Abstract
Surface plasmon resonance (SPR) is a standard method for evaluating direct protein-small molecule binding. While studying the catalytic mechanism of cyclic GMP-AMP synthase (cGAS), we developed an SPR-based method to measure steady-state KM values that complements traditional SPR affinity measurements. The method relies on refractive changes to detect protein interaction with substrates and products, and takes advantage of stimulator of type 1 interferon genes (STING) binding to the cGAS product, 2',3'-cGAMP. The specific method described here uses co-immobilization of cGAS and double-stranded DNA through a biotin tag; it should be generally applicable to other proteins and protein complexes.
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