Resistivity to denaturation of the apoprotein of aequorin and reconstitution of the luminescent photoprotein from the partially denatured apoprotein. 1981

O Shimomura, and A Shimomura

Although native aequorin is highly susceptible to inactivation, apoaequorin is highly resistant to various processes of denaturation. Apoaequorin was inactivated only partially at a temperature of 95 degrees C or by treatments with 6 M-urea, 4 M-guanidine hydrochloride, 1 M-HCl and 1 M-NaOH. It was nearly completely inactivated in 85% ethanol or by heating at 95 degrees C in 2 M-(NH4)2SO4, but over 50% of apoaequorin activity was restored in both cases merely by dissolving the coagulated protein in 4 M-guanidine hydrochloride. In the reconstitution of aequorin, partially inactivated apoaequorin yielded more aequorin than expected from the activity of the partially inactivated apoaequorin used, suggesting that the process of reconstitution promotes the renaturation of denatured apoaequorin.

UI MeSH Term Description Entries
D008164 Luminescent Proteins Proteins which are involved in the phenomenon of light emission in living systems. Included are the "enzymatic" and "non-enzymatic" types of system with or without the presence of oxygen or co-factors. Bioluminescent Protein,Bioluminescent Proteins,Luminescent Protein,Photoprotein,Photoproteins,Protein, Bioluminescent,Protein, Luminescent,Proteins, Bioluminescent,Proteins, Luminescent
D011489 Protein Denaturation Disruption of the non-covalent bonds and/or disulfide bonds responsible for maintaining the three-dimensional shape and activity of the native protein. Denaturation, Protein,Denaturations, Protein,Protein Denaturations
D006358 Hot Temperature Presence of warmth or heat or a temperature notably higher than an accustomed norm. Heat,Hot Temperatures,Temperature, Hot,Temperatures, Hot
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000331 Aequorin A photoprotein isolated from the bioluminescent jellyfish Aequorea. It emits visible light by an intramolecular reaction when a trace amount of calcium ion is added. The light-emitting moiety in the bioluminescence reaction is believed to be 2-amino-3-benzyl-5-(p-hydroxyphenyl)pyrazine (AF-350). Aequorine
D001059 Apoproteins The protein components of a number of complexes, such as enzymes (APOENZYMES), ferritin (APOFERRITINS), or lipoproteins (APOLIPOPROTEINS). Apoprotein

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