Difference between revisions of "Part:BBa K2384011"

Revision as of 13:05, 1 November 2017

mf-Lon <mf>-Lon is endogenous Lon protease based on the Gram-positive M.florum tmRNA system.

Usage and Biology

Exogenous control of protein biosynthesis through transcriptional and translational regulation has been well established, but robust and tunable control of protein degradation in bacteria remains elusive. </br></br> mf-Lon Here we present a synthetic degradation system based on the Gram-positive M.florum tmRNA system that does not rely on host degradation systems and function in a wide range of bacteria.

Figure 1:Schematic of the tunable protein degradation system in which ATc-induced <mf>-Lon expression allows the protease to degrade constitutively expressed GFP in pdt-dependent manner.

Protein degradation in bacteria occurs in part through the transfer-messenger RNA (tmRNA) system, which uses C-terminal fusion of the ssrA peptide to direct proteins to the endogenous ClpXP and ClpAP proteases for rapid degradation in E. coli. Variants of the E. coli ssrA tag (ec-ssrA) are commonly used to modify the degradation rate of attached proteins in both bacteria and eukaryotes, but these tags do not provide inducible control of degradation. Recently developed inducible eukaryotic systems rely on degradation machinery not present in bacteria and bacterial systems such as the one developed by Davis et al. require disruption of the endogenous tmRNA system and are therefore not easily transferred to other organisms. </br></br> Toggle switch control of targeted essential protein degradation. Inclusion of the mf-Lon–specific pdt#1 tag on the specified essential gene causes mf-Lon–mediated degradation of the essential protein upon circuit activation.

Sequence and Features