Fusion protein-bound magnetic particles for recombinant production and magnetic separation of polypeptides of interest
First Claim
1. A fusion protein comprising:
- (a) a fragment of the magA gene product, the fragment comprising the amino acid sequence shown as residues 7-380 of SEQ ID NO;
2,(b) the amino acid sequence of a first protein of interest, and(c) optionally, the amino acid sequence of a second protein of interest;
wherein the first and optional second proteins of interest are the same or different, and wherein the first and optional second proteins of interest are joined to the N- or C-terminal of the fragment of the magA gene product.
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Accused Products
Abstract
A fusion DNA sequence, which is obtained by fusing a gene coding for another useful protein to a fragment of a magA gene coding for a protein bound to an organic membrane for covering magnetic particles produced in cells of a magnetic bacterium AMB-1, is expressed in the magnetic bacterium to obtain the protein in a state of being bound to the magnetic particles. According to the present invention, useful proteins such as enzymes and antibodies can be stably obtained in a state of being bound to the organic membrane of the magnetic particles only by cultivating a transformed magnetic bacterium, and separating the magnetic particles produced in cells, without any necessity to perform a treatment such as immobilization. The functional protein immobilized on the magnetic particles can be magnetically controlled. Thus the function can be efficiently exhibited at a desired topical position. Magnetic particles to which a desired protein is bound can be semipermanently produced only by maintaining and cultivating an identical bacterial strain. Since the protein is produced on the magnetic particles, an objective protein can be magnetically separated and recovered in a short period of time. Thus it is possible to perform efficient separation and purification.
12 Citations
17 Claims
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1. A fusion protein comprising:
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(a) a fragment of the magA gene product, the fragment comprising the amino acid sequence shown as residues 7-380 of SEQ ID NO;
2,(b) the amino acid sequence of a first protein of interest, and (c) optionally, the amino acid sequence of a second protein of interest; wherein the first and optional second proteins of interest are the same or different, and wherein the first and optional second proteins of interest are joined to the N- or C-terminal of the fragment of the magA gene product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fusion protein comprising:
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(a) a fragment of the magA gene product, the fragment comprising the amino acid sequence shown as residues 7-380 of SEQ ID NO;
2, and(b) the amino acid sequence of a protein of interest selected from the group consisting of an immunoglobulin, a binding protein, and an enzyme; wherein the protein of interest is joined to the N- or C-terminal of the fragment of the magA gene product. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification