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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Homogeneous enzymatic assay for L-cysteine with betaC-S lyase.

We have developed a new enzymatic assay for determining L-cysteine concentration. The method involves the use of betaC-S lyase from Streptococcus anginosus, which catalyzes the alpha,beta-elimination of L-cysteine to hydrogen sulfide, pyruvate, and ammonia. The production of pyruvate is measured by D-lactate dehydrogenase and NADH. The decrease in NADH was proportional to the L-cysteine concentration up to 1.0 mM. When serum samples were used, within-day and day-to-day coefficient variations were below 4%. This method is simple, and can easily and reliably be used for accurate determination of L-cysteine concentration in serum or other samples.[1]

References

  1. Homogeneous enzymatic assay for L-cysteine with betaC-S lyase. Nishiya, Y., Yoshida, Y., Yoshimura, M., Fukamachi, H., Nakano, Y. Biosci. Biotechnol. Biochem. (2005) [Pubmed]
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