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SIT4 protein (Saccharomyces cerevisiae) - STRING interaction network
"SIT4" - Type 2A-related serine-threonine phosphatase that functions in the G1/S transition of the mitotic cycle in Saccharomyces cerevisiae
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Predicted Interactions
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SIT4Type 2A-related serine-threonine phosphatase that functions in the G1/S transition of the mitotic cycle; cytoplasmic and nuclear protein that modulates functions mediated by Pkc1p including cell wall and actin cytoskeleton organization; Involved in the dephosphorylation of the large subunit of RNA polymerase II. Is required in late G1 for normal G1 cyclin expression, bud initiation and expression of certain genes that are periodically expressed during late G1. Associates with the SAP proteins in a cell cycle-dependent manner (311 aa)    
Predicted Functional Partners:
TAP42
Essential protein involved in the TOR signaling pathway; physically associates with the protein phosphatase 2A and the SIT4 protein phosphatase catalytic subunits; Involved in negative regulation of the TOR signaling pathway in response to type of available nitrogen source. Inhibitor of PP2A phosphatase SIT4, which results in inhibition of nuclear export of MSN2, due to lack of dephosphorylation by SIT4. Also required for rapamycin induced activation of expression of many nitrogen discrimination pathway (NDP) genes. In complex with PPH21, required for organization of the actin cytoskel [...] (366 aa)
     
 
  0.999
TPD3
Regulatory subunit A of the heterotrimeric protein phosphatase 2A (PP2A), which also contains regulatory subunit Cdc55p and either catalytic subunit Pph21p or Pph22p; required for cell morphogenesis and transcription by RNA polymerase III; Phosphatase 2A affects a variety of biological processes in the cell such as transcription, cell cycle progression and cellular morphogenesis, and provides an initial identification of critical substrates for this phosphatase. The regulatory subunit may direct the catalytic subunit to distinct, albeit overlapping, subsets of substrates (635 aa)
     
  0.999
CDC55
Non-essential regulatory subunit B of protein phosphatase 2A (PP2A); localization to cytoplasm requires Zds1p and Zds2p and promotes mitotic entry; localization to nucleus prevents mitotic exit; required for correct nuclear division and chromosome segregation in meiosis; maintains nucleolar sequestration of Cdc14p during early meiosis; limits formation of PP2A-Rts1p holocomplexes to ensure timely dissolution of sister chromosome cohesion; homolog of mammalian B55; Phosphatase 2A affects a variety of biological processes in the cell such as transcription, cell cycle progression and cell [...] (526 aa)
     
  0.997
RRD1
Peptidyl-prolyl cis/trans-isomerase; activator of the phosphotyrosyl phosphatase activity of PP2A; involved in G1 phase progression, microtubule dynamics, bud morphogenesis and DNA repair; required for rapid reduction of Sgs1p levels in response to /.../cin; subunit of the Tap42p-Sit4p-Rrd1p complex; PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Acts as a regulatory subunit for TAP42-associated PP2A-like phosphatases modulating their activity or substrate specificity, probably by inducing a confor [...] (393 aa)
     
  0.996
RRD2
Activator of the phosphotyrosyl phosphatase activity of PP2A,peptidyl-prolyl cis/trans-isomerase; regulates G1 phase progression, the osmoresponse, microtubule dynamics; subunit of the Tap42p-Pph21p-Rrd2p complex; PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Acts as a regulatory subunit for TAP42-associated PP2A-like phosphatases modulating their activity or substrate specificity, probably by inducing a conformational change in the catalytic subunit, a direct target of the PPIase. Can reactivate i [...] (358 aa)
     
  0.996
SAP185
Protein that forms a complex with the Sit4p protein phosphatase and is required for its function; member of a family of similar proteins including Sap4p, Sap155p, and Sap190p; Associates with the SIT4 phosphatase in a cell cycle dependent manner. May be directly or indirectly involved in SIT4- dependent functions in budding and in normal G1 cyclin expression (1058 aa)
       
 
  0.994
SAP190
Protein that forms a complex with the Sit4p protein phosphatase and is required for its function; member of a family of similar proteins including Sap4p, Sap155p, and Sap185p; Positive regulator of protein phosphatase SIT4. Involved in the general amino acid control (GAAC) response regulated by TOR. Involved in the dephosphorylation of the elongator complex subunit IKI3 (1033 aa)
       
 
  0.993
SAP155
Protein that forms a complex with the Sit4p protein phosphatase and is required for its function; member of a family of similar proteins including Sap4p, Sap185p, and Sap190p; Positive regulator of protein phosphatase SIT4. Involved in directing expression of TOR-repressed genes and in dephosphorylation of NPR1 in response to nutrient starvation. Negatively modulates K(+) efflux of the cell by the Na(+)- K(+)/H(+) antiporter NHA1 (1002 aa)
       
 
  0.991
RTS1
B-type regulatory subunit of protein phosphatase 2A (PP2A); Rts1p and Cdc55p are alternative regulatory subunits for PP2A; PP2A-Rts1p protects cohesin when recruited by Sgo1p to the pericentromere; highly enriched at centromeres in absence of Cdc55p /.../log of the mammalian B’ subunit of PP2A; The B regulatory subunit might modulate substrate selectivity and catalytic activity, and also might direct the localization of the catalytic enzyme to a particular subcellular compartment (757 aa)
     
  0.981
CNB1
Calcineurin B; the regulatory subunit of calcineurin, a Ca++/calmodulin-regulated type 2B protein phosphatase which regulates Crz1p (a stress-response transcription factor), the other calcineurin subunit is encoded by CNA1 and/or CMP1; Regulatory subunit of calcineurin, a calcium-dependent, calmodulin stimulated protein phosphatase. Confers calcium sensitivity (175 aa)
     
  0.980
Your Current Organism:
Saccharomyces cerevisiae
NCBI taxonomy Id: 4932
Other names: Candida robusta, Pachytichospora, S. cerevisiae, Saccharomyces, Saccharomyces capensis, Saccharomyces cerevisiae, Saccharomyces italicus, Saccharomyces oviformis, Saccharomyces uvarum var. melibiosus, lager beer yeast, yeast
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