Optimization of ClpXP activity and protein synthesis in an E. coli extract-based cell-free expression system.
Sci Rep
; 8(1): 3488, 2018 02 22.
Article
in En
| MEDLINE
| ID: mdl-29472573
ABSTRACT
Protein degradation is a fundamental process in all living cells and is essential to remove both damaged proteins and intact proteins that are no longer needed by the cell. We are interested in creating synthetic genetic circuits that function in a cell-free expression system. This will require not only an efficient protein expression platform but also a robust protein degradation system in cell extract. Therefore, we purified and tested the activity of E. coli ClpXP protease in cell-free transcription-translation (TX-TL) systems that used E. coli S30 cell extract. Surprisingly, our studies showed that purified ClpXP added to the TX-TL system has very low proteolytic activity. The low activity of ClpXP was correlated with the rapid consumption of adenosine triphosphate (ATP) in cell extract. We improved the activity of ClpXP in cell extract by adding exogenous ATP and an energy regeneration system. We then established conditions for both protein synthesis, and protein degradation by ClpXP to occur simultaneously in the TX-TL systems. The optimized conditions for ClpXP activity will be useful for creating tunable synthetic genetic circuits and in vitro synthetic biology.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Transcription, Genetic
/
Cell-Free System
/
Escherichia coli Proteins
/
Endopeptidase Clp
/
Escherichia coli
Language:
En
Journal:
Sci Rep
Year:
2018
Document type:
Article
Affiliation country:
United States