Structural basis for complex formation between human IRSp53 and the translocated intimin receptor Tir of enterohemorrhagic E. coli.

Structural basis for complex formation between human IRSp53 and the translocated intimin receptor Tir of enterohemorrhagic E. coli.
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DOI:
10.1016/j.str.2011.06.015
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发表时间:
2011-09-07
期刊:
影响因子:
5.7
通讯作者:
Stradal, Theresia E. B.
Stradal, Theresia E. B.
中科院分区:
生物学2区
文献类型:
--
作者:
de Groot, Jens C.;Schlueter, Kai;Carius, Yvonne;Quedenau, Claudia;Vingadassalom, Didier;Faix, Jan;Weiss, Stefanie M.;Reichelt, Joachim;Standfuss-Gabisch, Christine;Lesser, Cammie F.;Leong, John M.;Heinz, Dirk W.;Buessow, Konrad;Stradal, Theresia E. B.

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Actin assembly beneath enterohemorrhagic E. coli (EHEC) attached to its host cell is triggered by the intracellular interaction of its translocated effector proteins Tir and EspFU with human IRSp53 family proteins and N-WASP. Here, we report the structure of the N-terminal I-BAR domain of IRSp53 in complex with a Tir-derived peptide, in which the homodimeric I-BAR domain binds two Tir molecules aligned in parallel. This arrangement provides a protein scaffold linking the bacterium to the host cell's actin polymerization machinery. The structure uncovers a specific peptide-binding site on the I-BAR surface, conserved between IRSp53 and IRTKS. The Tir Asn-Pro-Tyr (NPY) motif, essential for pedestal formation, is specifically recognized by this binding site. The site was confirmed by mutagenesis and in vivo-binding assays. It is possible that IRSp53 utilizes the NPY-binding site for additional interactions with as yet unknown partners within the host cell.
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