Catalytic subunit of oplophorus-luciferin 2-monooxygenase. Oxidoreductase that converts coelenterazine (the oplophorus luciferin) to coelenteramide under emission of blue light with a maximum at 454 nm. Is also active with bisdeoxycoelenterazine. coelenterazine + O2 = CO2 + coelenteramide + hnu Inhibited by micromolar Cu(2+). Optimum pH is 8-9. Optimum temperature is 40 degrees Celsius. Heterotetramer of a catalytic 19 kDa and a non-catalytic 35 kDa subunit. The shrimp has luminous glands at the base of its antennae and legs, and ejects a cloud of brightly luminescent secretion from the base of its antennae upon stimulation.