This proposal will explore novel structural principles by which proteins interact with their targets and will investigates the prevalence of """"""""intrinsically disordered"""""""" proteins (IDPs) in the field of tooth biomineralization. The long term objective of the proposed research is to advance understanding of the role of extracellular matrix protein fragmentation in enamel and dentin, with a focus on the analysis of folding and the degree of disorder in the secondary structures of key proteins and polypeptides. We propose that disordered domains in the extracellular matrix proteins play substantial roles in biomineralization. We hypothesize that the programmed proteolytic activities in enamel and dentin regulate protein-mineral, protein-protein and protein- cell interactions through regulation of the number of unstructured regions and the degree of disorder in the protein sequence. Such interactions will affect chemical and cellular events such as cell signaling, macromolecular self-assembly, crystal nucleation and growth, and protein removal.
Three specific aims are proposed:
Aim I. To apply computational and biophysical strategies to analyze the secondary structures and evaluate the degree and nature of """"""""disorder"""""""" in key proteins of the extracellular matrix of enamel and dentin as well as their selected proteolytic fragments.
Aim II : To use circular dichroism (CD) and fluorescence titrations to determine the conformational changes and strength of interactions between key fragments of amelogenin and ameloblastin, as well as DPP with their macromolecular targets. To use NMR spectroscopy to monitor key amino acid residues that undergoes conformational transitions in amelogenin sequence as the result of binding to partners/targets.
Aim III : To use spectroscopical techniques (CD and ATR-FTIR) to monitor secondary structural changes and conformational transitions of selected amelogenin, enamelin, and ameloblastin proteolytic fragments, as well as DPP following their interactions with calcium and with apatite crystal surfaces. In Summary: Enamel and dentin biomineralization is the result of orchestration among a series of protein-protein, protein-mineral and protein cell interactions. Our goal is to systematically dissect the sequence and secondary structures of functional domains in major enamel extracellular matrix proteins as well as the C-terminal portion of dentin sialophosphoprotein (DPP) with regard to IDPs, and to provide information on secondary structural alteration as the result of protein-protein, protein-mineral and protein-cell surface interactions. Understanding the role of """"""""intrinsic disorder"""""""" in proteins of extracellular matrix of enamel and dentin will prepare the ground for the fabrication and development of biomimetic materials when synthetic peptides can be used to control the processes of crystal nucleation and growth. Identification of unfolded functional domains in cell signaling will have a great impact in the field of tissue regeneration. The outcomes of our study will therefore have the potential to improve treatments for repair and regeneration of oral, dental and craniofacial tissues.
This proposal will explore novel structural principles by which proteins interact with their targets and will investigates the prevalence of """"""""intrinsically disordered"""""""" proteins (IDPs) in the field of tooth biomineralization. The outcomes will prepare the ground for the fabrication and development of biomimetic materials when synthetic peptides can be used to control the processes of crystal nucleation and growth. Identification of unfolded functional domains in cell signaling will have a great impact in the field of tissue regeneration. The outcomes of our study will therefore have the potential to improve treatments for repair and regeneration of oral, dental and craniofacial tissues.
| Prajapati, S; Ruan, Q; Mukherjee, K et al. (2018) The Presence of MMP-20 Reinforces Biomimetic Enamel Regrowth. J Dent Res 97:84-90 |
| Mukherjee, Kaushik; Ruan, Qichao; Nutt, Steven et al. (2018) Peptide-Based Bioinspired Approach to Regrowing Multilayered Aprismatic Enamel. ACS Omega 3:2546-2557 |
| Klein, Ophir D; Duverger, Olivier; Shaw, Wendy et al. (2017) Meeting report: a hard look at the state of enamel research. Int J Oral Sci 9:e3 |
| Ruan, Qichao; Liberman, David; Zhang, Yuzheng et al. (2016) Assembly of Layered Monetite-Chitosan Nanocomposite and Its Transition to Organized Hydroxyapatite. ACS Biomater Sci Eng 2:1049-1058 |
| Ren, Dongni; Ruan, Qichao; Tao, Jinhui et al. (2016) Amelogenin Affects Brushite Crystal Morphology and Promotes Its Phase Transformation to Monetite. Cryst Growth Des 16:4981-4990 |
| Mazumder, P; Prajapati, S; Bapat, R et al. (2016) Amelogenin-Ameloblastin Spatial Interaction around Maturing Enamel Rods. J Dent Res 95:1042-8 |
| Su, Jingtan; Chandrababu, Karthik Balakrishna; Moradian-Oldak, Janet (2016) Ameloblastin peptide encoded by exon 5 interacts with amelogenin N-terminus. Biochem Biophys Rep 7:26-32 |
| Ruan, Qichao; Liberman, David; Bapat, Rucha et al. (2016) Efficacy of amelogenin-chitosan hydrogel in biomimetic repair of human enamel in pH-cycling systems. J Biomed Eng Inform 2:119-128 |
| Prajapati, Saumya; Tao, Jinhui; Ruan, Qichao et al. (2016) Matrix metalloproteinase-20 mediates dental enamel biomineralization by preventing protein occlusion inside apatite crystals. Biomaterials 75:260-270 |
| Lokappa, Sowmya Bekshe; Chandrababu, Karthik Balakrishna; Moradian-Oldak, Janet (2015) Tooth enamel protein amelogenin binds to ameloblast cell membrane-mimicking vesicles via its N-terminus. Biochem Biophys Res Commun 464:956-61 |
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