Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Identification of major matrix metalloproteinase-20 proteolytic processing products of murine amelogenin and tyrosine-rich amelogenin peptide using a nuclear magnetic resonance spectroscopy based method

Journal Article · · Archives of Oral Biology

Objective: The aim of this study was to identify major matrix metalloproteinase-20 (MMP20) proteolytic processing products of amelogenin over time and determine if the tyrosine-rich amelogenin peptide (TRAP) was a substrate of MMP20. Design: Recombinant 15N-labeled murine amelogenin and 13C,15N-labeled TRAP were incubated with MMP20 under conditions where amelogenin self-assembles into nanospheres. Digestion products were fractionated by reverse-phase high-performance liquid chromatography at various time points. Product identification took advantage of the intrinsic disorder property of amelogenin that results in little change to its fingerprint 1H-15N heteronuclear single-quantum coherence nuclear magnetic resonance spectrum in 2% acetic acid upon removing parts of the protein, allowing cleavage site identification by observing which amide cross peaks disappear. Results: The primary product in five out of the six major reverse-phase high-performance liquid chromatography bands generated after a 24 hour incubation of murine amelogenin with MMP20 were: S55-L163, P2-L147, P2-E162, P2-A167, and P2-R176. After 72 hours these products were replaced with five major reverse-phase high-performance liquid chromatography bands containing: L46-A170, P2-S152, P2-F151, P2-W45, and short N-terminal peptides. TRAP was completely digested by MMP20 into multiple small peptides with the initial primary site of cleavage between S16 and Y17. Conclusions: Identification of the major MMP20 proteolytic products of amelogenin confirm a dynamic process, with sites towards the C-terminus more rapidly attacked than sites near the N-terminus. This observation is consistent with nanosphere models where the C-terminus is exposed and the N-terminus more protected. One previously reported end-product of the MMP20 proteolytic processing of amelogenin, TRAP, is shown to be an in vitro substrate for MMP20.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1503496
Report Number(s):
PNNL-SA-132678
Journal Information:
Archives of Oral Biology, Journal Name: Archives of Oral Biology Journal Issue: C Vol. 93; ISSN 0003-9969
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

References (35)

Complete amino acid sequence of amelogenin in developing bovine enamel journal June 1984
Identification and characterization of amelogenin genes in monotremes, reptiles, and amphibians journal October 1998
Amelogenin “nanorods” formation during proteolysis by Mmp-20 journal November 2011
MMP-20 mutation in autosomal recessive pigmented hypomaturation amelogenesis imperfecta journal March 2005
Mmp-20 and Klk4 Cleavage Site Preferences for Amelogenin Sequences journal September 2009
X-linked amelogenesis imperfecta may result from decreased formation of tyrosine rich amelogenin peptide (TRAP) journal March 2003
Amelogenin Post-translational Modifications: Carboxy-Terminal Processing and the Phosphorylation of Bovine and Porcine "TRAP" and "LRAP" Amelogenins journal November 1993
Supramolecular Assembly of Amelogenin Nanospheres into Birefringent Microribbons journal March 2005
Use of human amelogenin in molecular encapsulation for the design of pH responsive microparticles journal January 2012
Biomimetic Systems for Hydroxyapatite Mineralization Inspired By Bone and Enamel journal November 2008
Mass-spectrometry-based metabolomics: limitations and recommendations for future progress with particular focus on nutrition research journal June 2009
A solution NMR investigation into the murine amelogenin splice-variant LRAP (Leucine-Rich Amelogenin Protein) journal September 2010
Functional and Structural Characterization of DR_0079 from Deinococcus radiodurans , a Novel Nudix Hydrolase with a Preference for Cytosine (Deoxy)ribonucleoside 5′-Di- and Triphosphates journal June 2008
The proteolytic processing of amelogenin by enamel matrix metalloproteinase (MMP-20) is controlled by mineral ions journal March 2013
Amelogenesis Imperfecta: Genotype-Phenotype Studies in 71 Families journal January 2011
The Structural Biology of the Developing Dental Enamel Matrix journal June 1999
The Tooth Enamel Protein, Porcine Amelogenin, Is an Intrinsically Disordered Protein with an Extended Molecular Configuration in the Monomeric Form journal March 2009
Improved protocol to purify untagged amelogenin – Application to murine amelogenin containing the equivalent P70 → T point mutation observed in human amelogenesis imperfecta journal January 2015
Homozygous and Compound Heterozygous MMP20 Mutations in Amelogenesis Imperfecta journal April 2013
A solution NMR investigation into the impaired self-assembly properties of two murine amelogenins containing the point mutations T21→I or P41→T journal September 2013
1H, 13C, and 15N resonance assignments of murine amelogenin, an enamel biomineralization protein journal April 2008
The leucine-rich amelogenin protein (LRAP) is primarily monomeric and unstructured in physiological solution journal April 2015
Murine matrix metalloproteinase-20 overexpression stimulates cell invasion into the enamel layer via enhanced Wnt signaling journal July 2016
Identification of the leucine-rich amelogenin peptide (LRAP) as the translation product of an alternatively spliced transcript journal February 1991
Expression, Structure, and Function of Enamel Proteinases journal January 2002
Immobilized metal-affinity chromatography protein-recovery screening is predictive of crystallographic structure success journal August 2011
Proteinases in Developing Dental Enamel journal July 1999
The pH Dependent Amelogenin Solubility and its Biological Significance journal January 1998
Dissecting Amelogenin Protein Nanospheres: CHARACTERIZATION OF METASTABLE OLIGOMERS journal August 2011
Porcine Amelogenin: Alternative Splicing, Proteolytic Processing, Protein-Protein Interactions, and Possible Functions journal January 2011
Enamelysin (Matrix Metalloproteinase 20)-deficient Mice Display an Amelogenesis Imperfecta Phenotype journal December 2002
Dental enamel matrix: Sequences of two amelogenin polypeptides journal October 1981
Origin, Splicing, and Expression of Rodent Amelogenin Exon 8 journal October 2006
Matrix Metalloproteinase-20 Over-Expression Is Detrimental to Enamel Development: A Mus musculus Model journal January 2014
Characterization of Recombinant Pig Enamelysin Activity and Cleavage of Recombinant Pig and Mouse Amelogenins journal March 1999

Cited By (1)

The energetic basis for hydroxyapatite mineralization by amelogenin variants provides insights into the origin of amelogenesis imperfecta journal June 2019

Similar Records

Identification of major matrix metalloproteinase-20 proteolytic processing products of murine amelogenin and tyrosine-rich amelogenin peptide using a nuclear magnetic resonance spectroscopy based method
Journal Article · Fri Jun 01 00:00:00 EDT 2018 · Archives of Oral Biology · OSTI ID:1441208

A Solution NMR Investigation into the Murine Amelogenin Splice-Variant LRAP (Leucine-Rich Amelogenin Protein).
Journal Article · Wed Sep 01 00:00:00 EDT 2010 · Biochimica et Biophysica Acta--Proteins and Proteomics, 1804(9):1768-1774 · OSTI ID:988613

A Solution NMR Investigation into the Early Events of Amelogenin Nanosphere Self-Assembly Initiated with Sodium Chloride or Calcium Chloride
Journal Article · Sun Dec 07 23:00:00 EST 2008 · Biochemistry, 47(50):13215-13222 · OSTI ID:946346