A point mutation of human nucleoside diphosphate kinase A found in aggressive neuroblastoma affects protein folding.

The Journal of Biological Chemistry
I LascuM Konrad

Abstract

The point mutation serine 120 to glycine in the human nucleoside diphosphate kinase A has been identified in several aggressive neuroblastomas (Chang, C. L., Zhu, X. X., Thoraval, D. H., Ungar, D., Rawwas, J., Hora, N., Strahler, J. R., Hanash, S. M. & Radany, E. (1994) Nature 370, 335-336). We expressed in bacteria and purified wild-type and S120G mutant nucleoside diphosphate kinase A. The mutant enzyme had enzymatic and structural properties similar to the wild-type enzyme, whereas its stability to denaturation by heat and urea was markedly reduced. More importantly, upon renaturation of the urea-denatured mutant protein, a folding intermediate accumulated, having the characteristics of a molten globule. It had no tertiary structure, as shown by near UV circular dichroism, whereas the secondary structure was substantially recovered. The hydrophobic probe 8-anilino-1-naphthalene sulfonate bound to the intermediate species with an increase in fluorescence intensity and a blue shift. The hydrodynamic size was between that expected for a folded and an unfolded monomer. Finally, electrophoresis in a transverse urea gradient displayed no renaturation curve, and the protein showed the tendency to aggregate at the lowest urea concen...Continue Reading

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