Difference between revisions of "Part:BBa K590087"

Revision as of 00:02, 29 October 2011

KumaMax: Kumamolisin-As_N291D, G319S, D358G, D368H

A mutated Kumamolisin-As enzyme aimed to break down gluten by increased activity with the PQLP peptide, an antigenic epitope in gliadin.

Usage and Biology

This part (KumaMax) was constructed by the [http://2011.igem.org/Team:Washington 2011 University of Washington] iGEM team to break down gluten, the primary cause of Celiac's disease. KumaMax was generated by making rational mutations to the active site of the enzyme, as detailed on our [http://2011.igem.org/Team:Washington/Celiacs/Results our wiki]. To test BBa _K590021, it was inserted into a protein expression vector, pET29b+. KumaMax (Kumamolisin-As_N219D, S354N, D358G, D368H) was then produced and purified as described in the [http://2011.igem.org/Team:Washington/Protocols/50mL_UW 2011 iGEM Team's Small Scale Protein Expression and Purification Protocol]. The purified protein was then tested for activity. For a detailed description of the assay, please see the [http://2011.igem.org/Team:Washington/Protocols/Purified_Enzyme_Assay 2011 UW iGEM Purified Enzyme Assay Protocol]. The resulting data is shown below. We achieved an over 100-fold increase in activity on breaking down PQLP from the wild-type enzyme. This variant enzyme is ultimately 784 times better at breaking down PQLP than SC PEP, the enzyme currently in clinical trials for treating gluten intolerance!

The relative activity plot was produced by measuring the quantity of PQLP peptide cleaved per enzyme per hour. Error bars represent a 95% confidence interval from triplicate data.

Sequence and Features