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Summary

Abstract

Introduction

Protocol

Representative Results

Discussion

Acknowledgements

Materials

References

Chemistry

Host Cell Protein Analysis using Enrichment Beads Coupled with Limited Digestion

Published: January 19th, 2024

DOI:

10.3791/65544

1Analytical Chemistry, Regeneron Pharmaceuticals Inc.

A protocol is presented for enriching host cell proteins (HCPs) from drug products (DP) and detecting peptides using proteome enrichment beads. The method is demonstrated using an in-house manufactured monoclonal antibody (mAb) drug substance (DS), which is a well-characterized reference material for evaluating and comparing different methods in terms of performance.

Host cell proteins (HCPs) are impurities that can adversely affect therapeutic proteins, even in small quantities. To evaluate the potential risks associated with drug products, methods have been developed to identify low-abundance HCPs. A crucial approach for developing a sensitive HCP detection method involves enriching HCPs while simultaneously removing monoclonal antibodies (mAbs) before analysis, utilizing liquid chromatography-mass spectrometry (LC-MS).

This protocol offers detailed instructions for enriching host cell proteins using commercially available proteome enrichment beads. These beads contain a diverse library of hexapeptide ligands with specific affinities for different proteins. The protocol also incorporates limited digestion and subsequent peptide detection using nano LC-MS/MS. By employing these techniques, HCPs with low abundance can be enriched over 7000-fold, resulting in an impressive detection limit as low as 0.002 ppm. Significantly, this protocol enables the detection of 850 HCPs with a high level of confidence using a NIST mAb. Moreover, it is designed to be user-friendly and includes a video demonstration to assist with its implementation. By following these steps, researchers can effectively enrich and detect HCPs, enhancing the sensitivity and accuracy of risk assessment for drug products.

Host cell proteins (HCPs) are impurities that are released from the cell culture of the host organism and co-purified with monoclonal antibody (mAb)1,2,3,4. Trace levels of HCPs can negatively impact the quality of the drug product5,6,7,8,9,10,11,12,

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Abbreviations used in the protocol are listed in Supplementary Table 1.

1. Preparation of solutions and buffers

NOTE: The commercial details of all the reagents are listed in the Table of Materials.

  1. Prepare 0.1 M Tris-HCl, pH 8.0 solution by adding 1 mL of 1 M Tris-HCl, pH 8.0 into 9 mL of deionized water in a glass vial, and mix well by vortexing. Store at 4 °C for up to 3 months.
  2. Prepare.......

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This protocol presented a sample preparation workflow, termed protein enrichment coupled with limited digestion (PMLD), for the analysis of host cell proteins (HCPs) in a monoclonal antibody (mAb) sample. Figure 1 illustrates the step-by-step procedure of PMLD. The researchers compared the results of HCP analysis using direct digestion (shown in the top panel of Figure 2) and PMLD (shown in the bottom panel of Figure 2). The Total I.......

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There are two versions of commercially available protein enrichment beads: one with a smaller capacity and the other with a larger capacity (see Table of Materials). Both versions of the enrichment beads contain ten preps in the package. The manufacturer's instructions suggest that each prep from the small capacity kit can be used to enrich 10 mg of total protein. However, for optimal performance of host cell protein (HCP) enrichment from DS, each prep is good for five DS samples. Therefore, each kit can.......

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None.

....

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Name Company Catalog Number Comments
16 G, Metal Hub Needle, 2 in, point style 3 Hamilton 91016
Acclaim PepMap 100 C18 trap column (20 cm × 0.075 mm) Thermo Fisher 164535
Acetonitrile Fisher-Scientific A955
Acetonitrile with 0.1% Formic Acid (v/v), Optima LC/MS Grade  Fisher-Scientific LS120-4
Amicon Ultra-0.5 Centrifugal Filter Unit Millipore Sigma UFC5010
C18 analytical column (0.075 mm × 1.7 μm × 30 cm, 100 Å) CoAnn Technologies HEB07503001718I
Centrifuge 5424 Eppendorf 5405000646
Dithiothreitol (DTT)  Thermo Fisher A39255
Frit for SPE cartridges, 9.5 mm, 3 mL, 100/pk Agilent 12131020
GL-Tip GC GL Sciences Inc   7820-11201
in-house mAb Regeneron concentration 200 mg/mL
Iodoacetamide (30 x 9.3 mg) Thermo Fisher A39271
Isopropanol Fisher-Scientific 149320025
L-Histidine Sigma Aldrich H6034
L-Histidine monohydrochloride monohydrate Sigma Aldrich 53370
Methanol Fisher-Scientific A456-4 
Milli-Q Millpore 30035
NanoDrop 2000 Thermo Scientific ND-2000
Orbitrap Exploris 480 Thermo Fisher BRE725539
Protein LoBind Tube 0.5 mL Eppendorf (VWR) 22431064
Protein LoBind Tube 2.0 mL Eppendorf (VWR) 22431102
Proteome Discoverer software 2.4 Thermo Scientific
ProteoMiner Protein Enrichment Large-Capacity Kit Bio-Rad 1633007
ProteoMiner Protein Enrichment Small-Capacity Kit Bio-Rad 1633006
Sodium deoxycholate (SDC) Sigma Aldrich D6750
Sodium lauroyl sarcosinate (SLS)  Sigma Aldrich L5777
SpeedVac Labconco 7970010
Thermomixer R Eppendorf 22670107
Trifluoracetic acid (TFA) Fisher-Scientific 28904
Trypsin (Sequencing Grade Modified)  (5 x 20 ug) Promega V5111
Tube Revolver Rotator Thermo Fisher 88881001
UltiMate 3000 RSLC nano system Thermo Fisher ULTIM3000RSLCNANO
UltraPure 1 M Tris-HCl pH 8.0 Thermo Fisher 15568-025
Vortex Genie 2 VWR 102091-234
Water with 0.1% Formic Acid (v/v), Optima LC/MS Grade  Fisher-Scientific LS118-4 

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