Journal
JOURNAL OF IMMUNOLOGICAL METHODS
Volume 393, Issue 1-2, Pages 1-7Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jim.2013.04.001
Keywords
Single-domain antibody; Alkaline phosphatase fusion; Thermal stability; MS2 phage; Circular Dichroism; Surface plasmon resonance
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Funding
- Defense Advance Research Project Agency (DARPA)
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Single domain antibody (sdAb)-alkaline phosphatase (AP) fusion proteins have been demonstrated to be useful immunodiagnostic reagents for bio-threat agent detection. The bivalent nature of sdAb-AP fusion proteins significantly increases effective affinity and thus the sensitivity of detection, but the thermal stability of the fusion protein had not been explored. This property is critical for the development of immunoassays for use in austere environments. In this study four sdAbs with specificity for MS2 phage coat protein (CP) were expressed as fusions with AP in order to evaluate the thermal stability and affinity of the resulting constructs. The melting temperature (Tm) of the sdAb and sdAb-AP fusion proteins was measured by a combination of Circular Dichroism (CD), differential scanning calorimetry (DSC) and Fluorescence-based Thermal Shift assay. Binding kinetics were assessed using surface plasmon resonance (SPR). Our results indicated that the AP fusion protein did not increase the Tm or enhance thermal stability of the sdAb, but did provide the expected increase in binding affinity as compared to the original sdAb. Published by Elsevier B.V.
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