Abstract
Purpose
Erwinia chrysanthemi L-asparaginase (ErA) is an enzyme commonly used in the treatment regimen for Acute Lymphoblastic Leukaemia (ALL). Biopharmaceutical products such as ErA must be monitored for modifications such as deamidation, typically using ion-exchange chromatography (IEX). Analysis of clinical-grade ErA using native IEX resolves a number of enzymatically-active, acidic variants that were poorly characterised.
Methods
ErA IEX variants were isolated and fully characterised using capillary electrophoresis (cIEF), LC-MS and LC-MS/MS of proteolytic digests, and structural techniques including circular dichroism, small-angle X-ray scattering (SAXS) and ion-mobility mass spectrometry (IM-MS).
Results
LC-MS, MS/MS and cIEF demonstrated that all ErA isolates consist mainly of enzyme lacking primary-sequence modifications (such as deamidation). Both SAXS and IM-MS revealed a different conformational state in the most prominent acidic IEX peak. However, SAXS data also suggested conformational differences between the main peak and major acidic variant were minor, based on comparisons with crystal structures.
Conclusions
IEX data for biopharmaceuticals such as ErA should be thoroughly characterised, as the most common modifications, such as deamidation, may be absent.
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Abbreviations
- AHA:
-
L-aspartic acid-β-hydroxamate
- ALL:
-
Acute Lymphoblastic Leukaemia
- CCS:
-
Collision Cross Section
- CD:
-
Circular Dichroism
- CID:
-
Collision-Induced Dissociation
- cIEF:
-
Capillary Isoelectric Focussing
- DP:
-
Drug Product
- DS:
-
Drug Substance
- EcA:
-
Escherichia coli L-asparaginase
- ErA:
-
Erwinia chrysanthemi L-asparaginase
- ESI:
-
Electrospray Ionisation
- HPLC:
-
High-Pressure Liquid Chromatography
- I(q):
-
Scattering Intensity
- IEX:
-
Ion-Exchange Chromatography
- IM-MS:
-
Ion Mobility-Mass Spectrometry
- LC-MS:
-
Liquid Chromatography-Mass Spectrometry
- LC-MS/MS:
-
Liquid Chromatography-Tandem Mass Spectrometry
- MES:
-
2-(N-morpholino)ethanesulfonic acid
- MS:
-
Mass Spectrometry
- MWCO:
-
Molecular Weight Cut-Off
- P(r):
-
Pair-Distance Distribution Function
- PBP:
-
Pheromone-Binding Protein
- PDB:
-
Protein Data Bank
- PTM:
-
Post-Translational Modification
- q:
-
Scattering Vector
- Rg :
-
Radius of Gyration
- SAXS:
-
Small-Angle X-ray Scattering
- SDS-PAGE:
-
Sodium Dodecyl Sulphate Polyacrylamide Gel Electrophoresis
- TOF:
-
Time-of-Flight
- UPLC:
-
Ultra High Pressure Liquid Chromatography
- Vc :
-
Volume of Correlation
- WT:
-
Wild-Type
- XIC:
-
Extracting Ion Current
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors would like to thank Roger Hinton, Head of Development & Production for making facilities and funds available for this work, and Trevor Marks, Head of Process and Analytical Development Group, for facilitating these studies. Further thanks go to the entire Development & Production team at PHE Porton. MJD acknowledges support from the Biotechnology and Biological Sciences Research Council UK [BB/M012166/1]. NOL is funded by a BBSRC iCASE award BB/L015382/1.
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Supplementary Figure 1
Tandem MS/MS spectra of peptide unmodified peptide TGNGIVPPDEELPGLVSDSLNPAHAR (885.7868 m/z) [M+3H]3+ and deamidated peptide TGDGIVPPDEELPGLVSDSLNPAHAR (886.1136 m/z) [M+3H]3+. The abundant ions are highlighted. The mass shift of 1 Da for the b-series ions identified between unmodified and deamidated forms of the peptide, confirm the position of deamidation at N3. Also lack of mass shift in y-series ions identified also rules out deamidation and positions N21 and R26. Inset shows the isotope distribution of the parent ion. (GIF 182 kb)
Supplementary Figure 2
LC-MS/MS Isotope distribution profile for the unmodified peptide and deamidated peptide highlighting the corresponding 1 Da shift in mass. The experimental isotope profiles were compared to the theoretical isotope profiles of the peptides to confirm deamidation. (GIF 110 kb)
Supplementary Figure 3
Guinier plots of SAXS data from analyses at 1.25mg/mL concentration. (GIF 121 kb)
Supplementary Table 1
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Supplementary Table 2
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Supplementary Table 3
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Supplementary Table 4
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Supplementary Table 5
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Supplementary Table 6
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Gervais, D., King, D., Kanda, P. et al. Structural Characterisation of Non-Deamidated Acidic Variants of Erwinia chrysanthemi L-asparaginase Using Small-Angle X-ray Scattering and Ion-Mobility Mass Spectrometry. Pharm Res 32, 3636–3648 (2015). https://doi.org/10.1007/s11095-015-1722-2
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DOI: https://doi.org/10.1007/s11095-015-1722-2