Protein: 1-phosphatidylinositol-3-phosphate 5-kinase FAB1B (Phosphatidylinositol 3-phosphate 5-kinase) (EC 2.7.1.150) (FYVE finger-containing phosphoinositide kinase) (PIKfyve) (Phosphatidylinositol 3-phosphate 5-kinase type III) (PIPkin-III) (Type III PIP kinase) (Protein FORMS APLOID AND BINUCLEATE CELLS 1B) (Q9LUM0)
Organism: Arabidopsis thaliana (Mouse-ear cress)
Function: The PI(3,5)P2 regulatory complex regulates both the synthesis and turnover of phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2). Catalyzes the phosphorylation of phosphatidylinositol 3-phosphate on the fifth hydroxyl of the myo-inositol ring, to form phosphatidylinositol 3,5-bisphosphate (By similarity). Plays an important role in maintenance of endomembrane homeostasis including endocytosis, vacuole formation, and vacuolar acidification processes. Required for development of viable pollen. Might mediate recycling of auxin transporters.
Subcellular location: Endosome membrane {ECO:0000269|PubMed:21173023}; Peripheral membrane protein {ECO:0000269|PubMed:21173023}.
Interaction partners:
- Phosphoinositide phosphatase SAC3
- Phosphatidylinositol-3-phosphatase SAC1
- Phosphoinositide phosphatase SAC5
- Phosphatidylinositol 3-kinase VPS34
- Phosphoinositide phosphatase SAC2
- Phosphoinositide phosphatase SAC4
- Phosphatidylinositol 4-kinase beta 1
- Protein VAC14 homolog
- Phosphoinositide phosphatase SAC8
- Phosphoinositide phosphatase SAC7
Sequence:
MGTRDSNNRTFSEIVGLIKSWLPWRSEPATVSRDFWMPDQSCRVCYECDCQFTLINRRHHCRHCGRVFCGKCTANSIPFAPSDLRTPREDWERIRVCNYCFRQWEQGDGGPHVSNITELSTSPSETSLLSSKTSTTANSSSFALGSMPGLIGLNQRVHHGSDVSLHGVSSMETSVTKQGKETSRRSSFIATDVEDPSRFALNSIRSDDEYDEYGAYQTDIETSHSPRANEYYGPMEYNGMGIDDVPCKHLGGETADQKSLSGSPLIHQCLESLIREGSEQFQKKSEHDGRDECEASSPADISDDQVVEPVDFENNGLLWVPPEPENEEDERESALFDEEDNEGDASGEWGYLRPSTSFGSGEYRGEDRTTEEHKKAMKNVVDGHFRALLAQLLQVENISVSDEEGKESWLEIITSLSWEAANLLKPDMSKSGGMDPGGYVKVKCLASGFRHDSMVVKGVVCKKNVVNRRMSTKIEKARLLILGGGLEYQRVSNQLSSFDTLLQQEKDHLKMAVAKIHAERPNILLVEKSVSRFAQEYLLAKDISLVLNIKRPLLDRIARCTGAQIIPSVDHLSSQKLGYCENFRVDRYPEEHGSTGQVGKKVVKTLMYFEHCPKPLGFTILLRGANEDELKKVKHVVQYGVFAAYHLALETSFLADEGASPELPLNSPITVALPDKSTSIERSISTVPGFTVSTYEKSPTMLSCAEPQRANSVPVSELLSTTTNLSIQKDIPPIPYGSGWQAREINPSFVFSRHNISLNLPDRVIESRNSDLSGRSVPVDTPADKSNPIVVADETTNNSLHLSGQGFVRKSSQIGTSIMVENQDNGSELTIAQQQNNEKPKETQSQKEEFPPSPSDHQSILVSLSSRSVWKGTVCERSHLFRIKYYGSFDKPLGRFLRDHLFDQSYRCRSCEMPSEAHVHCYTHRQGSLTISVKKLQDYLLPGEKEGKIWMWHRCLRCPRLNGFPPATLRVVMSDAAWGLSFGKFLELSFSNHAAASRVACCGHSLHRDCLRFYGFGNMVACFRYATIDVHSVYLPPSILSFNYENQDWIQRETDEVIERAELLFSEVLNAISQIAEKGFRRRIGELEEVLQKEKAEFEENMQKILHREVNEGQPLVDILELYRIHRQLLFQSYMWDHRLINASTLHKLENSDDTKREENEKPPLAKSQTLPEMNAGTNSLLTGSEVNLNPDGDSTGDTGSLNNVQKEADTNSDLYQEKDDGGEVSPSKTLPDTSYPLENKVDVRRTQSDGQIVMKNLSATLDAAWIGERQTSVEIPTNNKVSLPPSTMSNSSTFPPISEGLMPIDLPEQQNEFKVAYPVSPALPSKNYENSEDSVSWLSVPFLNFYRSINKNFLLSSQKLDTFGEHSPIYISSFREAELQGGPRLLLPVGLNDIVVPVYDDEPTSMIAYALMSPEYQRQTSAEGESLVSYPSELNIPRPVDDTIFDPSRSNGSVDESILSISSSRSTSLLDPLSYTKALHARVSYGEDGTLGKVKYTVTCYYAKRFEALRGICLPSELEYIRSLSRCKKWGAQGGKSNVFFAKTLDDRFIIKQVTKTELESFIKFAPAYFKYLSESISTKSPTCLAKILGIYQVATKQLKSGKETKMDVLIMENLLFGRTVKRLYDLKGSSRARYNPDSSGSNKVLLDQNLIEAMPTSPIFVGNKAKRLLERAVWNDTAFLALGDVMDYSLLVGVDEEKNELVLGIIDFLRQYTWDKHLESWVKFTGILGGPKNEAPTVISPKQYKRRFRKAMTTYFLMVPDQWSPPNVVANNSKSDQPEETSQAGTQAE