Escherichia coli O157:H7 is a very common food borne pathogen. Without the detection at the right time, it could turn fatal.
It is not only diagnosis that is important, but also the trials to make it non-virulent are also important. Detection of this in
humans is also important, since appropriate therapy can be administered. Here we demonstrate a system appropriate for E. coli
O157:H7 that can be extended to other bacteria and viruses such as HIV, MRSA detection. The gene fliH, in E. coli O157:H7,
which is one of the major genes that produce the protein necessary for the association of the flagella, was targeted here.
A recombinant protein (for fliH) that tagged with GFP protein was produced using the plasmid. Green fluorescent protein
(GFP) obtained from GFP gene is known for its fluorescence. This makes it very useful in molecular biology to detect the target
gene when it is tagged to GFP. The fliH gene, which plays an important role in flagellar association in the bacteria, was used
here. This when tagged with GFP is an important diagnostic tool for detecting the presence of E. coli O157:H7 in the samples.
For preparing this system, E. coli O157:H7 DNA was isolated and restriction digested and by using other techniques, the fliH
gene was introduced into the pGLO plasmid. This plasmid was expressed to produce the fusion protein ?fliglo?. The isolated fliglo
fusion protein has different spectral signature than the original GFP. GFP shows an emission peak at 509 nm, where as the fusion
protein shows it at 461 nm. This is useful in isolation of pure fusion protein. The fliglo protein will be used in detection assay to
be developed by Nano Science Diagnostics, Inc. for their NanoFluro Device for the detections of E. coli O157:H7. Further the
fusion protein system will be utilized for other bacteria and virus detection in blood samples and also the production of highly
specific antibodies for medical uses.
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