5zqv
Crystal Structure of Protein Phosphate 1 complexed with PP1 binding domain of GM
Structural highlights
FunctionPP1A_MOUSE Protein phosphatase that associates with over 200 regulatory proteins to form highly specific holoenzymes which dephosphorylate hundreds of biological targets. Protein phosphatase 1 (PP1) is essential for cell division, and participates in the regulation of glycogen metabolism, muscle contractility and protein synthesis. Involved in regulation of ionic conductances and long-term synaptic plasticity. May play an important role in dephosphorylating substrates such as the postsynaptic density-associated Ca(2+)/calmodulin dependent protein kinase II. Component of the PTW/PP1 phosphatase complex, which plays a role in the control of chromatin structure and cell cycle progression during the transition from mitosis into interphase. Regulates NEK2 function in terms of kinase activity and centrosome number and splitting, both in the presence and absence of radiation-induced DNA damage. Regulator of neural tube and optic fissure closure, and enteric neural crest cell (ENCCs) migration during development. In balance with CSNK1D and CSNK1E, determines the circadian period length, through the regulation of the speed and rhythmicity of PER1 and PER2 phosphorylation. May dephosphorylate CSNK1D and CSNK1E. Dephosphorylates CENPA (By similarity). Dephosphorylates the 'Ser-139' residue of ATG16L1 causing dissociation of ATG12-ATG5-ATG16L1 complex, thereby inhibiting autophagy (By similarity).[UniProtKB:P62136][1] [2] [3] [4] Publication Abstract from PubMedThe rate-limiting enzymes in glycogen metabolism are subject to regulation by reversible phosphorylation. The glycogen-targeted protein phosphatase 1 (PP1) holoenzyme catalyzes their dephosphorylation. It is composed of a catalytic subunit (PP1C) and a glycogen-targeting subunit (G subunit). To date, seven G subunits have been identified. They all contain an RVxF PP1C-binding motif. The interactions between this motif in the skeletal muscle-specific GM and PP1C have been revealed by structural studies. However, whether elements outside of this motif contribute to the interaction with PP1C is not clear. In this study, we found that residues next to the RVxF motif in GM also mediate interactions to PP1C and revealed the mechanism of the interaction by structural studies. Sequence analysis revealed that the PP1C-binding region in GM is highly conserved among G subunits. Consistently, we found that the equivalent region in the liver-enriched GL adopts a similar structure upon binding PP1C. Dephosphorylation experiments indicated that this region and the glycogen-binding region in GM cooperate to stimulate PP1C's activity toward glycogen-associated substrates. DATABASES: The structure factors and coordinates for the PP1Calpha-GM (1-99) and PP1Calpha-GL (31-105) complexes have been deposited into the Protein Data Bank (https://www.pdb.org), with the accession codes 5ZQV and 5ZT0, respectively. Structural basis for protein phosphatase 1 recruitment by glycogen-targeting subunits.,Yu J, Deng T, Xiang S FEBS J. 2018 Dec;285(24):4646-4659. doi: 10.1111/febs.14699. Epub 2018 Nov 28. PMID:30422398[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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