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J. Bacteriol., 11 1995, 6575-6584, Vol 177, No. 22
N Misawa, Y Satomi, K Kondo, A Yokoyama, S Kajiwara, T Saito, T Ohtani and W Miki
A carotenoid biosynthesis gene cluster for the production of astaxanthin
was isolated from the marine bacterium Agrobacterium aurantiacum. This
cluster contained five carotenogenic genes with the same orientation, which
were designated crtW, crtZ, crtY, crtI, and crtB. The stop codons of
individual crt genes except for crtB overlapped the start codons of the
following crt genes. Escherichia coli transformants carrying the Erwinia
uredovora carotenoid biosynthesis genes provide suitable substrates for
carotenoid biosynthesis. The functions of the five crt genes of A.
aurantiacum were determined through chromatographic and spectroscopic
analyses of the pigments accumulated in some E. coli transformants carrying
various combinations of the E. uredovora and A. aurantiacum carotenogenic
genes. As a result, the astaxanthin biosynthetic pathway is proposed for
the first time at the level of the biosynthesis genes. The crtW and crtZ
gene products, which mediated the oxygenation reactions from beta- carotene
to astaxanthin, were found to have low substrate specificity. This allowed
the production of many presumed intermediates of astaxanthin, i.e.,
adonixanthin, phoenicoxanthin (adonirubin), canthaxanthin,
3'-hydroxyechinenone, and 3-hydroxyechinenone.
Copyright © 1995, American Society for Microbiology
Structure and functional analysis of a marine bacterial carotenoid biosynthesis gene cluster and astaxanthin biosynthetic pathway proposed at the gene level
Central Laboratories for Key Technology, Kirin Brewery Co., Ltd., Kanagawa, Japan.
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