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PET ((Prickle Espinas Testin) domain is involved in protein-protein interactions. PET domain is involved in protein-protein interactions and is usually found in conjunction with LIM domain, which is also a protein-protein interaction domain. The PET containing proteins serve as adaptors or scaffolds to support the assembly of multimeric protein complexes. The PET domain has been found at the N-terminal of four known groups of proteins: prickle, testin, LIMPETin/LIM-9 and overexpressed breast tumor protein (OEBT). Prickle has been implicated in regulation of cell movement through its association with the Dishevelled (Dsh) protein in the planar cell polarity (PCP) pathway. Testin is a cytoskeleton associated focal adhesion protein that localizes along actin stress fibers, at cell contact areas, and at focal adhesion plaques. It interacts with a variety of cytoskeletal proteins, including zyxin, mena, VASP, talin, and actin, and is involved in cell motility and adhesion events. Knockout mice experiments reveal tumor repressor function of Testin. LIMPETin/LIM-9 contains an N-terminal PET domain and 6 LIM domains at the C-terminal. In Schistosoma mansoni, where LIMPETin was first identified, it is down regulated in sexually mature adult females compared to sexually immature adult females and adult males. Its differential expression indicates that it is a transcription regulator. In C. elegans, LIM-9 may play a role in regulating the assembly and maintenance of the muscle A-band by forming a protein complex with SCPL-1 and UNC-89 and other proteins. OEBT displays a PET domain with two LIM domains, and is predicted to be localized in the nucleus with a possible role in cancer differentiation. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",