7aal | pdb_00007aal
Crystal structure of the F-BAR domain of PSTIPIP1, G258A mutant
Structural highlights
DiseasePPIP1_HUMAN Defects in PSTPIP1 are the cause of PAPA syndrome (PAPAS) [MIM:604416; also known as pyogenic sterile arthritis, pyoderma gangrenosum and acne or familial recurrent arthritis (FRA). PAPAS is characterized by autosomal dominant inheritance of early onset, primarily affecting skin and joint tissues. Recurring inflammatory episodes lead to accumulation of sterile, pyogenic, neutrophil-rich material within the affected joints, ultimately resulting in significant destruction.[1] [2] FunctionPPIP1_HUMAN Involved in regulation of the actin cytoskeleton. May regulate the WAS actin-bundling activity. Bridges the interaction between ABL1 and PTPN18 leading to the ABL1 dephosphorylation. May play a role as a scaffold protein between PTPN12 and WAS and allows PTPN12 to dephosphorylate WAS. Has the potential to physically couple CD2 and CD2AP to WAS. Acts downstream of CD2 and CD2AP to recruit WAS to the T-cell:APC contact site so as to promote the actin polymerization required for synapse induction during T-cell activation (By similarity). Down-regulates CD2-stimulated adhesion through the coupling of PTPN12 to CD2.[3] Publication Abstract from PubMedMutations in the adaptor protein PSTPIP1 cause a spectrum of autoinflammatory diseases, including PAPA and PAMI; however, the mechanism underlying these diseases remains unknown. Most of these mutations lie in PSTPIP1 F-BAR domain, which binds to LYP, a protein tyrosine phosphatase associated with arthritis and lupus. To shed light on the mechanism by which these mutations generate autoinflammatory disorders, we solved the structure of the F-BAR domain of PSTPIP1 alone and bound to the C-terminal homology segment of LYP, revealing a novel mechanism of recognition of Pro-rich motifs by proteins in which a single LYP molecule binds to the PSTPIP1 F-BAR dimer. The residues R228, D246, E250, and E257 of PSTPIP1 that are mutated in immunological diseases directly interact with LYP. These findings link the disruption of the PSTPIP1/LYP interaction to these diseases, and support a critical role for LYP phosphatase in their pathogenesis. PSTPIP1-LYP phosphatase interaction: structural basis and implications for autoinflammatory disorders.,Manso JA, Marcos T, Ruiz-Martin V, Casas J, Alcon P, Sanchez Crespo M, Bayon Y, de Pereda JM, Alonso A Cell Mol Life Sci. 2022 Feb 12;79(2):131. doi: 10.1007/s00018-022-04173-w. PMID:35152348[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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