P62138 (PP1A_RAT) Reviewed, UniProtKB/Swiss-Prot
Last modified November 13, 2013. Version 91. History...
Names and origin
|Protein names||Recommended name:|
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit
|Organism||Rattus norvegicus (Rat) [Reference proteome]|
|Taxonomic identifier||10116 [NCBI]|
|Taxonomic lineage||Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Glires › Rodentia › Sciurognathi › Muroidea › Muridae › Murinae › Rattus|
|Sequence length||330 AA.|
|Sequence processing||The displayed sequence is further processed into a mature form.|
|Protein existence||Evidence at protein level|
General annotation (Comments)
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 Ca2+/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 By similarity.
A phosphoprotein + H2O = a protein + phosphate.
Binds 1 iron ion per subunit By similarity.
Binds 1 manganese ion per subunit By similarity.
PP1 comprises a catalytic subunit, PPP1CA, PPP1CB or PPP1CC, which is folded into its native form by inhibitor 2 and glycogen synthetase kinase 3, and then complexed to one or several targeting or regulatory subunits. PPP1R12A, PPP1R12B and PPP1R12C mediate binding to myosin. PPP1R3A (in skeletal muscle), PPP1R3B (in liver), PPP1R3C, PPP1R3D and PPP1R3F (in brain) mediate binding to glycogen. Interacts with PPP1R15A and PPP1R15B; the interactions mediate binding to EIF2S1. Part of a complex containing PPP1R15B, PP1 and NCK1/2. Component of the MLL5-L complex, at least composed of KMT2E/MLL5, STK38, PPP1CA, PPP1CB, PPP1CC, HCFC1, ACTB and OGT. Interacts with PPP1R7. Forms a complex with ILF2, ILF3, YLPM1, KHDRBS1, RBMX and NCOA5. Interacts with NOM1 and PPP1R8. Interacts with PPP1R16B. Interacts with RPSA only in the presence of PPP1R16B. Component of the PTW/PP1 phosphatase complex, composed of PPP1R10/PNUTS, TOX4, WDR82, and PPP1CA or PPP1CB or PPP1CC. Interacts with PPP1R10/PNUTS and PPP1R8. Interacts with WDR82 in the presence of PPP1R10/PNUTS. Interacts with PPP1R39. Interacts with TRIM28; the interaction dephosphorylates TRIM28 on 'Ser-824' and forms a complex at the p21 promoter site By similarity. Interacts with PPP1R9A, PPP1R9B and YLPM1. Interacts with NEK2. Interacts with PHACTR4; which acts as an activator of PP1 activity. Interacts with FER; this promotes phosphorylation at Thr-320 By similarity. Ref.5 Ref.7
Cytoplasm By similarity. Nucleus By similarity. Nucleus › nucleoplasm By similarity. Nucleus › nucleolus By similarity. Note: Primarily nuclear and largely excluded from the nucleolus. Highly mobile in cells and can be relocalized through interaction with targeting subunits. NOM1 plays a role in targeting it to the nucleolus. In the presence of PPP1R8 relocalizes from the nucleus to nuclear speckles By similarity.
Widely expressed. Ref.3
Phosphorylated. Dephosphorylated at Thr-320 in the presence of ionizing radiation By similarity.
Sequence annotation (Features)
|Feature key||Position(s)||Length||Description||Graphical view||Feature identifier|
|Initiator methionine||1||1||Removed By similarity|
|Chain||2 – 330||329||Serine/threonine-protein phosphatase PP1-alpha catalytic subunit||PRO_0000058777|
|Active site||125||1||Proton donor By similarity|
|Metal binding||64||1||Iron By similarity|
|Metal binding||66||1||Iron By similarity|
|Metal binding||92||1||Iron By similarity|
|Metal binding||92||1||Manganese By similarity|
|Metal binding||124||1||Manganese By similarity|
|Metal binding||173||1||Manganese By similarity|
|Metal binding||248||1||Manganese By similarity|
Amino acid modifications
|Modified residue||2||1||N-acetylserine By similarity|
|Modified residue||306||1||Phosphotyrosine By similarity|
|Modified residue||320||1||Phosphothreonine By similarity|
|||"Molecular cloning and sequence analysis of cDNA for the catalytic subunit 1 alpha of rat kidney type 1 protein phosphatase, and detection of the gene expression at high levels in hepatoma cells and regenerating livers as compared to rat livers."|
Kitamura K., Mizuno Y., Sasaki A., Yasui A., Tsuiki S., Kikuchi K.
J. Biochem. 109:307-310(1991) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [MRNA].
|||"Identification of members of the protein phosphatase 1 gene family in the rat and enhanced expression of protein phosphatase 1 alpha gene in rat hepatocellular carcinomas."|
Sasaki K., Shima H., Kitagawa Y., Irino S., Sugimura T., Nagao M.
Jpn. J. Cancer Res. 81:1272-1280(1990) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [MRNA].
|||"Differential expression of protein phosphatase 1 isoforms in mammalian brain."|
da Cruz e Silva E.F., Fox C.A., Ouimet C.C., Gustafson E., Watson S.J., Greengard P.
J. Neurosci. 15:3375-3389(1995) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [MRNA], TISSUE SPECIFICITY.
|||"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)."|
The MGC Project Team
Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA].
|||"Regulation of neurabin I interaction with protein phosphatase 1 by phosphorylation."|
McAvoy T., Allen P.B., Obaishi H., Nakanishi H., Takai Y., Greengard P., Nairn A.C., Hemmings H.C. Jr.
Biochemistry 38:12943-12949(1999) [PubMed] [Europe PMC] [Abstract]
Cited for: PROTEIN SEQUENCE OF 7-26 AND 212-234, INTERACTION WITH PPP1R9A AND PPP1R9B.
|||Lubec G., Afjehi-Sadat L.|
Submitted (NOV-2006) to UniProtKB
Cited for: PROTEIN SEQUENCE OF 44-60 AND 112-122, MASS SPECTROMETRY.
Tissue: Spinal cord.
|||"The nuclear PP1 interacting protein ZAP3 (ZAP) is a putative nucleoside kinase that complexes with SAM68, CIA, NF110/45, and HNRNP-G."|
Ulke-Lemee A., Trinkle-Mulcahy L., Chaulk S., Bernstein N.K., Morrice N., Glover M., Lamond A.I., Moorhead G.B.G.
Biochim. Biophys. Acta 1774:1339-1350(2007) [PubMed] [Europe PMC] [Abstract]
Cited for: INTERACTION WITH YLPM1.
|+||Additional computationally mapped references.|
|Protein Spotlight |
The things we forget - Issue 32 of March 2003
|D00859 mRNA. Translation: BAA00732.1.|
D90163 mRNA. Translation: BAA14194.1.
BC070517 mRNA. Translation: AAH70517.1.
|RefSeq||NP_113715.1. NM_031527.1. |
3D structure databases
|SMR||P62138. Positions 7-299. |
Protein-protein interaction databases
|IntAct||P62138. 1 interaction.|
Protocols and materials databases
Genome annotation databases
|Ensembl||ENSRNOT00000025282; ENSRNOP00000025282; ENSRNOG00000018708. |
|UCSC||RGD:3375. rat. |
|RGD||3375. Ppp1ca. |
Enzyme and pathway databases
|Reactome||REACT_113568. Metabolism. |
Gene expression databases
Family and domain databases
|InterPro||IPR004843. PEstase_dom. |
|Pfam||PF00149. Metallophos. 1 hit. |
|PRINTS||PR00114. STPHPHTASE. |
|SMART||SM00156. PP2Ac. 1 hit. |
|PROSITE||PS00125. SER_THR_PHOSPHATASE. 1 hit. |
|Accession||Primary (citable) accession number: P62138|
Secondary accession number(s): P08129, P20653, P22802
|Entry status||Reviewed (UniProtKB/Swiss-Prot)|
|Annotation program||Chordata Protein Annotation Program|