   2.8.2.10 | physiological function |
in Cypridina (Vargula) hilgendorfii, Cypridina luciferin is converted from Cypridina luciferyl sulfate by a sulfotransferase with adenosine 3',5'-diphosphate (PAP), and is used for the luminescence reaction of Cypridina luciferase. The luminescence activity of crude extracts of Cypridina hilgendorfii is significantly stimulated by the addition of acetic acid. This stimulation may be explained by an efficient supply of PAP from 3'-phosphoadenosine 5'-phosphosulfate (PAPS) catalyzed by the sulfotransferase. Acetic acid acts as a sulfate acceptor from PAPS, followed by forming acetyl sulfate and PAP. The structure of acetyl sulfate is identified using mass spectrometry and it spontaneously decomposed to acetic acid and free sulfate ion in aqueous solutions. This enzymatic conversion from Cypridina luciferyl sulfate to Cypridina luciferin coupled with acetic acid and PAPS by the luciferin sulfotransferase, enzymatic cycling of Cypridina luciferyl sulfate to Cypridina luciferin coupled with acetic acid and PAPS |
760508 |
