title: [Simplification and optimization of the preparation of Escherichia coli extract for cell-free protein expression].
abstract: Cell-free protein expression system is a new method to express target protein in vitro and has been widely applied to the study of protein structure, protein function and other related fields. Preparation of cell extract is one of the key factors that affect the efficiency of the cell-free system. To improve the efficiency and economical feasibility of cell-free protein synthesis, we discussed the parameters during the preparation of the cell extract. These parameters include centrifugation speed, pre-incubation, and dialysis. We used the green fluorescent protein as the reporter protein, and obtained a simple procedure for the preparation of Escherichia coli cell extract. A simple centrifugation step (12 000 x g, 10 min) followed by a brief incubation was sufficient for the preparation of an active cell extract to support protein expression with higher productivity (209 microg/mL). Compared to the traditional E. coli S30 procedure, the processing time was reduced by 62%, and the productivity was increased by 2.6 times. The new procedure will make the advantage of cell-free technology more obvious, and promote its wider application.
authors.affiliation: Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China.
authors.forename: Xinjuan
authors.initials: X
authors.lastname: Guo
authors.forename: Chunshan
authors.initials: C
authors.lastname: Quan
authors.forename: Pengchao
authors.initials: P
authors.lastname: Zhao
authors.forename: Lina
authors.initials: L
authors.lastname: Wang
authors.forename: Shengdi
authors.initials: S
authors.lastname: Fan
mesh_terms: D002458:Cell Fractionation / Q000379:methods; D002474:Cell-Free System; D004926:Escherichia coli / Q000166:cytology* / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000096:biosynthesis* / Q000737:chemistry / Q000302:isolation & purification; D049452:Green Fluorescent Proteins / Q000378:metabolism
chemical_list: D029968:Escherichia coli Proteins; D049452:Green Fluorescent Proteins