摘要:
Systems and methods are provided for producing a protein of interest that is typically not amenable to expression in soluble form in in vitro expression systems. In some aspects, the invention provides methods of synthesizing proteins using in vitro protein synthesis systems that include a scaffold protein such as apolipoprotein or an amphipathic alpha helix containing (“AAHC”) protein, in which higher yields of soluble protein are produced than in the absence of the scaffold protein. The scaffold proteins may be provided in an in vitro protein synthesis system associated with lipid or not associated with lipid. The scaffold protein may be provided as a protein per se or may be encoded by a nucleic acid template and co-expressed with the protein of interest. The invention also provides compositions and kits for synthesis of proteins in soluble form, in which the compositions and kits include cell extracts for protein expression and isolation.
摘要:
Systems and methods are provided for producing a protein of interest that is typically not amenable to expression in soluble form in in vitro expression systems. In some aspects, the invention provides methods of synthesizing proteins using in vitro protein synthesis systems that include a scaffold protein such as apolipoprotein or an amphipathic alpha helix containing (“AAHC”) protein, in which higher yields of soluble protein are produced than in the absence of the scaffold protein. The scaffold proteins may be provided in an in vitro protein synthesis system associated with lipid or not associated with lipid. The scaffold protein may be provided as a protein per se or may be encoded by a nucleic acid template and co-expressed with the protein of interest. The invention also provides compositions and kits for synthesis of proteins in soluble form, in which the compositions and kits include cell extracts for protein expression and isolation.
摘要:
Systems and methods are provided for producing a protein of interest that is typically not amenable to expression in soluble form in in vitro expression systems. In some aspects, the invention provides methods of synthesizing proteins using in vitro protein synthesis systems that include a scaffold protein such as apolipoprotein or an amphipathic alpha helix containing (“AAHC”) protein, in which higher yields of soluble protein are produced than in the absence of the scaffold protein. The scaffold proteins may be provided in an in vitro protein synthesis system associated with lipid or not associated with lipid. The scaffold protein may be provided as a protein per se or may be encoded by a nucleic acid template and co-expressed with the protein of interest. The invention also provides compositions and kits for synthesis of proteins in soluble form, in which the compositions and kits include cell extracts for protein expression and isolation.
摘要:
Provided herein are products and processes for efficiently synthesizing biomolecules in vitro using cell-free extracts derived from mammalian cells and insect cells. In an embodiment, provided is a process for preparing a cell-free extract from insect cells and mammalian cells that efficiently synthesizes post-translationally modified target proteins (e.g., glycosylated target proteins). In some embodiments, a ribonucleic acid is synthesized in vitro that comprises a cap, a 5′ untranslated region comprising an 18S rRNA binding ribonucleotide sequence, and a target ribonucleotide sequence. It has been determined that such ribonucleic acids result in efficient in vitro synthesis of a target protein using cell-free extracts derived from non-rabbit mammalian cells and insect cells.
摘要:
Compositions, methods and kits for in vitro systems for synthesis of biomolecules such as polypeptides, are provided herein. Cell extracts that provide enhanced yields of soluble proteins using in vitro protein synthesis methods are provided. The invention also includes methods for producing high yields of proteins by the addition of a feeding solution that includes amino acids and an energy source to an ongoing in vitro synthesis system. The invention also includes methods of using a high-yield in vitro synthesis system to produce large quantities of proteins with incorporated labeled amino acids for analysis by methods such as by NMR. The invention further includes vectors for enhanced production of proteins from nucleic acid templates using in vitro synthesis systems.
摘要:
The present invention relates to in vitro protein synthesis (IVPS) systems, particularly such systems using suppressor tRNAs and rare codon tRNAs to extend translation of an open reading frame into fusion protein elements, thereby generating fusion proteins in vitro. The invention also provides methods, compositions and kits using the IVPS systems of the invention, and proteins produced using the methods, compositions, kits and IVPS systems of the invention.
摘要:
In vitro protein synthesis systems and methods are provided that produce membrane proteins in soluble form. In some aspects, the invention provides methods of synthesizing proteins using in vitro protein synthesis systems that include an apolipoprotein, in which higher yields of soluble protein are produced than in the absence of the apolipoprotein. Apolipoproteins useful in the present invention include naturally occurring apolipoproteins, as well as sequence variants of wild-type apolipoproteins, and engineered apolipoproteins. The apolipoproteins can be provided in an in vitro protein synthesis system associated with lipid or not associated with lipid. The invention also provides compositions and kits for synthesis of proteins in soluble form, in which the compositions and kits include cell extracts for protein translation and at least one apolipoprotein biomolecule.
摘要:
Compositions and methods that can reduce or eliminate purification and detection difficulties related to SlyD polypeptides are disclosed. The compositions include cells that lack or contain a reduced amount of SlyD, cells that contain SlyD mutated to reduce or eliminate its ability to bind biarsenical reagents; anti-SlyD antibodies, and kits containing the same. The disclosed compositions can be used, e.g., to purify and detect recombinant polypeptides having polyhistidine or polycysteine tags.
摘要:
The present invention provides a method of synthesizing a fluorescently labeled protein in a cell free protein synthesis system, comprising the steps of: (a) incubating a sample of ribosomes obtained from a cell-free extract with plasmid DNA containing a coding sequence for a protein of interest, said sample incubated in a coupled transcription/translation medium together with a aminoacyl tRNA having fluorescent label; (b) partially purifying said fluorescently labeled protein by separating newly synthesized, fluorescently-labeled protein from other fluorescent components within said sample; (c) measuring the amount of protein synthesized; (d) determining fluorescence of newly synthesized protein; and (e) determining the biological activity of the newly synthesized protein.