Difference between revisions of "Part:BBa K627011"

Revision as of 23:21, 21 September 2011

Fusion part of pBAD arabinose-inducible induction system and the HRV 14_3C protease

Introduction

This BioBrick is a 2 part fusion of arabinose-inducible induction system and the HRV 14_3C protease.

General Information of the single sub parts

HRV 14_3C

The recombinant type 14_3C protease from human rhinovirus (HRV 3C) recognizes the same cleavage site as the native enzyme: LeuGluValLeuPheGln/GlyPro.
The 22 kDa protease got its optimal activity at 4°C but also shows a high cleavage rate at 37°C. The 14_3C works with a catalytic triade, containing the amino acid residues Ser-Asp-His at its active site.

Arabinose-inducible induction system

The arabinose-inducible induction system was amplified via PCR from the pBAD_iGEMexpress vector. Based on the inhibitionary funtion of the catabolic activator protein (CAP) it got a very low expression rate without induction by arabinose. For the induction concentration between 2 mM up to 50 mM arabinose can be used to get an high expression rate.

General Function

When arabinose is added to the media (2mM up to 50 mM), the CAP lost its inhibitory function and the arabinose-inducible induction system gets activated. The protein, here the HRV 14_3C protease, after the T7 RBS gets express at a very high rate. So we can assume that this system is an effectiv protease generator.

Performance and Summary

In combination with our created ssTorA_CS-14_3C_blaFL device (BBa_K627013, More Information) this protease generator was able to mediate the cell death of our transformed E.coli cells at ampicillin concentration up to 100 µg/ml. Sequence and Features