Chaetopterus photoprotein: crystallization and cofactor requirements for bioluminescence.
The Chaetopterus photoprotein has been isolated in an amorphous form (molecular weight, 120,000) whlich in (NH(4))(2)SO(4) sollutionl converts to a crystalline form (molecular weight, 184,000) having the same specific light-emittinig activity; quantum yields are 0.0093 and 0.0143, respectively. Two new cofactor reqluirements have been separated fronm impure extracts: a macromnolecule resembling a nucleoprotein, and a lipid-like substance.
D000818:Animals; D000845:Annelida; D011232:Chemical Precipitation; D003460:Crystallization; D007700:Kinetics; D049449:Luminescence; D008970:Molecular Weight; D011506:Proteins / Q000302:isolation & purification*; D014461:Ultracentrifugation
D011506:Proteins