Florida Report Findings in Escherichia Coli -->
By a News Reporter-Staff News Editor at Biotech Week -- Research findings on Proteobacteria are discussed in a new report. According to news reporting from Gainesville, Florida, by NewsRx journalists, research stated, "Laccases are multicopper oxidases that couple the oxidation of phenolic polymers to the reduction of molecular oxygen. While an archaeal laccase has only recently been described (LccA from the culture broth of Haloferax volcanii), this enzyme appears promising for biotechnology applications based on its robust bilirubin oxidase and laccase activities as well as its ability to withstand prolonged exposure to extreme conditions."
The news correspondents obtained a quote from the research from the University of Florida, "To further optimize LccA productivity and develop an option for LccA purification from whole cells, the encoding gene was modified through deletion of the twin-arginine translocation motif and N-terminal propeptide, and the modified genes were expressed in Escherichia coli. With this approach, LccA was readily purified (overall yield up to 54 %) from the soluble fraction of E. coli as a 74-kDa monomer with syringaldazine oxidizing activity as high as 33 U mg(-1). LccA proteins prepared from H. volcanii culture broth and the soluble fraction of E. coli cells were compared by ICP-AES, EPR, DSC, CD, and UV-Vis spectroscopy and found to have a similar folding pattern with T (m) values and a rich ?-sheet structure analogous to other multicopper oxidases."
According to the news reporters, the research concluded: "However, in contrast to the H. volcanii-purified LccA, which was loaded with copper, copper was not fully incorporated into the type-I Cu center of E. coli purified LccA, thus, providing insight into avenues for further optimization."
For more information on this research see: Enhanced archaeal laccase production in recombinant Escherichia coli by modification of N-terminal propeptide and twin arginine translocation motifs. Journal of Industrial Microbiology & Biotechnology, 2012;39(10):1523-32. Journal of Industrial Microbiology & Biotechnology can be contacted at: Nature Publishing Group, 345 Park Avenue South, New York, NY 10010-1707, USA. (Springer - www.springer.com; Journal of Industrial Microbiology & Biotechnology - www.springerlink.com/content/1367-5435/)
Our news journalists report that additional information may be obtained by contacting S. Uthandi, Dept. of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611-0700, United States. Additional authors for this research include L. Prunetti, I.M. De Vera, G.E. Fanucci, A. Angerhofer and J.A Maupin-Furlow (see also Proteobacteria).
Publisher contact information for the Journal of Industrial Microbiology & Biotechnology is: Nature Publishing Group, 345 Park Avenue South, New York, NY 10010-1707, USA.
Keywords for this news article include: Florida, Laccase, Arginine, Gainesville, United States, Oxidoreductases, Escherichia coli, Basic Amino Acids, Enterobacteriaceae, Diamino Amino Acids, Gammaproteobacteria, Essential Amino Acids, Gram Negative Bacteria, North and Central America.
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