (Pp-EBILWZ) cells exhibited a strong reddish carotenoid coloration and were confirmed, by HPLC, to produce not only the previous described carotenoids lycopene and ß-carotene, but also de novo synthesized astaxanthin.
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MEDLINE
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En
Ano de publicação:
2012
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Article