Cell-free synthesis and isolation of novel genes and polypeptides
First Claim
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1. A method for producing novel polypeptides, comprising:
- (a) constructing an in vitro expression unit comprising a 5'"'"' untranslated region containing an RNA polymerase binding site, a ribosome binding site, and a translation initiation signal, said expression unit being capable of producing mRNA;
(b) attaching one or more semi-random polynucleotides to said expression unit;
(c) transcribing or replicating from the RNA polymerase binding site the polynucleotides associated with the expression unit and semi-random polynucleotides to produce mRNA;
(d) translating said mRNA to produce polysomes under conditions sufficient to maintain said polysomes;
(e) binding said polysomes to a substance of interest;
(f) isolating said polysomes that bind to said substance of interest;
(g) disrupting said isolated polysomes to release mRNA;
(h) recovering said mRNA;
(i) constructing cDNA from said recovered mRNA; and
(j) expressing said cDNA to produce novel polypeptides.
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Abstract
A method for the cell-free synthesis and isolation of novel genes and polypeptides is provided. Within one embodiment, an expression unit is constructed onto which semi-random nucleotide sequences are attached. The semi-random nucleotide sequences are first transcribed to produce RNA, and then translated under conditions such that polysomes are produced. Polysomes which bind to a substance of interest are then isolated and disrupted; and the released mRNA is recovered. The mRNA is used to construct cDNA which is expressed to produce novel polypeptides.
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Citations
50 Claims
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1. A method for producing novel polypeptides, comprising:
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(a) constructing an in vitro expression unit comprising a 5'"'"' untranslated region containing an RNA polymerase binding site, a ribosome binding site, and a translation initiation signal, said expression unit being capable of producing mRNA; (b) attaching one or more semi-random polynucleotides to said expression unit; (c) transcribing or replicating from the RNA polymerase binding site the polynucleotides associated with the expression unit and semi-random polynucleotides to produce mRNA; (d) translating said mRNA to produce polysomes under conditions sufficient to maintain said polysomes; (e) binding said polysomes to a substance of interest; (f) isolating said polysomes that bind to said substance of interest; (g) disrupting said isolated polysomes to release mRNA; (h) recovering said mRNA; (i) constructing cDNA from said recovered mRNA; and (j) expressing said cDNA to produce novel polypeptides. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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13. A method for producing novel polypeptides, comprising:
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(a) constructing an in vitro expression unit comprising a 5'"'"' untranslated region containing an RNA polymerase binding site, a ribosome binding site, and a translation initiation signal, said expression unit being capable of producing mRNA; (b) attaching one or more semi-random polynucleotides to the expression unit; (c) transcribing from the RNA polymerase binding site the polynucleotides associated with the expression unit and semi-random polynucleotides to produce mRNA; (d) translating said mRNA in vitro to produce biologically active polypeptides; (e) subdividing the mRNA encoding said biologically active polypeptides; (f) transcribing, translating, and subdividing as set forth in steps (c)-(e), such that the gene of interest is isolated; (g) constructing cDNA from said isolated gene; and (h) expressing said cDNA to produce novel polypeptides. - View Dependent Claims (15)
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14. A method for producing novel polypeptides, comprising:
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(a) constructing an in vitro expression unit comprising a 5'"'"' untranslated region containing an RNA polymerase binding site, a ribosome binding site, and a translation initiation signal, said expression unit being capable of producing mRNA; (b) attaching one or more semi-random polynucleotides to the expression unit; (c) replicating from the RNA polymerase binding site the polynucleotides associated with the expression unit and semi-random polynucleotides to produce mRNA; (d) translating said mRNA in vitro to produce biologically active polypeptides; (e) subdividing the mRNA encoding said biologically active polypeptides; (f) translating and subdividing as set forth in steps (d)-(e) such that the gene of interest is isolated; (g) constructing cDNA from said isolated gene; and (h) expressing said cDNA to produce novel polypeptides.
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48. A method for producing novel polypeptides, comprising:
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(a) constructing an in vitro expression unit comprising a 5'"'"' untranslated region containing an RNA polymerase binding site, a ribosome binding site, and a translation initiation signal, said expression unit being capable of producing mRNA; (b) attaching one or more semi-random polynucleotides to said expression unit adjacent to a polynucleotide sequence encoding a fixed amino acid sequence; (c) transcribing or replicating from the RNA polymerase binding site the polynucleotides associated with the expression unit and semi-random polynucleotides to produce mRNA which encodes a polypeptide of at least about fifty amino acids; (d) translating said mRNA to produce polysomes under conditions sufficient to maintain said polysomes; (e) binding said polysomes to a substance of interest; (f) isolating said polysomes that bind to said substance of interest; (g) disrupting said isolated polysomes to release mRNA; (h) recovering said mRNA; (i) constructing cDNA from said recovered mRNA; and (j) expressing said cDNA to produce novel polypeptides. - View Dependent Claims (49, 50)
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Specification