Evidence for multisite ligand binding and stretching of filamin by integrin and migfilin.
Evidence for multisite ligand binding and stretching of filamin by integrin and migfilin.
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DOI:
10.1021/bi2003229
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发表时间:
2011-05-24
期刊:
影响因子:
2.9
通讯作者:
Qin, Jun
中科院分区:
文献类型:
--
作者:
Ithychanda, Sujay Subbayya;Qin, Jun
Filamin, a large cytoskeletal adaptor, connects plasma membrane to cytoskeleton by binding to transmembrane receptor integrin and actin. Seven of twenty-four filamin immunoglobulin repeats have conserved integrin binding sites, of which 19 and 21 were shown to be auto-inhibited by their adjacent repeats 18 and 20 respectively. Here we show using NMR spectroscopy that the auto-inhibition can be relieved by integrin or an integrin regulator migfilin. We further demonstrate that repeats 19 and 21 can simultaneously engage ligands. The data suggest that filamin is mechanically stretched by integrin or migfilin via a multi-site binding mechanism for regulating cytoskeleton and integrin-mediated cell adhesion.
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