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 PI4KBETA2, required during polarized root hair expansion and pollen tube elongation. Phosphatidylinositol 4-OH kinase beta1 Phosphatidylinositol 4-kinase beta 1 PI4K PI4KBETA1 P4KB1_ARATH 1121 MPMGRFLSLVRGDSAESPREITSQSNIIGDTGSNGWLIRFFDSAFFCEWIAVSYLYKHPHAGVRDYLCNRMYTLPLSGIESYLFQICYMMVHKPSPSLDKFVIDICGKSLKIALKVHWFLLAELEDADDNEGISRIQEKCQIAATLMGEWSPLMRPQNEVSTPGSKNQVLNRLLSSKQKLFSLKLSPPTQKSLSFSPSPGTNVQDDGSQLPAEDNKIFKKLIPSPKVRDALMFRKSADKDDEESEKEGFFKRLLRDSKGEGDEPIPNSEGFFKRLLKDNKSEDEDITNSSEGFFKRLLSSKGESEELTSSSDGLFKRLLRDNKGDEEELGANSDSFFKRLLRESKNEDEESNPNSEGFFKKLFRDSKPEDDKVPKEVDDEDKDGFLKKLFREKNDDKRHGSEKNEANGTVYADKKSGEEDEREGFFKKFFKEKSDDKKDIVKVDDGNESEGDESPEFSLFKRLFRIHPEDAKPTSENENSSNGLVESSPGTENFFRKLFRDRDQSVEDSELFGSKKHKEKRPGSPKQRDDTPSGKPPLPNNTASQFRKGAYHESLEFVQALCETSYGLVDIFPIEDRKIGLRESLAEINFHLSEAEITGGICFPMGRGVFRVVHIPEDECILLNSREKAPYMISVEVLKAETPSAKESSNSQKLSKGGIPLANGDAFLQKPPPWAYPLWTTQEVYRNSADRMSLSTAQAIDQAMTPKSEVKVKLVNVSLSVEDRTSALESFGDPIDDVLGEAPRTGLNNDLEWVRVVVTADPGLRMESIPDPSVPRKKEHRRVPSTVAMEEVRAAAAKGEAPPGLPLKGAGQDSSDAQPRANGGMLKEGDALSGELWEGKRDRIRKASIYGKLPGWDLRSIIVKSGDDCRQEHLAVQLISHFYDIFQEAGLPLWLRPYEVLVTSSYTALIETIPDTASIHSIKSRYPNITSLRDFFVAKYKENSPSFKLAQRNFVESMAGYSLVCYLLQVKDRHNGNLLLDEEGHIIHIDFGFMLSNSPGGVNFESAPFKLTRELLEVMDSDADGVPSEFFDYFKVLCIQGFLTCRKHAERIILLVEMLQDSGFPCFKGGPRTIQNLRKRFHLSLTEEQCVSLVLSLISSSLDAWRTRQYDYYQRVLNGIL MHJ24.5 At5g64070