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by claude@2026-06, 2026-06-24
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This paper describes a de novo computational protein design strategy to engineer a water-soluble mimic of the transmembrane protein CD20 by replacing its central transmembrane helix with a water-soluble dimerizing helix, thereby presenting the native CD20 extracellular loop in a binding-competent quaternary structure. The authors report that this “soluble CD20” is easy to produce, remains folded above 60°C, and supports high-throughput binder screening using yeast display, while binding tightly to monoclonal antibodies recognizing quaternary extracellular epitopes; they note the key limitation that the approach addresses solubility for screening rather than solving native CD20 behavior in membranes. Overall, the work demonstrates that computational scaffolding can transplant conformational epitopes from complex membrane proteins into soluble formats suitable for protein engineering. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.
Abstract
The poor solubility of integral membrane proteins in water frequently hinders studies with these proteins, presenting challenges for structure determination and binding screens. For instance, the transmembrane protein CD20, which is an important target for treating B-cell malignancies, is not soluble in water and cannot be easily screened against potential protein binders with techniques like phage display or yeast display. Here, we use de novo protein design to create a water-soluble mimic of the CD20 dimer (“soluble CD20”). Soluble CD20 replaces the central transmembrane helix of CD20 with a water-soluble helix that dimerizes to form a coiled coil that structurally matches the dimer interface of native CD20 and presents the central extracellular loop of CD20 in a binding competent conformation. Unlike peptides derived from CD20, soluble CD20 binds tightly to monoclonal antibodies that recognize quaternary epitopes on the extracellular face of CD20. We demonstrate that soluble CD20 is easy to produce, remains folded above 60°C, and is compatible with binder screening via yeast display. Our results highlight the ability of computational protein design to scaffold conformational epitopes from membrane proteins for use in binding and protein engineering studies. Importance This study demonstrates that computational protein design can be used to create water soluble variants of transmembrane proteins. The water-soluble CD20 mimic created here is compatible with high throughput binding screens and should be useful for developing next generation anti-CD20 therapeutics.
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Abstract
The poor solubility of integral membrane proteins in water frequently hinders studies with these proteins, presenting challenges for structure determination and binding screens. For instance, the transmembrane protein CD20, which is an important target for treating B-cell malignancies, is not soluble in water and cannot be easily screened against potential protein binders with techniques like phage display or yeast display. Here, we use de novo protein design to create a water-soluble mimic of the CD20 dimer (“soluble CD20”). Soluble CD20 replaces the central transmembrane helix of CD20 with a water-soluble helix that dimerizes to form a coiled coil that structurally matches the dimer interface of native CD20 and presents the central extracellular loop of CD20 in a binding competent conformation. Unlike peptides derived from CD20, soluble CD20 binds tightly to monoclonal antibodies that recognize quaternary epitopes on the extracellular face of CD20. We demonstrate that soluble CD20 is easy to produce, remains folded above 60°C, and is compatible with binder screening via yeast display. Our results highlight the ability of computational protein design to scaffold conformational epitopes from membrane proteins for use in binding and protein engineering studies.
Importance This study demonstrates that computational protein design can be used to create water soluble variants of transmembrane proteins. The water-soluble CD20 mimic created here is compatible with high throughput binding screens and should be useful for developing next generation anti-CD20 therapeutics.
Competing Interest Statement
The authors have declared no competing interest.
Abbreviations
- CMPs
- Complex membrane proteins
- ECDs
- Extracellular Domains
- CDC
- Complement-Dependent Cytotoxicity
- PCD
- Programmed Cell Death
- mAbs
- Monoclonal Antibodies
- Fab
- fragment antigen-binding
- scFv
- single chain variable fragment
- CD
- Circular Dichroism
- Tm
- Melting Temperature
- TM
- transmembrane helix
- SEC-MALS
- Size Exclusion Chromatography-Multi Angle Light Scattering
- BLI
- Bio-Layer Interferometry
- SPR
- Surface Plasmon Resonance
- RTX
- Rituximab
- OBZ
- Obinutuzumab
- RMSD
- Root-Mean-Square Deviation
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