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2015 ; 15
(1
): 129-136
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Effect of Otoconial Proteins Fetuin A, Osteopontin, and Otoconin 90 on the
Nucleation and Growth of Calcite
#MMPMID25709560
Hong M
; Moreland KT
; Chen J
; Teng HH
; Thalmann R
; De Yoreo JJ
Cryst Growth Des
2015[Jan]; 15
(1
): 129-136
PMID25709560
show ga
We investigated the roles of three proteins associated with the formation of
otoconia including fetuin A, osteopontin (OPN), and otoconin 90 (OC90). In situ
atomic force microscopy (AFM) studies of the effects of these proteins on the
growth of atomic steps on calcite surfaces were performed to obtain insight into
their effects on the growth kinetics. We also used scanning electron microscopy
to examine the effects of these proteins on crystal morphology. All three
proteins were found to be potent inhibitors of calcite growth, although fetuin A
promoted growth at concentrations below about 40 nM and only became an inhibitor
at higher concentrations. We then used in situ optical microscopy to observe
calcite nucleation on films of these proteins adsorbed onto mica surfaces. By
measuring the calcite nucleation rate as a function of supersaturation, the value
of the interfacial energy that controls the free energy barrier to heterogeneous
nucleation was determined for each protein. OPN and OC90 films led to
significantly reduced interfacial energies as compared to the value for
homogeneous calcite nucleation in bulk solution. The value for fetuin A was equal
to that for bulk solution within experimental error. Zeta potential measurements
showed all of the proteins possessed negative surface charge and varied in
magnitude according to sequence fetuin A > OC90 > OPN. In addition, the
interfacial energies exhibited an inverse scaling with the zeta potential. In
analogy to previous measurements on polysaccharide films, this scaling indicates
the differences between the proteins arise from the effect of protein surface
charge on the solution-substrate interfacial energy.