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Proteins and protein conjugates with increased hydrophobicity

Inactive Publication Date: 2016-06-02
REZOLUTE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes methods for attaching a medically active agent to a carrier molecule like polyethylene glycol (PEG) or a hydrophobic anion. This attachment can increase the half-life of the medication and make it more effective. The resulting formulation can slowly release the medication over a period of time, resulting in a more consistent and effective treatment. The concentration of the medication in the patient can be controlled by adjusting the amount of PEG or hydrophobic anion attached. The methods described are efficient and cost-effective, and can produce formulations that are effective in treating patients.

Problems solved by technology

The attachment of the polyethylene glycol may add molecular weight to the medically active agent and may lead to an increased half-life of the medically active agent.

Method used

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  • Proteins and protein conjugates with increased hydrophobicity
  • Proteins and protein conjugates with increased hydrophobicity
  • Proteins and protein conjugates with increased hydrophobicity

Examples

Experimental program
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Effect test

example 1

[0063]The GLP-1 C-terminal cysteine mutein (GLP-1 [7-36] plus an added cysteine at position 37) was cloned as a fusion to a larger polypeptide that contained a self-cleaving autoproteolytic sequence between GLP-1 and its fusion partner. The fusion protein was expressed in E. coli using an IPTG inducible system under the control of T7 polymerase.

example 2

[0064]The GLP-1 fusion protein was isolated from cell lysates under denaturing conditions, renatured, cleaved (autoproteolysis), and further purified using cationic chromatography. Characterization assays to confirm the peptides identity included RP-HPLC analysis, SDS-PAGE, and mass spectrometry. Commercially available synthetic cysteine mutein of GLP-1 was used as the control for these assays.

example 3

[0065]The GLP-1 cysteine mutein (produced either by a recombinant or synthetic chemical process) was PEGylated with a 5 kDa or 10 kDa cysteine-reactive maleimide-PEG by the following process. The peptide was first dissolved in 20 mM sodium phosphate buffer, pH 7.5 at a concentration of 1-5 mg / mL, and an equal molar amount of the maleimide PEG reagent was added. The reaction was allowed to continue overnight. The PEGylated GLP-1 peptide was purified using cation exchange chromatography (SP-HP Sepharose) with an equilibration buffer of 10 mM sodium acetate at pH 3.5 and a step elution buffer of 0.02% ammonium bicarbonate. The product-containing fractions were pooled, dialyzed against 0.02% ammonium bicarbonate, and lyophilized. The concentration of purified PEGylated peptide was determined by UV spectroscopy or by Bradford protein assay. Additional analytical assays performed post-PEGylation include SEC-HPLC analysis, SDS-PAGE, mass spectral analysis, N-terminal analysis, and endotoxi...

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Abstract

Examples may include a method of making a protein-PEG conjugate salt with increased hydrophobicity. The method may include providing an aqueous protein solution. This aqueous protein solution may include a protein and a pH buffer. The method may also include reacting a polyethylene glycol with the protein to form a protein-PEG conjugate. The method may further include protonating an amino group on the protein-PEG conjugate with a hydrophobic organic acid in an organic phase. The protonation may form the protein-PEG conjugate salt having a hydrophobic anion that increases the hydrophobicity-PEG conjugate salt.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of priority to U.S. Provisional Application No. 62 / 086,294, filed Dec. 2, 2014. This application is related to U.S. application Ser. No. 14 / 954,591, entitled “PROTEINS AND PROTEIN CONJUGATES WITH INCREASED HYDROPHOBICITY,” filed Nov. 30, 2015. The content of these applications is incorporated herein by reference for all purposes.BACKGROUND[0002]Delivery of a drug, hormone, protein, or other medically active agent into a patient faces a number of challenges. The medically active agent has to be delivered into the patient. Two such ways are ingestion and injection. With ingestion the drug may have to pass through a patient's digestive system before reaching the bloodstream or targeted area for treatment. Injection may allow the medically active agent to reach the bloodstream or targeted area for treatment quickly or directly, but injection may be inconvenient or painful for the patient. Once in the body, t...

Claims

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Application Information

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IPC IPC(8): A61K47/48A61K47/34A61K38/16A61K38/28A61K38/29A61K38/08A61K38/26A61K38/27
CPCA61K47/48215A61K38/26A61K47/34A61K38/16A61K38/28A61K38/29A61K38/08A61K38/27A61K9/0019A61K47/12A61K9/5031A61K9/1647A61K31/194A61K9/1682A61K47/60A61P19/10A61P31/18A61P43/00A61P5/02A61P5/06A61P5/18A61P3/10A61K9/50A61K47/64A61K47/69
Inventor ROSENDAHL, MARY S.MANTRIPRAGADA, SANKARAM B.GOMEZ, ELIANA B.
Owner REZOLUTE INC
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