Journal Article

Astaxanthin formation in the marine photosynthetic bacterium <i>Rhodovulum sulfidophilum</i> expressing <i>crtI, crtY, crtW</i> and <i>crtZ</i>

Daikichi Mukoyama, Haruko Takeyama, Yutaka Kondo and Tadashi Matsunaga

in FEMS Microbiology Letters

Volume 265, issue 1, pages 69-75
Published in print December 2006 |
Published online September 2006 | e-ISSN: 1574-6968 | DOI: https://dx.doi.org/10.1111/j.1574-6968.2006.00471.x

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Abstract

This study reports the production of astaxanthin in the photosynthetic bacterium Rhodovulum sulfidophilum, which has adequate precursor pools and storage capabilities for heterologous carotenoid production. Chemical mutagenesis was carried out using ethylmethane sulfonate to produce mutants with a modified carotenoid biosynthesis pathway downstream of phytoene. Stable green- and gray-colored mutants were selected. Green mutants contained neurosporene or chloroxanthin as their major carotenoid (>90%), while the gray mutants accumulated phytoene. We previously demonstrated the production of β-carotene in Rhodovulum sulfidophilum by cloning the Erythrobacter longus crtI (phytoene dehydrogenase) and crtY (lycopene cyclase) genes. In the present study, an expression vector for astaxanthin production was constructed that contained the Paracoccus crtW (β-carotene oxygenase) and crtZ (β-carotene hydroxylase) genes in addition to the E. longus crtI and crtY genes. A transconjugant, which can synthesize astaxanthin, was successfully generated (2.0 µg g−1 DCW).

Keywords: marine photosynthetic bacterium; Rhodovulum sulfidophilum; astaxanthin; carotenoids; metabolic engineering

Journal Article.  3214 words.  Illustrated.

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