Abstract
We developed a promising candidate for a hypersensitive magnetic resonance (MR) reporter protein. The reporter protein is comprised of mouse lactate dehydrogenase-X (mLDH-X) and a hyperpolarized pyruvic acid derivative, substrate Y that gives no false-positive signals by endogenous human lactate dehydrogenases (hLDHs). The X–Y pair shows high MR sensitivity and sufficient reaction kinetics, thus enabling direct detection of reporter protein X in crude biological mixtures by monitoring the 13C NMR signal of hyperpolarized product Yr.
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