Translocated intimin receptor Tir - B7UM99 (TIR_ECO27)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for B7UM99: 2
Multifunctional protein that is required for efficient pedestal formation in host epithelial cells during infection. The extracellular region acts as a receptor for bacterial intimin, allowing the bacterium to attach tightly to the host-cell surface. Simultaneously, the intracellular region initiates a signaling cascade in the host cell, which leads to actin polymerization and formation of actin pedestals at the sites of bacterial adhesion. In strain E2348/69, acts mainly via the host adaptor proteins NCK1 and NCK2. Once clustered and phosphorylated at Tyr-474, Tir binds to NCK proteins, which in turn bind and activate host WASL/N-WASP, leading to actin polymerization. Can also trigger an inefficient, NCK-independent pedestal formation. This pathway involves phosphorylation of Tyr-454 and probably a putative host adaptor. Acts also via direct binding to the host cytoskeletal protein alpha-actinin in a NCK- and phosphotyrosine-independent manner. This interaction may stabilize the pedestal, but is not essential for its formation. UniProt
Pathway Maps
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Subunit Structure
Interacts with intimin. Interacts with host proteins NCK1, NCK2, alpha-actinin and BAIAP2. UniProt
The intracellular N-terminal region interacts with host alpha-actinin and is not required for pedestal formation. The central extracellular region (amino acids 277-332) is involved in bacterial intimin binding. The intracellular C-terminal region binds to host NCK. UniProt
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