Part:BBa_K118022:Experience

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Characterization

Edinburgh 2011 conducted two assays, comparing the activity of this part (but under the control of the lac promoter, giving BBa_K523016) to a β-glucosidase (E. coli bglX, also under the control of the lac promoter) on two different substrates:

• 4-methylumbelliferyl β- D- glucuronide (MUG, left photo). This substrate is a cellobiose analog.
• 4-methylumbelliferyl β- D- cellobioside (MUC, right photo). This substrate is larger and is more like a cellulose analog.

Both substrates produce a fluorescent product when cleaved. Our plates below show the results of placing cell lysate and cell debris on an MUG plate and an MUC plate. Present on both plates are:

• Left side of plate: lysate/debris from JM109 expressing bglX, BBa_K523014
• Right side of plate: lysate/debris from JM109 expressing cex, BBa_K523016
• Bottom of plate: lysate/debris from JM109 cells

MUG assay. bglX on left, cex on right.		MUC assay. bglX on left, cex on right.

As can be seen, cex is much better at degrading MUC.

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