The N-Terminal Region of Fibrillin-1 Mediates a Bipartite Interaction with LTBP1.
The N-Terminal Region of Fibrillin-1 Mediates a Bipartite Interaction with LTBP1.
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DOI:
10.1016/j.str.2017.06.003
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发表时间:
2017-08-01
期刊:
影响因子:
--
通讯作者:
Handford PA
中科院分区:
文献类型:
--
作者:
Robertson IB;Dias HF;Osuch IH;Lowe ED;Jensen SA;Redfield C;Handford PA
Fibrillin-1 (FBN1) mutations associated with Marfan syndrome lead to an increase in transforming growth factor β (TGF-β) activation in connective tissues resulting in pathogenic changes including aortic dilatation and dissection. Since FBN1 binds latent TGF-β binding proteins (LTBPs), the major reservoir of TGF-β in the extracellular matrix (ECM), we investigated the structural basis for the FBN1/LTBP1 interaction. We present the structure of a four-domain FBN1 fragment, EGF2-EGF3-Hyb1-cbEGF1 (FBN1E2cbEGF1), which reveals a near-linear domain organization. Binding studies demonstrate a bipartite interaction between a C-terminal LTBP1 fragment and FBN1E2cbEGF1, which lies adjacent to the latency-associated propeptide (LAP)/TGF-β binding site of LTBP1. Modeling of the binding interface suggests that, rather than interacting along the longitudinal axis, LTBP1 anchors itself to FBN1 using two independent epitopes. As part of this mechanism, a flexible pivot adjacent to the FBN1/LTBP1 binding site allows LTBP1 to make contacts with different ECM networks while presumably facilitating a force-induced/traction-based TGF-β activation mechanism. The structure of the FBN1 N-terminal region shows a near-linear domain organization LTBP1 binds to FBN1 via a bipartite mode of interaction involving two discreet sites This allows LTBP1 to connect 10–12 nm FBN1 microfibrils to other ECM networks This may facilitate force-induced/traction-based activation of TGF-β via integrins Improving our knowledge of TGF-β regulation by matrix biomechanics is vital for understanding the biology of this enigmatic growth factor. Robertson et al. present a bipartite model for the structure of the fibrillin-1-LTBP1 interaction that functions as a holdfast for TGF-β in the matrix.
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DOI:
10.1074/jbc.m113.469841
发表时间:
2013-06-14
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Erat MC;Sladek B;Campbell ID;Vakonakis I
通讯作者:
Vakonakis I
影响因子:
82.9
作者:
Cohn, Ronald D.;van Erp, Christel;Dietz, Harry C.
通讯作者:
Dietz, Harry C.
影响因子:
4.8
作者:
Choudhury, Rawshan;McGovern, Amanda;Ridley, Caroline;Cain, Stuart A.;Baldwin, Andrew;Wang, Ming-Chuan;Guo, Chun;Mironov, Aleksandr, Jr.;Drymoussi, Zoe;Trump, Dorothy;Shuttleworth, Adrian;Baldock, Clair;Kielty, Cay M.
通讯作者:
Kielty, Cay M.
影响因子:
0.9
作者:
Yadin DA;Robertson IB;Jensen SA;Handford PA;Redfield C
通讯作者:
Redfield C
DOI:
10.1126/science.1192152
发表时间:
2011-04-15
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Habashi JP;Doyle JJ;Holm TM;Aziz H;Schoenhoff F;Bedja D;Chen Y;Modiri AN;Judge DP;Dietz HC
通讯作者:
Dietz HC