Differential regulation of taurine biosynthesis in rainbow trout and Japanese flounder

Scientific Reports
Xuan WangHuihui Zhou

Abstract

Animals have varied taurine biosynthesis capability, which was determined by activities of key enzymes including cysteine dioxygenase (CDO) and cysteine sulfinate decarboxylase (CSD). However, whether CDO and CSD are differentially regulated across species remains unexplored. In the present study, we examined the regulations of CDO and CSD in rainbow trout and Japanese flounder, the two fish species with high and low taurine biosynthesis ability respectively. Our results showed that the expression of CDO was lower in rainbow trout but more responsive to cysteine stimulation compared to that in Japanese flounder. On the other hand, both the expression and catalytic efficiency (k(cat)) of CSD were higher in rainbow trout than those of Japanese flounder. A three-residue substrate recognition motif in rainbow trout CSD with sequence of F126/S146/Y148 was identified to be responsible for high k(cat), while that with sequence of F88/N108/F110 in Japanese flounder led to low k(cat), as suggested by site-directed mutagenesis studies. In summary, our results determined new aspects of taurine biosynthesis regulation across species.

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Datasets Mentioned

BETA
AAH70509
AAH24241

Methods Mentioned

BETA
PCR
protein assay

Software Mentioned

Prism
NIH Image
Primer
CODEHOP

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