Protein
Phosphatidylinositol 4-kinase beta 1
Organism
Arabidopsis thaliana
Function
Acts on phosphatidylinositol (PtdIns) in the first committed step in the production of the second messenger inositol-1,4,5-trisphosphate. Necessary for proper organization of the trans-Golgi network (TGN) and post-Golgi secretion in root hairs. Together with PI4KB2, required during polarized root hair expansion and pollen tube elongation. Functions redundantly with PI4KB2 upstream of the cold response phosphoinositide-dependent phospholipase C (PI-PLC) pathway.
Similarity
Belongs to the PI3/PI4-kinase family. Type III PI4K subfamily.
Sequence
MPMGRFLSLVRGDSAESPREITSQSNIIGDTGSNGWLIRFFDSAFFCEWIAVSYLYKHPHAGVRDYLCNRMYTLPLSGIESYLFQICYMMVHKPSPSLDKFVIDICGKSLKIALKVHWFLLAELEDADDNEGISRIQEKCQIAATLMGEWSPLMRPQNEVSTPGSKNQVLNRLLSSKQKLFSLKLSPPTQKSLSFSPSPGTNVQDDGSQLPAEDNKIFKKLIPSPKVRDALMFRKSADKDDEESEKEGFFKRLLRDSKGEGDEPIPNSEGFFKRLLKDNKSEDEDITNSSEGFFKRLLSSKGESEELTSSSDGLFKRLLRDNKGDEEELGANSDSFFKRLLRESKNEDEESNPNSEGFFKKLFRDSKPEDDKVPKEVDDEDKDGFLKKLFREKNDDKRHGSEKNEANGTVYADKKSGEEDEREGFFKKFFKEKSDDKKDIVKVDDGNESEGDESPEFSLFKRLFRIHPEDAKPTSENENSSNGLVESSPGTENFFRKLFRDRDQSVEDSELFGSKKHKEKRPGSPKQRDDTPSGKPPLPNNTASQFRKGAYHESLEFVQALCETSYGLVDIFPIEDRKIGLRESLAEINFHLSEAEITGGICFPMGRGVFRVVHIPEDECILLNSREKAPYMISVEVLKAETPSAKESSNSQKLSKGGIPLANGDAFLQKPPPWAYPLWTTQEVYRNSADRMSLSTAQAIDQAMTPKSEVKVKLVNVSLSVEDRTSALESFGDPIDDVLGEAPRTGLNNDLEWVRVVVTADPGLRMESIPDPSVPRKKEHRRVPSTVAMEEVRAAAAKGEAPPGLPLKGAGQDSSDAQPRANGGMLKEGDALSGELWEGKRDRIRKASIYGKLPGWDLRSIIVKSGDDCRQEHLAVQLISHFYDIFQEAGLPLWLRPYEVLVTSSYTALIETIPDTASIHSIKSRYPNITSLRDFFVAKYKENSPSFKLAQRNFVESMAGYSLVCYLLQVKDRHNGNLLLDEEGHIIHIDFGFMLSNSPGGVNFESAPFKLTRELLEVMDSDADGVPSEFFDYFKVLCIQGFLTCRKHAERIILLVEMLQDSGFPCFKGGPRTIQNLRKRFHLSLTEEQCVSLVLSLISSSLDAWRTRQYDYYQRVLNGIL