Cell-free synthesis and isolation of novel genes and polypeptides
First Claim
1. A method for isolating a nucleotide sequence which encodes a polypeptide of interest, comprisingtranscribing an expression unit which comprises a 5'"'"' untranslated region containing an RNA polymerase binding sequence, a ribosome binding sequence, a translation initiation signal, and one or more semi-random nucleotide sequences to produce a mRNA library;
- translating in vitro the mRNA library under conditions which maintain polysomes having polypeptide chains attached thereto;
contacting the polysomes to a substance of interest and isolating mRNA from the polysomes that specifically bind to the substance of interest.
0 Assignments
0 Petitions
Accused Products
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.
-
Citations
31 Claims
-
1. A method for isolating a nucleotide sequence which encodes a polypeptide of interest, comprising
transcribing an expression unit which comprises a 5'"'"' untranslated region containing an RNA polymerase binding sequence, a ribosome binding sequence, a translation initiation signal, and one or more semi-random nucleotide sequences to produce a mRNA library; -
translating in vitro the mRNA library under conditions which maintain polysomes having polypeptide chains attached thereto; contacting the polysomes to a substance of interest and isolating mRNA from the polysomes that specifically bind to the substance of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method for isolating a nucleotide sequence which encodes a polypeptide of interest, comprising:
-
(a) constructing an in vitro expression unit comprising a 5'"'"' untranslated region containing an RNA polymerase binding sequence, a ribosome binding sequence, and a translation initiation signal, said expression unit being capable of producing mRNA; (b) attaching one or more semi-random nucleotide sequences to said expression unit; (c) transcribing or replicating from the RNA polymerase binding sequence the sequences associated with the expression unit and semi-random nucleotide sequences 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 said mRNA; (h) recovering said mRNA, thereby isolating a nucleotide sequence which encodes a polypeptide of interest. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A method for isolating a nucleotide sequence which encodes a polypeptide of interest, 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 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; and (e) contacting said polysomes to a substance of interest and isolating mRNA from the polysomes that specifically react with the substance of interest. - View Dependent Claims (30, 31)
-
Specification