Function
Catalytic subunit of the PI3K complex that mediates formation of phosphatidylinositol 3-phosphate (PubMed:11927551). Together with bec-1, mediates the production of phosphatidylinositol 3-phosphate on intracellular vesicles and thereby regulates membrane trafficking (PubMed:11927551, PubMed:16111945). Plays a role in endosome-to-Golgi retrograde transport of mig-14 (PubMed:21183797). Involved in clearance of apoptotic cell corpses by phagosomes (PubMed:22272187). Phagosome maturation requires two sequential and non-overlapping pulses of phosphatidylinositol-3-phosphate (PI3P) on the vesicle surface which mediates recruitment of sortins snx-1 and lst-4 and small GTPases rab-5, rab-2 and rab-7, downstream of dynamin dyn-1 (PubMed:22272187, PubMed:18425118). The first pulse is initiated by piki-1, then maintained by vps-34 which also produces the second pulse (PubMed:22272187). Required for embryonic development (PubMed:22272187). Together with bec-1, involved in L3/L4 larval molting stage probably by regulating cuticle shedding (PubMed:11927551). Regulates the expansion of the nucleus outer membrane (PubMed:11927551). Involved in the secretion and localization of lrp-1 at the apical surface of hyp7 syncytium (PubMed:16111945). May regulate endocytosis in hypodermal cells (PubMed:11927551). May play a role in the formation of gut granules (a lysosome-related organelle) (PubMed:15843430). Plays a role in germ stem cell proliferation during larval development (PubMed:28285998).
Sequence
MIPGMRATPTESFSFVYSCDLQTNVQVKVAEFEGIFRDVLNPVRRLNQLFAEITVYCNNQQIGYPVCTSFHTPPDSSQLARQKLIQKWNEWLTLPIRYSDLSRDAFLHITIWEHEDDEIVNNSTFSRRLVAQSKLSMFSKRGILKSGVIDVQMNVSTTPDPFVKQPETWKYSDAWGDEIDLLFKQVTRQSRGLVEDVPWLDPFASRRIEMIRAKYKYSSPDRHVFLVLEMAAIRLGPTFYKVVYYEDETKNMRVSTSVNGGVGIVSACTRYCVADPELLLESLAEVKHSAMTRRIRDVEDERHRQVKPNKQAKDRLETIVNLPSSQVLTREQRDLVWKFRHYLRQFPKALNKYLRSVNWVHPQEVKTALALMNDWELIEAEDALELLSSAFTHPAVRAYSVSRLLEAASPEQVLLYLPQLVQALKYEQGQQLPEEGNPVPVVSEEEGKIPSVATTPTEELEGRDMTVVTKKEARKAASGDLATFLIDYALASPKVSNYLYWHLKTEIESTKESKEEHSKMYQNIQDRLMEALVKRPDTRAQVDSLHQQQIFVEDLIILMNEAKARGGRLNESKSAEFRTMLSRAKHMLDLKGVHLPLDPSFRLSSVIPDTASFFKSEMMPAKISFKVLQPNGKADRNIPEEYTVIFKTGDDLRQDQLIQQMVRLIDIILKKGQLDLKLTPYLVLSTGVGQGFVQCIKSKPLRAIQEQYKAHKMDCIREAMKELRPGDGPFGIEPNVIDNYVRSLAGYSVIMYILGLGDRHLDNLLLCENGKLFHVDFGFILGRDPKPMPPPMKLTSEMVQVMGGVKSKQFLEFVQHVDSAYRILRRHSNVLLNLFSLMLDAGIPDIAAEPDKAIFKIEQRLRLDLSDEAATKHIFTQIESSLNAKMAMISDIIHAYKQNLM