Jonghyeon Shin

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Cell-free protein synthesis is becoming a powerful technique to construct and to study complex informational processes in vitro. Engineering synthetic gene circuits in a test tube, however, is seriously limited by the transcription repertoire of modern cell-free systems, composed of only a few bacteriophage regulatory elements. Here, we report the(More)
Ideal cell-free expression systems can theoretically emulate an in vivo cellular environment in a controlled in vitro platform. This is useful for expressing proteins and genetic circuits in a controlled manner as well as for providing a prototyping environment for synthetic biology. To achieve the latter goal, cell-free expression systems that preserve(More)
Computation can be performed in living cells by DNA-encoded circuits that process sensory information and control biological functions. Their construction is time-intensive, requiring manual part assembly and balancing of regulator expression. We describe a design environment, Cello, in which a user writes Verilog code that is automatically transformed into(More)
A complete gene expression reaction is reconstituted in a cell-free system comprising the entire endogenous transcription, translation, as well as mRNA and protein degradation machinery of E. coli. In dissecting the major reaction steps, we derive a coarse-grained enzymatic description of biosynthesis and degradation, from which ten relevant rate constants(More)
BACKGROUND Escherichia coli cell-free expression systems use bacteriophage RNA polymerases, such as T7, to synthesize large amounts of recombinant proteins. These systems are used for many applications in biotechnology, such as proteomics. Recently, informational processes have been reconstituted in vitro with cell-free systems. These synthetic approaches,(More)
BACKGROUND A large amount of recombinant proteins can be synthesized in a few hours with Escherichia coli cell-free expression systems based on bacteriophage transcription. These cytoplasmic extracts are used in many applications that require large-scale protein production such as proteomics and high throughput techniques. In recent years, cell-free systems(More)
Cell-free protein synthesis is becoming a serious alternative to cell-based protein expression. Cell-free systems can deliver large amounts of cytoplasmic recombinant proteins after a few hours of incubation. Recent studies have shown that membrane proteins can be also expressed in cell-free reactions and directly inserted into phospholipid membranes. In(More)
The expression of genes into proteins is a fundamental and ubiquitous biological process. Since the 1960s [1], we have known that cells also harness this machinery to control complex processes and carry out informationprocessing tasks, but we are still far from understanding the details of how these behaviors emerge from the intricate interaction of(More)
The synthesis of living entities in the laboratory is a standing challenge that calls for innovative approaches. Using a cell-free transcription-translation system as a molecular programming platform, we show that the bacteriophage T7, encoded by a 40 kbp DNA program composed of about 60 genes, can be entirely synthesized from its genomic DNA in a test tube(More)
The physical interaction between the cytoskeleton and the cell membrane is essential in defining the morphology of living organisms. In this study, we use a synthetic approach to polymerize bacterial MreB filaments inside phospholipid vesicles. When the proteins MreB and MreC are expressed inside the liposomes, the MreB cytoskeleton structure develops at(More)