Structural basis of the filamin A actin-binding domain interaction with F-actin.

Structural basis of the filamin A actin-binding domain interaction with F-actin.
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DOI:
10.1038/s41594-018-0128-3
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发表时间:
2018-10
影响因子:
16.8
通讯作者:
Calderwood DA
Calderwood DA
中科院分区:
生物学1区
文献类型:
--
作者:
Iwamoto DV;Huehn A;Simon B;Huet-Calderwood C;Baldassarre M;Sindelar CV;Calderwood DA

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Actin-crosslinking proteins assemble actin filaments into higher-order structures essential for orchestrating cell shape, adhesion and motility. Missense mutations in the tandem calponin homology (CH) domains of their actin-binding domains (ABDs) underlie numerous genetic diseases, but a molecular understanding of these pathologies is hampered by the lack of high-resolution structures of any actin-crosslinking protein bound to F-actin. Here, taking advantage of a high-affinity, disease-associated mutant of the human filamin A (FLNa) ABD, we combine cryo-electron microscopy and functional studies to reveal at near-atomic resolution how the first CH domain (CH1) and residues immediately N-terminal to it engage actin. We further show that reorientation of CH2 relative to CH1 is required to avoid clashes with actin and to expose F-actin-binding residues on CH1. Our data explain localization of disease-associated loss-of-function mutations to FLNaCH1 and gain-of-function mutations to the regulatory FLNaCH2. Sequence conservation argues that this provides a general model for ABD-F-actin binding.
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