title: Reduced amelogenin-MMP20 interactions in amelogenesis imperfecta.
abstract: Amelogenin with a proline 41 to threonine mutation (P41T) is hydrolyzed at a lower rate by matrix metalloproteinase 20 (MMP20), resulting in an inherited tooth enamel defect, amelogenesis imperfecta (AI). The aim of this study was to elucidate the effect of P41T on the interactions between amelogenin and MMP20, which may contribute to the formation of this type of AI. The interactions of a recombinant wild-type human amelogenin and its P41T mutant with recombinant human MMP20 were compared by substrate competition assay, pull-down assay, and surface plasmon resonance (SPR). The results showed that the binding of the P41T mutant amelogenin for MMP20 was significantly lower than that of wild-type amelogenin. Our study supports a model in which the P41T mutation reduces the interactions between amelogenin and MMP20, leading to decreased degradation of amelogenin by MMP20, and resulting in AI.
authors.affiliation: Department of Orofacial Sciences, School of Dentistry, University of California at San Francisco, San Francisco, CA 94143, USA.
authors.forename: K
authors.initials: K
authors.lastname: Tanimoto
authors.forename: T
authors.initials: T
authors.lastname: Le
authors.forename: L
authors.initials: L
authors.lastname: Zhu
authors.forename: H E
authors.initials: HE
authors.lastname: Witkowska
authors.forename: S
authors.initials: S
authors.lastname: Robinson
authors.forename: S
authors.initials: S
authors.lastname: Hall
authors.forename: P
authors.initials: P
authors.lastname: Hwang
authors.forename: P
authors.initials: P
authors.lastname: Denbesten
authors.forename: W
authors.initials: W
authors.lastname: Li
mesh_terms: D000567:Amelogenesis Imperfecta / Q000235:genetics / Q000378:metabolism*; D053523:Amelogenin / Q000235:genetics / Q000378:metabolism*; D003743:Dental Enamel / Q000378:metabolism*; D006801:Humans; D053519:Matrix Metalloproteinase 20 / Q000378:metabolism*; D020641:Polymorphism, Single Nucleotide; D011392:Proline / Q000378:metabolism*; D011994:Recombinant Proteins
chemical_list: D053523:Amelogenin; D011994:Recombinant Proteins; D011392:Proline; C507111:MMP20 protein, human; D053519:Matrix Metalloproteinase 20