Alete, D.E. and Racher, A.J. and Birch, J.R. and Stansfield, S.H. and James, D.C. and Smales, C.M. (2005) Proteomic analysis of enriched microsomal fractions from GS-NS0 murine myeloma cells with varying secreted recombinant monoclonal antibody productivities. Proteomics, 5 (18). pp. 4689-4704. ISSN 1615-9853.
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| Official URL http://dx.doi.org/10.1002/pmic.200500019 |
Abstract
The folding, transport and modification of recombinant proteins in the constitutive secretory pathway of eukaryotic cell expression systems are reported to be a bottleneck in their production. We have utilised a proteomic approach to investigate the processes catalysed by proteins constituting the secretory pathway to further our understanding of those processes involved in high-level antibody secretion. We used GS-NS0 cell populations differing in qmAb to prepare enriched microsome fractions from each cell population at mid-exponential growth phase. These were analysed by 2-D PAGE to characterise the microsome protein component and test the hypothesis that bottlenecks in recombinant protein synthesis exist in these compartments, which are alleviated in high producers by the up-regulation of key secretory pathway proteins. Proteins whose abundance changed in a statistically significant manner with increasing qmAb were involved in a range of cellular functions: energy metabolism, mAb folding/assembly, cytoskeletal organisation and protein turnover. Amongst these were BiP and PDI, chaperones resident in the ER that interact with nascent immunoglobulins during their folding/assembly. However, our results suggest that there are diverse mechanisms by which these cells achieve qmAb. The results imply that cell-engineering strategies for improving qmAb should target proteins associated with altered functional phenotype identified in this study.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science |
| Divisions: | Faculties > Science Technology and Medical Studies > School of Biosciences |
| Depositing User: | Mark Smales |
| Date Deposited: | 04 Sep 2008 22:35 |
| Last Modified: | 20 May 2011 23:28 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/6218 (The current URI for this page, for reference purposes) |
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