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Liu S, Yan Y, Secor CM, Oberholtzer ZR, Skow DJ, Sheikh M, Moon Y, Fu Y, Sandu C, Wang S, Li N, Nguyen JB, Rosconi MP, Pyles EA. Enrichment strategy and initial characterization of heterodimers enriched from a co-formulated cocktail of therapeutic antibodies against SARS-COV-2. MAbs 2024; 16:2338301. [PMID: 38591617 PMCID: PMC11005800 DOI: 10.1080/19420862.2024.2338301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Accepted: 03/29/2024] [Indexed: 04/10/2024] Open
Abstract
Co-formulation of multiple drug products is an efficient and convenient approach to simultaneously deliver multiple biotherapeutics with the potentially added benefit of a synergistic therapeutic effect. However, co-formulation also increases the risk of heteromeric interactions, giving rise to unique impurities with unknown efficacy and immunogenicity. Therefore, it is critical to develop methods to evaluate the risk of heteromers as an impurity that could affect potency, efficacy, and/or immunogenicity. The most direct strategy to evaluate antibody heteromers is via specific enrichment. However, the fact that antibody heterodimers generated from the co-formulated cocktail share highly similar molar mass and size properties as homodimers natively present in each individual antibody drug product poses a unique purification challenge. Here, we report the path to successful enrichment of heterodimers from co-formulated REGEN-COVⓇ and discuss its potential impacts on drug quality.
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Affiliation(s)
- Sophia Liu
- Protein Biochemistry, Regeneron Pharmaceuticals, Inc ., Tarrytown, NY, USA
| | - Yuetian Yan
- Analytical Chemistry, Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA
| | - Cody M. Secor
- Protein Biochemistry, Regeneron Pharmaceuticals, Inc ., Tarrytown, NY, USA
| | | | - Donna J. Skow
- Therapeutic Proteins, Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA
| | - Mushhood Sheikh
- Therapeutic Proteins, Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA
| | - Youmi Moon
- Protein Biochemistry, Regeneron Pharmaceuticals, Inc ., Tarrytown, NY, USA
| | - Yue Fu
- Protein Biochemistry, Regeneron Pharmaceuticals, Inc ., Tarrytown, NY, USA
| | - Cristinel Sandu
- Therapeutic Proteins, Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA
| | - Shunhai Wang
- Analytical Chemistry, Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA
| | - Ning Li
- Analytical Chemistry, Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA
| | - Jennifer B. Nguyen
- Protein Biochemistry, Regeneron Pharmaceuticals, Inc ., Tarrytown, NY, USA
| | - Michael P. Rosconi
- Protein Biochemistry, Regeneron Pharmaceuticals, Inc ., Tarrytown, NY, USA
| | - Erica A. Pyles
- Protein Biochemistry, Regeneron Pharmaceuticals, Inc ., Tarrytown, NY, USA
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Albumin-Mediated Size Exclusion Chromatography: The Apparent Molecular Weight of PSMA Radioligands as Novel Parameter to Estimate Their Blood Clearance Kinetics. Pharmaceuticals (Basel) 2022; 15:ph15091161. [PMID: 36145382 PMCID: PMC9500755 DOI: 10.3390/ph15091161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/13/2022] [Accepted: 09/14/2022] [Indexed: 11/17/2022] Open
Abstract
A meticulously adjusted pharmacokinetic profile and especially fine-tuned blood clearance kinetics are key characteristics of therapeutic radiopharmaceuticals. We, therefore, aimed to develop a method that allowed the estimation of blood clearance kinetics in vitro. For this purpose, 177Lu-labeled PSMA radioligands were subjected to a SEC column with human serum albumin (HSA) dissolved in a mobile phase. The HSA-mediated retention time of each PSMA ligand generated by this novel 'albumin-mediated size exclusion chromatography' (AMSEC) was converted to a ligand-specific apparent molecular weight (MWapp), and a normalization accounting for unspecific interactions between individual radioligands and the SEC column matrix was applied. The resulting normalized MWapp,norm. could serve to estimate the blood clearance of renally excreted radioligands by means of their influence on the highly size-selective process of glomerular filtration (GF). Based on the correlation between MW and the glomerular sieving coefficients (GSCs) of a set of plasma proteins, GSCcalc values were calculated to assess the relative differences in the expected GF/blood clearance kinetics in vivo and to select lead candidates among the evaluated radioligands. Significant differences in the MWapp,norm. and GSCcalc values, even for stereoisomers, were found, indicating that AMSEC might be a valuable and high-resolution tool for the preclinical selection of therapeutic lead compounds for clinical translation.
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Wang X, Yu H, Xing R, Li P. Characterization, Preparation, and Purification of Marine Bioactive Peptides. BIOMED RESEARCH INTERNATIONAL 2017; 2017:9746720. [PMID: 28761878 PMCID: PMC5518491 DOI: 10.1155/2017/9746720] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 05/25/2017] [Accepted: 06/01/2017] [Indexed: 12/17/2022]
Abstract
Marine bioactive peptides, as a source of unique bioactive compounds, are the focus of current research. They exert various biological roles, some of the most crucial of which are antioxidant activity, antimicrobial activity, anticancer activity, antihypertensive activity, anti-inflammatory activity, and so forth, and specific characteristics of the bioactivities are described. This review also describes various manufacturing techniques for marine bioactive peptides using organic synthesis, microwave assisted extraction, chemical hydrolysis, and enzymes hydrolysis. Finally, purification of marine bioactive peptides is described, including gel or size exclusion chromatography, ion-exchange column chromatography, and reversed-phase high-performance liquid chromatography, which are aimed at finding a fast, simple, and effective method to obtain the target peptides.
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Affiliation(s)
- Xueqin Wang
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Huahua Yu
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Ronge Xing
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Pengcheng Li
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
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Bernacki JP, Murphy RM. Length-dependent aggregation of uninterrupted polyalanine peptides. Biochemistry 2011; 50:9200-11. [PMID: 21932820 DOI: 10.1021/bi201155g] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polyalanine (polyA) is the third-most prevalent homopeptide repeat in eukaryotes, behind polyglutamine and polyasparagine. Abnormal expansion of the polyA repeat is linked to at least nine human diseases, and the disease mechanism likely involves enhanced length-dependent aggregation. Because of the simplicity of its side chain, polyA has been a favorite target of computational studies, and because of their tendency to fold into α-helix, peptides containing polyA-rich domains have been a popular experimental subject. However, experimental studies on uninterrupted polyA are very limited. We synthesized polyA peptides containing uninterrupted sequences of 7 to 25 alanines (A7 to A25) and characterized their length-dependent conformation and aggregation properties. The peptides were primarily disordered, with a modest component of α-helix that increased with increasing length. From measurements of mean distance spanned by the polyA segment, we concluded that physiological buffers are neutral solvents for shorter polyA peptides and poor solvents for longer peptides. At moderate concentration and near-physiological temperature, polyA assembled into soluble oligomers, with a sharp transition in oligomer physical properties between A19 and A25. With A19, oligomers were large, contained only a small fraction of the total peptide mass, and slowly grew into loose clusters, while A25 rapidly and completely assembled into small stable oligomers of ~7 nm radius. At high temperatures, A19 assembled into fibrils, but A25 precipitated as dense, micrometer-sized particles. A comparison of these results to those obtained with polyglutamine peptides of similar design sheds light on the role of the side chain in regulating conformation and aggregation.
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Affiliation(s)
- Joseph P Bernacki
- Department of Chemical and Biological Engineering, University of Wisconsin, Madison, Wisconsin 53706, United States
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Watanabe H, Takase A, Tokuda G, Yamada A, Lo N. Symbiotic "Archaezoa" of the primitive termite Mastotermes darwiniensis still play a role in cellulase production. EUKARYOTIC CELL 2006; 5:1571-6. [PMID: 16963639 PMCID: PMC1563587 DOI: 10.1128/ec.00100-06] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The relictual Mastotermes darwiniensis is one of the world's most destructive termites. Like all phylogenetically basal termites, it possesses protozoa in its hindgut, which are believed to help it digest wood. L. Li, J. Frohlich, P. Pfeiffer, and H. Konig (Eukaryot. Cell 2:1091-1098, 2003) recently cloned the genes encoding cellulases from the protozoa of M. darwiniensis; however, they claimed that these genes are essentially inactive, not contributing significantly to cellulose digestion. Instead, they suggested that the protozoa sequester enzymes produced by the termite in its salivary glands and use these to degrade cellulose in the hindgut. We tested this idea by performing gel filtration of enzymes in extracts of the hindgut, as well as in a combination of the salivary glands, foregut, and midgut. Three major cellulases were found in the hindgut, each of which had a larger molecular size than termite-derived salivary gland enzymes. N-terminal amino acid sequencing of one of the hindgut-derived enzymes showed that it was identical to the putative amino acid sequence of one mRNA sequence isolated by Li et al. (Eukaryot. Cell 2:1091-1098, 2003). The overall activity of the hindgut cellulases was found to be of approximately equal magnitude to the termite-derived cellulases detected in the mixture of salivary gland, foregut, and midguts. Based on these results, we conclude that, contrary to Li et al. (Eukaryot. Cell 2:1091-1098, 2003), the hindgut protozoan fauna of M. darwiniensis actively produce cellulases, which play an important role in cellulose digestion of the host termite.
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Affiliation(s)
- Hirofumi Watanabe
- National Institute of Agrobiological Science, 1-2 Owashi, Tsukuba 305-8634, Japan.
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Southan C, Lavery P, Fantom KG. Disposable microbore high-pressure liquid chromatography columns for protein and peptide separations. Anal Biochem 1999; 271:152-8. [PMID: 10419630 DOI: 10.1006/abio.1999.4139] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A range of high-performance liquid chromatography (HPLC) columns with internal diameters of 0.25 to 1.8 mm have been constructed by securing glass or plastic tubing into standard HPLC fittings. These were packed with chromatographic materials chosen for operation at moderate pressures with high flow rates. These columns were shown to be effective in a conventional HPLC instrument for peptide and protein separations in reverse-phase mode and for proteins in ion-exchange and size-exclusion modes. The simple construction and low cost of these microbore columns allow them to be considered as disposable. Using only small amounts of any type of packing material, they have the flexibility to be adapted to a wide range of analytical and micropreparative separations.
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Affiliation(s)
- C Southan
- Department of Bioinformatics, SmithKline Beecham Pharmaceuticals, Harlow, Essex, United Kingdom.
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