Purification of structurally ordered recombinant protein polymers
First Claim
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1. A method of purification of substantially insoluble protein polymers, said polymers being characterized by being prepared by recombinant techniques, having long stretches of repeating units of silk fibroin and sufficient stretches of the repeating units so that the polymers have the structural order of silk, said method comprising:
- treating and lysing cells to provide lysate comprising said protein polymers in insoluble form;
suspending the disrupted cells from said lysate in an aqueous medium;
separating high molecular weight insoluble material from the suspension;
extracting said separated high molecular weight insoluble material at a temperature in the range of about 60°
to 100°
C. with an aqueous detergent solution; and
isolating the purified protein polymer.
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Abstract
Recombinant structural and functional polymers are purified by lysing of the cellular host, separation of the solid materials, washing and extraction of contaminants using a detergent solution at elevated temperatures.
98 Citations
6 Claims
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1. A method of purification of substantially insoluble protein polymers, said polymers being characterized by being prepared by recombinant techniques, having long stretches of repeating units of silk fibroin and sufficient stretches of the repeating units so that the polymers have the structural order of silk, said method comprising:
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treating and lysing cells to provide lysate comprising said protein polymers in insoluble form; suspending the disrupted cells from said lysate in an aqueous medium; separating high molecular weight insoluble material from the suspension; extracting said separated high molecular weight insoluble material at a temperature in the range of about 60°
to 100°
C. with an aqueous detergent solution; andisolating the purified protein polymer. - View Dependent Claims (2, 3, 4)
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5. A method of purification of substantially insoluble protein polymers, said polymers being characterized by being prepared by recombinant techniques, having long stretches of silk fibroin repeating units and having sufficient stretches of the repeating units so that the polymers have the structural order of silk, said method comprising:
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treating and lysing cells comprising said protein polymers by mechanical disruption to provide lysate comprising said protein polymers in insoluble form; separating high molecular weight insoluble material from said lysate by means of centrifugation; extracting said separated high molecular weight insoluble material at a temperature in the range of about 80°
to 100°
C. with an aqueous anionic sulfuric acid based detergent solution, said detergent being present in from about 1 to 3% w/v; andisolating the purified protein polymer by centrifugation. - View Dependent Claims (6)
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Specification