Biochemical characterization of the carotenoid 1,2-hydratases (CrtC) from Rubrivivax gelatinosus and Thiocapsa roseopersicina.

ABSTRACT: Two carotenoid 1,2-hydratase (CrtC) genes from the photosynthetic bacteria Rubrivivax gelatinosus and Thiocapsa roseopersicina were cloned and expressed in Escherichia coli in an active form and purified by affinity chromatography. The biochemical properties of the recombinant enzymes and their substrate specificities were studied. The purified CrtCs catalyze cofactor independently the conversion of lycopene to 1-HO- and 1,1'-(HO)(2)-lycopene. The optimal pH and temperature for hydratase activity was 8.0 and 30°C, respectively. The apparent K (m) and V (max) values obtained for the hydration of lycopene were 24 μM and 0.31 nmol h(-1) mg(-1) for RgCrtC and 9.5 μM and 0.15 nmol h(-1) mg(-1) for TrCrtC, respectively. Sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis revealed

SUBMITTER: Hiseni A 

PROVIDER: S-EPMC3145076 | biostudies-literature | 2011 Aug

REPOSITORIES: biostudies-literature