Many existing
protein detection strategies depend on highly functionalized antibody
reagents. A simpler and easier to produce class of
detection reagent is highly desirable. We designed a single-component, recombinant, luminescent
biosensor that can be expressed in
laboratory strains of E. coli and
S. cerevisiae. This
biosensor is deployed in multiple homogenous and immobilized assay formats to detect recombinant
SARS-CoV-2 spike
antigen and cultured
virus. The chemiluminescent signal generated facilitates
detection by an
un-augmented
cell phone camera. Binding Activated Tandem split-
enzyme (BAT)
biosensors may serve as a useful template for diagnostics and
reagents that detect
SARS-CoV-2 antigens and other
proteins of interest.