Difference between revisions of "Part:BBa K3799057"

Revision as of 14:39, 21 October 2021

Bidirectional AIP-1 sensor

This is an improvement of the existing part BBa_K1022100.

Usage and Biology

This is a high throughput sensing module that can sense the presence of AIP-I molecules. This part consists of a pBAD promoter, an AIP sensor infrastructure (BBa_I746101), an AIP inducible promoter P2 and a GFP reporter.

In the natural system, the signalling Auto-inducing peptide (termed AIP) is made from AgrD, while AgrB, a transmembrane protein that is responsible for the cyclization. AgrC and AgrA, form the two-component system responsible for AIP detection and response relay, respectively. Upon binding to AIP, AgrC, a transmembrane histidine kinase receptor, facilitates the phosphorylation of the transcriptional activator AgrA. The phosphorylated AgrA, in turn, activates gene expression regulated by P2 and P3 promoters. There are four known variants of AIP (AIP I-IV) with different molecular structures and cross-inhibitory activity.

This part has been improved from BBa_K1022100 by flipping the direction of p2 promoter to the opposite direction of pBAD promoter.

In the existing part, we observed a significant increase in GFP expression in samples with zero AIP concentration. Based on this observation, we inferred that this could be due to the leaky gene expression of GFP. We have improved the existing part in such a way that the leaky gene expression reduced significantly.

Design

To solve the leaky gene expression we designed a bidirectional circuit. Using Hi-Fi

Sequence and Features

Functional Parameters