Abstract

We have investigated effects of platinum nanoparticles (PtNPs) on protein crystal nucleation. The presence of PtNPs increased the number of crystals in a crystallization solution, indicating that the PtNPs have the ability to promote the crystal nucleation. Dynamic light scattering measurements revealed that the PtNP gathers more than 10 lysozyme molecules around it to form an embryonic complex of PtNP and lysozyme. Zeta potential measurements revealed that the charges of the lysozyme molecules were reduced by delocalization of their charges in the complex. As a result, the energy barrier of association between the complexes is reduced, followed by the nucleation.

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