期刊
CRYSTAL GROWTH & DESIGN
卷 18, 期 12, 页码 7391-7400出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.8b01066
关键词
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资金
- National Institutes of Health, NIDCR [R01-DE013414]
- U.S. Department of Energy (DOE) [DE-AC0S-76RL01830]
- Laboratory Directed Research and Development Program at Pacific Northwest National Laboratory
- Department of Energy's Office of Biological and Environmental Research
- U.S. DOE [DEAC02-06CH11357]
Although amelogenin comprises the vast majority of the matrix that templates calcium phosphate nucleation during enamel formation, other proteins, particularly enamelin, are also known to play an important role in the formation of enamel's intricate architecture. However, there is little understanding of the interplay between amelogenin and enamelin in controlling processes of mineral nucleation and growth. Here, we used an in vitro model to investigate the impact of enamelin interaction with amelogenin on calcium phosphate nucleation for a range of enamelin-to-amelogenin ratios. We found that amelogenin alone is a weak promoter of nucleation, but addition of enamelin enhanced nucleation rates in a highly nonlinear, nonmonotonic manner reaching a sharp maximum at a ratio of 1:50 enamelin/amelogenin. We provide a phenomenological model to explain this effect that assumes only isolated enamelin proteins can act as sites of enhanced nucleation, while enamelin oligomers cannot. Even when interaction is random, the model reproduces the observed behavior, suggesting a simple means to tightly control the timing and extent of nucleation and phase transformation by amelogenin and enamelin.
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