Truncated EGFR Cell Surface Marker for Precise Targeting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cell surface markers for cell therapy lack consistent high-level expression and functional inertness, making it difficult to selectively target and remove engineered cells, especially in vivo.
Innovation Solution
A recombinant polypeptide comprising a human epidermal growth factor receptor (EGFR) Domain III sequence with a net-neutral or positively charged juxtamembrane domain, lacking an active tyrosine kinase domain, is used to create a cell surface marker that can be recognized by anti-EGFR antibodies for targeted elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a truncated EGFR receptor is used as a cell surface marker, then functional inertness is achieved, but expression levels are insufficient for reliable targeting
Solution Approach 1:
The EGFR receptor is segmented into distinct functional domains: the extracellular domain III is retained for antibody binding, the transmembrane domain is preserved for cell surface localization, while the intracellular tyrosine kinase domain is completely removed to eliminate biological activity. This segmentation allows the marker to maintain binding functionality while achieving functional inertness.
Solution Approach 2:
The juxtamembrane intracellular region is engineered with specific local properties (net-neutral or net-positive charge in the first three amino acids) to enhance cell surface expression levels. This localized modification of charge distribution in the intracellular region improves marker quantity without affecting the extracellular binding domain or introducing kinase activity.
2Quantity of substance
If the full EGFR receptor is used, then high expression levels are achieved, but biological activity causes unwanted side effects
Solution Approach 1:
The harmful tyrosine kinase domain (intracellular region) is extracted and removed from the EGFR receptor structure. Only the essential extracellular domain III and transmembrane domain are retained, creating a truncated receptor that serves purely as a cell surface marker without the ability to transduce biological signals or cause unwanted cellular responses.
3Ease of manufacture
If conventional cell surface markers are used, then ease of manufacture is maintained, but selective targeting and removal capability is lacking
Solution Approach 1:
The truncated EGFR marker serves multiple functions: it provides a cell surface localization signal for proper protein trafficking, maintains a defined epitope for antibody recognition and targeting, and enables selective removal through antibody-dependent cellular cytotoxicity. This multi-functionality allows conventional manufacturing approaches to be used while achieving superior targeting capability.
Data Source
AI summary
The present disclosure relates to EGFR-derived polypeptides containing short juxtamembrane sequences, nucleic acids encoding them, and methods of using them to improve cell surface expression of truncated EGFR markers.