3dw8 | pdb_00003dw8

Structure of a Protein Phosphatase 2A Holoenzyme with B55 subunit

spinqualitylabelsall models 3dw8, resolution 2.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3dw8 is a 8 chain structure with sequence from Cyanobacteria and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.85Å Ligands: 1ZN, ACB, DAL, DAM, FGA, MN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function 2AAA_HUMAN The PR65 subunit of protein phosphatase 2A serves as a scaffolding molecule to coordinate the assembly of the catalytic subunit and a variable regulatory B subunit. Required for proper chromosome segregation and for centromeric localization of SGOL1 in mitosis. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Protein phosphatase 2A (PP2A) regulates many essential aspects of cellular physiology. Members of the regulatory B/B55/PR55 family are thought to play a key role in the dephosphorylation of Tau, whose hyperphosphorylation contributes to Alzheimer's disease. The underlying mechanisms of the PP2A-Tau connection remain largely enigmatic. Here, we report the complete reconstitution of a Tau dephosphorylation assay and the crystal structure of a heterotrimeric PP2A holoenzyme involving the regulatory subunit Balpha. We show that Balpha specifically and markedly facilitates dephosphorylation of the phosphorylated Tau in our reconstituted assay. The Balpha subunit comprises a seven-bladed beta propeller, with an acidic, substrate-binding groove located in the center of the propeller. The beta propeller latches onto the ridge of the PP2A scaffold subunit with the help of a protruding beta hairpin arm. Structure-guided mutagenesis studies revealed the underpinnings of PP2A-mediated dephosphorylation of Tau. Structure of a protein phosphatase 2A holoenzyme: insights into B55-mediated Tau dephosphorylation.,Xu Y, Chen Y, Zhang P, Jeffrey PD, Shi Y Mol Cell. 2008 Sep 26;31(6):873-85. PMID:18922469 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Protein phosphatase 3D structures

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