Abstract:
:A whole cell-based optical sensing system for copper was developed based on Saccharomyces cerevisiae cells harboring plasmid pYEX-GFPuv. The basis of this system was the ability of the transcriptional activator protein Ace1 present in S. cerevisiae to control the expression of the reporter protein, GFPuv. When copper ions are present in the sample, the Ace1 protein activates the cup1 promoter located upstream from the gfpuv gene in plasmid pYEX-GFPuv, thus inducing the production of GFPuv. The concentration of copper ions in the sample can then be related to the GFPuv expressed in the yeast. The amount of GFPuv produced in the system was determined by monitoring the fluorescence emitted at 507 nm after excitation at 397 nm. This system can detect copper at concentrations as low as 5 x 10(-7) M, and is selective for copper over a variety of metal ions, with the exception of silver. The applicability of this sensing system to different analytical platforms and in real samples is demonstrated.
journal_name
Biotechnol Bioengjournal_title
Biotechnology and bioengineeringauthors
Shetty RS,Deo SK,Liu Y,Daunert Sdoi
10.1002/bit.20331subject
Has Abstractpub_date
2004-12-05 00:00:00pages
664-70issue
5eissn
0006-3592issn
1097-0290journal_volume
88pub_type
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