Ambidextrous binding of cell and membrane bilayers by soluble matrix metalloproteinase-12.

Ambidextrous binding of cell and membrane bilayers by soluble matrix metalloproteinase-12.
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DOI:
10.1038/ncomms6552
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发表时间:
2014-11-21
影响因子:
16.6
通讯作者:
Van Doren, Steven R.
Van Doren, Steven R.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Koppisetti, Rama K.;Fulcher, Yan G.;Jurkevich, Alexander;Prior, Stephen H.;Xu, Jia;Lenoir, Marc;Overduin, Michael;Van Doren, Steven R.

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Matrix metalloproteinases (MMPs) regulate tissue remodeling, inflammation, and disease progression. Some soluble MMPs are inexplicably active near cell surfaces. Here, we demonstrate binding of MMP-12 directly to bilayers and cellular membranes using paramagnetic NMR and fluorescence. Opposing sides of the catalytic domain engage spin-labeled membrane mimics. Loops project from the β-sheet interface to contact the phospholipid bilayer with basic and hydrophobic residues. The distal membrane interface comprises loops on the other side of the catalytic cleft. Both interfaces mediate MMP-12 association with vesicles and cell membranes. MMP-12 binds plasma membranes and is internalized to hydrophobic perinuclear features, the nuclear membrane, and inside the nucleus within minutes. While binding of TIMP-2 to MMP-12 hinders membrane interactions beside the active site, TIMP-2-inhibited MMP-12 binds vesicles and cells, suggesting compensatory rotation of its membrane approaches. MMP-12 association with diverse cell membranes may target its activities to modulate innate immune responses and inflammation.
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