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ITPK3

Gene
ITPK3
Protein
Inositol-tetrakisphosphate 1-kinase 3
Organism
Oryza sativa subsp. indica
Length
357 amino acids
Function
Kinase that can phosphorylate various inositol polyphosphate such as Ins(3,4,5,6)P4 or Ins(1,3,4)P3 and participates in phytic acid biosynthesis in developing seeds. Phytic acid is the primary storage form of phosphorus in cereal grains and other plant seeds.
Similarity
Belongs to the ITPK1 family.
Mass
39.409 kDa
Sequence
MVSGGRVGGGEGEAGEAAEVAVAMVDNEEEVAQAQAPPAAAVAARELVVGYALTSKKAKSFLQPKLRGLARKKGILFVAIDQKRPLSDQGPFDIVLHKLTGREWQQLLEEYREEHPEVTVLDPPGAIEHLLNRQSMLQEVSELDLSDCHGRVGVPKQLFVNTDPSSIPAAVMRAGLSLPLVAKPLVAKSHELSLAYDPISLTKLEPPLVLQEFVNHGGVLFKVYIVGDAIRVVRRFSLPNVDVGDLSNNAGVFRFPRVSCASANADDADLDPHVAELPPRPLLEILARELRRRLGLRLFNIDMIREHGTRDRFYVIDMNYFPGYGKMPGYEHVFTDFLLSLVQKEYKRRPSYSSCEG

Gene
ITPK3
Protein
Inositol-tetrakisphosphate 1-kinase 3
Organism
Arabidopsis thaliana
Length
353 amino acids
Function
Kinase that can phosphorylate various inositol polyphosphate such as Ins(3,4,5,6)P4 or Ins(1,3,4)P3. Phosphorylates Ins(3,4,5,6)P4 to form InsP5 (PubMed:17698066). This reaction is thought to have regulatory importance, since Ins(3,4,5,6)P4 is an inhibitor of plasma membrane Ca(2+)-activated Cl(-) channels, while Ins(1,3,4,5,6)P5 is not (By similarity). Also phosphorylates Ins(1,3,4)P3 or a racemic mixture of Ins(1,4,6)P3 and Ins(3,4,6)P3 to form InsP4 (PubMed:17698066). Ins(1,3,4,6)P4 is an essential molecule in the hexakisphosphate (InsP6) pathway (By similarity).
Similarity
Belongs to the ITPK1 family.
Mass
39.631 kDa
Sequence
MKLTDNEEITMNGTREMETTEQETSSPCSLVIEAFPVKKSIIVGYALTSKKIKSFLQPKLEGLARNKGILFVAIDQNKPLSEQGPFDIVLHKQIGKEWRRILEEFRLAHPDVTVLDPPDAILHLRNRQSMLQCVADMNLSDSNGRVGVPKQLVIKKDASSIPEAVNNAGLRLPLVAKPLVADGSAKSHELSLAYDQHSLLKLEPPLVLQEFVNHGGVLFKVYIVGEAIRVVRRFSLPDVSRRELPKSAGVFRFPRVSCAAASADDADLDPSIAELPPRPLLERLAKELRRGLGLRLFNLDIIREHGTRDRFYVIDINYFPGYGKMPEYEHVFTDFLLSVVQSQCKKRALADQY