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Immobilization of growth factors using cellulose binding domain-cytokine fusion proteins Jervis, Eric J.
Abstract
This study describes the application and characterization of cellulose binding domain (CBD)- cytokine fusion proteins for the cultivation of cytokine dependent cells. The affinity, binding reversibility and surface diffusivity of type-U CBDs are analyzed. Binding of CBDs to crystalline cellulose is irreversible with respect to protein dilution in the solution phase. The surface diffusion rates of an exo-β-l-4-glycanase (Cex), an endo- β -l-4-glucanase (CenA), and their respective isolated CBDs, are quantified using fluorescence recovery after photobleaching analysis. Greater than 70% of bound molecules are mobile on the cellulose surface (Dsurf ~ 3 x 10 ⁻¹¹ cm² /sec). Surface diffusion rates are dependent on surface coverage density and temperature ( Ea ~ 45 kJ/mol.K). These attributes of the C B D suggest that C B D fusion proteins are not simply immobilized on the cellulose surface, but rather localized at it, so as to retain 2- dimensional mobility. Localization of cytokines to cellulose via a C B D affinity tag, provides a convenient method for adsorbing growth factors to a solid phase (cellulose) in a surface-active form. Bioactivity and long term stability of CBD-cytokine adsorption to microcrystalline cellulose under cell culture conditions is demonstrated. Cellulose-bound fusion proteins of murine stem cell factor with CBDcex (CBD-SCF), murine interleukin-3 with CBDCenA (CBD-IL3) and murine interleukin-2 with CBDcenA (CBD-IL2), stimulate the proliferation of their respective factor dependent cells. Cellulose localization of CBD-SCF results in a significant increase in the persistence of tyrosine activation of the SCF receptor. Furthermore, when cells are incubated with cellulose-bound CBD-SCF, activated receptors and CBD-SCF co-localize at the cellulose surface. In contrast to the surface diffusion of CBDC ex, CBD-SCF does not diffuse on crystalline cellulose. This is likely a result of the formation of CBD-SCF dimers (through SCF domain dimerization) at the cellulose interface.
Item Metadata
Title |
Immobilization of growth factors using cellulose binding domain-cytokine fusion proteins
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1998
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Description |
This study describes the application and characterization of cellulose binding domain (CBD)-
cytokine fusion proteins for the cultivation of cytokine dependent cells. The affinity, binding
reversibility and surface diffusivity of type-U CBDs are analyzed. Binding of CBDs to
crystalline cellulose is irreversible with respect to protein dilution in the solution phase. The
surface diffusion rates of an exo-β-l-4-glycanase (Cex), an endo- β -l-4-glucanase (CenA), and
their respective isolated CBDs, are quantified using fluorescence recovery after photobleaching
analysis. Greater than 70% of bound molecules are mobile on the cellulose surface (Dsurf ~ 3 x 10 ⁻¹¹ cm² /sec). Surface diffusion rates are dependent on surface coverage density and
temperature ( Ea ~ 45 kJ/mol.K). These attributes of the C B D suggest that C B D fusion proteins
are not simply immobilized on the cellulose surface, but rather localized at it, so as to retain 2-
dimensional mobility.
Localization of cytokines to cellulose via a C B D affinity tag, provides a convenient method
for adsorbing growth factors to a solid phase (cellulose) in a surface-active form. Bioactivity and
long term stability of CBD-cytokine adsorption to microcrystalline cellulose under cell culture
conditions is demonstrated. Cellulose-bound fusion proteins of murine stem cell factor with
CBDcex (CBD-SCF), murine interleukin-3 with CBDCenA (CBD-IL3) and murine interleukin-2
with CBDcenA (CBD-IL2), stimulate the proliferation of their respective factor dependent cells.
Cellulose localization of CBD-SCF results in a significant increase in the persistence of tyrosine
activation of the SCF receptor. Furthermore, when cells are incubated with cellulose-bound
CBD-SCF, activated receptors and CBD-SCF co-localize at the cellulose surface. In contrast to
the surface diffusion of CBDC ex, CBD-SCF does not diffuse on crystalline cellulose. This is
likely a result of the formation of CBD-SCF dimers (through SCF domain dimerization) at the
cellulose interface.
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Extent |
16353262 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-06-19
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0058770
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1998-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.