Detailed biosynthetic pathway to decaprenoxanthin diglucoside in Corynebacterium glutamicum and identification of novel intermediates
作者:Philipp Krubasik、Shinichi Takaichi、Takashi Maoka、Miki Kobayashi、Kazumori Masamoto、Gerhard Sandmann
DOI:10.1007/s002030100315
日期:2001.9.1
Carotenogenic mutants of Corynebacterium glutamicum were analyzed for their carotenoid content. Mutant MV10 accumulated the same carotenoids as the wild-type, decaprenoxanthin, decaprenoxanthin monoglucoside, and (2R,6R,2 'R,6 'R)-decaprenoxanthin di-(beta -D)-glucoside, but in three-fold higher amounts. In addition, decaprenoxanthin diglucoside fatty acid esters and the intermediates nonaprene, 2-(3-methyl-2-butenyl)-epsilon,psi -carotene, and sarcinene, 2,2 ' -bis(3-methyl-2-butenyl)-epsilon,epsilon -carotene were identified as minor carotenoids. The pink mutants MV40 and MV60 synthesized only lycopene. From another pink mutant, MV70, novel C-50-carotenoids were isolated. By NMR and mass spectroscopy, nonaflavuxanthin, 2-(4-hydroxy-3-methyl-2-butenyl)-1,16-didehydro-1,2-dihydro-psi,psi -carotene, and flavuxanthin, 2,2 ' -bis(4-hydroxy-3-methyl-2-butenyl)-1,16,1 ' ,16 ' -tetradehydro-1,2,1 ' ,2 ' -tetrahydro-psi,psi -carotene, were identified. The identification of these intermediates revealed the detailed pathway for the formation of decaprenoxanthin derivatives in Corynebacterium glutamicum.