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Literature summary extracted from

  • Kajikawa, M.; Sawaragi, Y.; Shinkawa, H.; Yamano, T.; Ando, A.; Kato, M.; Hirono, M.; Sato, N.; Fukuzawa, H.
    Algal dual-specificity tyrosine phosphorylation-regulated kinase, triacylglycerol accumulation regulator1, regulates accumulation of triacylglycerol in nitrogen or sulfur deficiency (2015), Plant Physiol., 168, 752-764.
    View publication on PubMedView publication on EuropePMC

Cloned(Commentary)

EC Number Cloned (Comment) Organism
2.7.12.1 gene TAR1, DNA and amino acid sequence determination and analysis, genetic organization Chlamydomonas reinhardtii

Protein Variants

EC Number Protein Variants Comment Organism
2.7.12.1 K523R site.directed mutagenesis, substitution of the putative phosphate anchor Lys, mutant pTAR1KD is catalytically inactive Chlamydomonas reinhardtii
2.7.12.1 additional information AdipoRed fluorescence-activated cell sorting-based screening of low triacylglycerol-accumulating mutants in nutrient (nitrogen and sulfur)-deficient conditions, identification of the TAR1-defective mutant tar1-1 with a DNA tag insertion in the TAR1 locus. the phenotypes of tar1-1 related to triacylglycerol are caused by disruption of the TAR1 gene. The wild-type TAR1 gene restores the low-TAG accumulation phenotype Chlamydomonas reinhardtii

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
2.7.12.1 Mg2+ required Chlamydomonas reinhardtii

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
2.7.12.1 ATP + a protein Chlamydomonas reinhardtii
-
 ADP + a phosphoprotein
-
 ?
2.7.12.1 ATP + a protein Chlamydomonas reinhardtii C-9
-
 ADP + a phosphoprotein
-
 ?

Organism

EC Number Organism UniProt Comment Textmining
2.7.12.1 Chlamydomonas reinhardtii A0A0G4DBZ7
-
-
2.7.12.1 Chlamydomonas reinhardtii C-9 A0A0G4DBZ7
-
-

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2.7.12.1 ATP + a protein
-
 Chlamydomonas reinhardtii ADP + a phosphoprotein
-
 ?
2.7.12.1 ATP + a protein
-
 Chlamydomonas reinhardtii C-9 ADP + a phosphoprotein
-
 ?
2.7.12.1 additional information the kinase domain of TAR1 shows auto- and transphosphorylation activities Chlamydomonas reinhardtii ?
-
 ?
2.7.12.1 additional information the kinase domain of TAR1 shows auto- and transphosphorylation activities Chlamydomonas reinhardtii C-9 ?
-
 ?

Synonyms

EC Number Synonyms Comment Organism
2.7.12.1 dual-specificity tyrosine phosphorylation-regulated kinase
-
 Chlamydomonas reinhardtii
2.7.12.1 GCRFno11_b05 locus name Chlamydomonas reinhardtii
2.7.12.1 TAR1
-
 Chlamydomonas reinhardtii
2.7.12.1 triacylglycerol accumulation regulator1
-
 Chlamydomonas reinhardtii

Cofactor

EC Number Cofactor Comment Organism Structure
2.7.12.1 ATP
-
 Chlamydomonas reinhardtii

General Information

EC Number General Information Comment Organism
2.7.12.1 evolution the enzyme is a member of kinase1 (Yak1) subfamily in the dual-specificity tyrosine phosphorylation-regulated kinase family. The kinase domain of TAR1 also has conserved functional features of the DYRK family, such as an ATP anchor, a phosphate anchor, a catalytic loop, a cation-binding site, and an activation loop Chlamydomonas reinhardtii
2.7.12.1 malfunction the TAR1-defective mutant, tar1-1, accumulates TAG to levels 0.5 and 0.1fold of those of a wild-type strain in sulfur- and nitrogen-deficient conditions, respectively. In N-deficient conditions, tar1-1 shows more pronounced arrest of cell division than the wild-type, has increased cell size and cell dry weight, and maintains chlorophyll and photosynthetic activity, which are not observed in S-deficient conditions. In N-deficient conditions, global changes in expression levels of nitrogen deficiency-responsive genes in nitrogen assimilation and tetrapyrrole metabolism are noted between tar1-1 and wild-type cells. Mutant tar1-1 cells retain their photosynthetic activity in N-deficient conditions. The wild-type TAR1 gene restores the low-TAG accumulation phenotype. Phenotype, overview Chlamydomonas reinhardtii
2.7.12.1 physiological function TAR1 is a regulator of TAG accumulation in S- and N-deficient conditions, and it functions in cell growth and repression of photosynthesis in conditions of nitrogen deficiency. The kinase domain of TAR1 also has conserved functional features of the DYRK family, such as an ATP anchor, a phosphate anchor, a catalytic loop, a cation-binding site, and an activation loop. TAR1 enhances the degradation of chlorophyll and photosynthesis-related proteins, which leads to a decrease of photosynthetic activity in wild-type cells in N-deficient conditions. TAR1 also might enhance acetate assimilation and rate of cell division and prevent increase of cell biomass Chlamydomonas reinhardtii