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Conformation and Domain Movement Analysis of Human Matrix Metalloproteinase-2: Role of Associated Zn2+ and Ca2+ Ions

1
Department of Neurosurgery, Mayo Clinic Health System-Franciscan Healthcare, La Crosse, WI 54601 USA
2
Department of Biomedical Sciences, Creighton University, Omaha, NE 68178, USA
3
Department of Neurologic Surgery, Mayo Clinic, Rochester, MN 55905, USA
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(17), 4194; https://doi.org/10.3390/ijms20174194
Received: 3 July 2019 / Revised: 20 August 2019 / Accepted: 26 August 2019 / Published: 27 August 2019
(This article belongs to the Section Molecular Biophysics)
Matrix metaloproteinase-2 (MMP-2) is an extracellular Zn2+ protease specific to type I and IV collagens. Its expression is associated with several inflammatory, degenerative, and malignant diseases. Conformational properties, domain movements, and interactions between MMP-2 and its associated metal ions were characterized using a 1.0 µs molecular dynamics simulation. Dihedral principle component analysis revealed ten families of conformations with the greatest degree of variability occurring in the link region connecting the catalytic and hemopexin domains. Dynamic cross-correlation analysis indicated domain movements corresponding to the opening and closing of the hemopexin domain in relation to the fibronectin and catalytic domains facilitated by the link region. Interaction energies were calculated using the molecular mechanics Poisson Boltzman surface area-interaction entropy (MMPBSA-IE) analysis method and revealed strong binding energies for the catalytic Zn2+ ion 1, Ca2+ ion 1, and Ca2+ ion 3 with significant conformational stability at the binding sites of Zn2+ ion 1 and Ca2+ ion 1. Ca2+ ion 2 diffuses freely away from its crystallographically defined binding site. Zn2+ ion 2 plays a minor role in conformational stability of the catalytic domain while Ca2+ ion 3 is strongly attracted to the highly electronegative sidechains of the Asp residues around the central β-sheet core of the hemopexin domain; however, the interacting residue sidechain carboxyl groups are outside of Ca2+ ion 3′s coordination sphere. View Full-Text
Keywords: molecular dynamics; matrix metalloproteinase; domain movement; zinc binding protein; calcium binding protein molecular dynamics; matrix metalloproteinase; domain movement; zinc binding protein; calcium binding protein
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MDPI and ACS Style

Voit-Ostricki, L.; Lovas, S.; Watts, C.R. Conformation and Domain Movement Analysis of Human Matrix Metalloproteinase-2: Role of Associated Zn2+ and Ca2+ Ions. Int. J. Mol. Sci. 2019, 20, 4194.

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