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1-phosphatidyl-1D-myo-inositol 3,4-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 4-phosphate + phosphate
-
-
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
1-phosphatidyl-1D-myo-inositol 3-phosphate + H2O
1-phosphatidyl-1D-myo-inositol + phosphate
1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate + H2O
?
-
-
-
-
?
1-phosphatidyl-1D-myo-inositol 5-phosphate + H2O
1-phosphatidyl-1D-myo-inositol + phosphate
-
-
-
?
di-C8 phosphatidylinositol 3,5-bisphosphate + H2O
?
-
-
-
?
di-C8 phosphatidylinositol 5-phosphate + H2O
?
-
-
-
?
additional information
?
-
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O

1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
-
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
isoform MTM1 can hydrolyze phosphatidylinositol 3,5-bisphosphate both in vitro and in mammalian cells
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
product causes myotubularin MTM1 to form a heptameric ring that is 12.5 nm in diameter, and it is a specific allosteric activator of myotubularin MTM1, and myotubularin-related proteins MTMR3 and MTMR6
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
-
product stimulates cell migration
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
the enzyme also has the activity of EC 3.1.3.64 (phosphatidylinositol-3-phosphatase)
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
presence of catalytically inactive MTMR9 increases the enzymatic activity of isoform MTMR6 toward 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate by over 30fold
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
presence of catalytically inactive MTMR9 increases the enzymatic activity of isoform MTMR8 toward 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate by 1.4fold
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
substrate binds most strongly to the GRAM domain of isoform MTMR2
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
-
-
-
?
1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate + H2O
1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate
-
no product: phosphatidylinositol
-
?
1-phosphatidyl-1D-myo-inositol 3-phosphate + H2O

1-phosphatidyl-1D-myo-inositol + phosphate
-
-
-
-
?
1-phosphatidyl-1D-myo-inositol 3-phosphate + H2O
1-phosphatidyl-1D-myo-inositol + phosphate
-
-
-
?
1-phosphatidyl-1D-myo-inositol 3-phosphate + H2O
1-phosphatidyl-1D-myo-inositol + phosphate
presence of catalytically inactive MTMR9 increases the enzymatic activity of isoform MTMR6 toward 1-phosphatidyl-1D-myo-inositol 3-phosphate by 2fold
-
-
?
1-phosphatidyl-1D-myo-inositol 3-phosphate + H2O
1-phosphatidyl-1D-myo-inositol + phosphate
presence of catalytically inactive MTMR9 increases the enzymatic activity of isoform MTMR8 toward 1-phosphatidyl-1D-myo-inositol 3-phosphate by 4fold
-
-
?
1-phosphatidyl-1D-myo-inositol 3-phosphate + H2O
1-phosphatidyl-1D-myo-inositol + phosphate
4fold lower rate of dephosphorylation compared with 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate
-
-
?
additional information

?
-
isoform MTM1 additionally hydrolyzes 1-phosphatidyl-1D-myo-inositol 3-phosphate, reaction of EC 3.1.3.64
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-
?
additional information
?
-
isoform MTMR6 shows similar activity with substrates 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate and 1-phosphatidyl-1D-myo-inositol 3-phosphate
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-
?
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metabolism
-
enzyme levels control Piezo2 ion channels-mediated rapidly adapting mechanically activated currents
malfunction

-
both depletion and overexpression of either myotubularin-related protein 3 or myotubularin-related protein 4 results in abnormal midbody morphology and cytokinesis failure
malfunction
-
enzyme knockdown markedly suppresses the motility, fusion, and fission of phosphatidylinositol 3-phosphate-enriched structures, resulting in decreases in late endosomes, autophagosomes, and lysosomes, and enlargement of phosphatidylinositol 3-phosphate-enriched early and late endosomes. Enzyme knockdown impairs starvation-induced transcription factor-EB nuclear translocation and lysosome biogenesis
malfunction
-
isoform MTMR14 deletion induces overweight and adult obesity accompanied by chronic inflammation in an age-dependent manner
physiological function

complex formation between the active isoform MTMR6 and catalytically inactive MTMR9 increases its catalytic activity and alters its substrate specificity. The MTMR6/MTMR9 complex prefers 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate as substrate. Presence of MTMR9 increases the enzymatic activity of MTMR6 toward 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate by over 30fold, and enhances the activity toward 1-phosphatidyl-1D-myo-inositol 3-phosphate by only 2fold. In cells, the MTMR6/R9 complex significantly increases the cellular levels of 1-phosphatidyl-1D-myo-inositol 3-phosphate, the product of 1-phosphatidyl-1D-myo-inositol 3-phosphate dephosphorylation
physiological function
complex formation between the active isoform MTMR6 and catalytically inactive MTMR9 increases its catalytic activity and alters its substrate specificity. The MTMR6/MTMR9 complex prefers 1-phosphatidyl-1D-myo-inositol 3-phosphate as substrate. Presence of MTMR9 increases the enzymatic activity of MTMR8 toward 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate by 1.4fold, and enhances the activity toward 1-phosphatidyl-1D-myo-inositol 3-phosphate by 4fold. In cells, the MTMR8/R9 complex reduces the cellular levels of 1-phosphatidyl-1D-myo-inositol 3-phosphate
physiological function
endogenous isoform MTMR2 and myotubularin-related protein MTMR13 proteins are associated in human embryonic kidney 293 cells. MTMR2-MTMR13 association is mediated by coiled-coil sequences present in each protein. Loss of MTMR13 function in Charcot-Marie-Tooth disease type 4B patients may lead to alterations in MTMR2 function and subsequent alterations in 3-phosphoinositide signaling
physiological function
in L6 myotubes overexpressing isoform MTM1, hyperosmotic shock induces an increase in the mass level of 1-phosphatidyl-1D-myo-inositol 5-phosphate that is reduced by 50% upon overexpression of the MTM1 inactive mutant D278A
physiological function
mutations in the gene encoding myotubularin-related protein MTMR2 are responsible for autosomal recessive Charcot-Marie-Tooth disease type 4B1. The known disease-associated MTMR2 mutations lead to dramatically reduced phosphatase activity
physiological function
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on depletion of isoform MTMR3 by RNAi, BJ cells are unable to migrate into the wound and show a significant decrease in velocity of about 60% and a decrease in persistence. While 80% of control cells present actin fibres perpendicular to the wound, only 52% of the cells show this on MTMR3 depletion
physiological function
-
myotubularin-related proteins 3 and 4 interact with polo-like kinase 1 and centrosomal protein of 55000 Da to ensure proper abscission
physiological function
-
overexpression of isoform MTMR3 inhibits the activity of the serine/threonine kinase complex mTORC1. Thus the enzyme regulates autophagy via its effect on mTORC1 activity
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A253K
-
the mutation enhances the kcat/Km value by 49% compared to the wild type enzyme
C375S
complete loss of activity
K255A
-
the mutation reduces the kcat/Km value by 66% compared to the wild type enzyme
K285A
the mutation has little effect on the phosphatase activity compared to the wild type enzyme
K484A
the mutant exhibits no phosphatase activity
R480A
the mutant shows slightly reduced phosphatase activity compared to the wild type enzyme
DELTAF494-E531
recessive Charcot-Marie-Tooth disease type 4B1 related mutation, almost complete loss of activity
E276X
recessive Charcot-Marie-Tooth disease type 4B1 related mutation, almost complete loss of activity
G103E
less than 5% residual activity
Q426X
recessive Charcot-Marie-Tooth disease type 4B1 related mutation, almost complete loss of activity
Q482X
recessive Charcot-Marie-Tooth disease type 4B1 related mutation, almost complete loss of activity
Y579Stop
recessive Charcot-Marie-Tooth disease type 4B1 related mutation, almost complete loss of activity
C413S

-
inactive
C413S
catalytically inactive mutant. Overexpression of a catalytically dead MTMR3 (C413S) in mammalian cells induces a striking formation of vacuolar compartments that enclose membranous structures that are highly concentrated in mutant proteins
C413S
-
mutant without catalytic activity, mutant is unable to rescue the RNAi-knockdown phenotype, indicating that isoform MTMR3 acts enzymatically on phosphoinositides during cell migration
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Schaletzky, J.; Dove, S.K.; Short, B.; Lorenzo, O.; Clague, M.J.; Barr, F.A.
Phosphatidylinositol-5-phosphate activation and conserved substrate specificity of the myotubularin phosphatidylinositol 3-phosphatases
Curr. Biol.
13
504-509
2003
Homo sapiens (Q9Y217)
brenda
Tronchere, H.; Laporte, J.; Pendaries, C.; Chaussade, C.; Liaubet, L.; Pirola, L.; Mandel, J.L.; Payrastre, B.
Production of phosphatidylinositol 5-phosphate by the phosphoinositide 3-phosphatase myotubularin in mammalian cells
J. Biol. Chem.
279
7304-7312
2004
Homo sapiens (Q13496)
brenda
Robinson, F.L.; Dixon, J.E.
The phosphoinositide-3-phosphatase MTMR2 associates with MTMR13, a membrane-associated pseudophosphatase also mutated in type 4B Charcot-Marie-tooth disease
J. Biol. Chem.
280
31699-31707
2005
Homo sapiens (Q13614)
brenda
Walker, D.M.; Urbe, S.; Dove, S.K.; Tenza, D.; Raposo, G.; Clague, M.J.
Characterization of MTMR3. an inositol lipid 3-phosphatase with novel substrate specificity
Curr. Biol.
11
1600-1605
2001
Homo sapiens (Q13615)
brenda
Oppelt, A.; Lobert, V.H.; Haglund, K.; Mackey, A.M.; Rameh, L.E.; Liest?l, K.; Schink, K.O.; Pedersen, N.M.; Wenzel, E.M.; Haugsten, E.M.; Brech, A.; Rusten, T.E.; Stenmark, H.; Wesche, J.
Production of phosphatidylinositol 5-phosphate via PIKfyve and MTMR3 regulates cell migration
EMBO Rep.
14
57-64
2013
Homo sapiens
brenda
Berger, P.; Bonneick, S.; Willi, S.; Wymann, M.; Suter, U.
Loss of phosphatase activity in myotubularin-related protein 2 is associated with Charcot-Marie-Tooth disease type 4B1
Hum. Mol. Genet.
11
1569-1579
2002
Mus musculus (Q9Z2D1)
brenda
Tsujita, K.; Itoh, T.; Ijuin, T.; Yamamoto, A.; Shisheva, A.; Laporte, J.; Takenawa, T.
Myotubularin regulates the function of the late endosome through the gram domain-phosphatidylinositol 3,5-bisphosphate interaction
J. Biol. Chem.
279
13817-13824
2004
Homo sapiens
brenda
Zou, J.; Zhang, C.; Marjanovic, J.; Kisseleva, M.V.; Majerus, P.W.; Wilson, M.P.
Myotubularin-related protein (MTMR) 9 determines the enzymatic activity, substrate specificity, and role in autophagy of MTMR8
Proc. Natl. Acad. Sci. USA
109
9539-9544
2012
Homo sapiens (Q96EF0), Homo sapiens (Q9Y217)
brenda
Yoo, K.Y.; Son, J.Y.; Lee, J.U.; Shin, W.; Im, D.W.; Kim, S.J.; Ryu, S.E.; Heo, Y.S.
Structure of the catalytic phosphatase domain of MTMR8 implications for dimerization, membrane association and reversible oxidation
Acta Crystallogr. Sect. D
71
1528-1539
2015
Homo sapiens
brenda
Bong, S.M.; Yang, S.W.; Choi, J.W.; Kim, S.J.; Lee, B.I.
Crystallization and preliminary X-ray crystallographic analysis of human myotubularin-related protein 1
Acta Crystallogr. Sect. F
71
261-265
2015
Homo sapiens
brenda
Lv, Y.; Xue, L.; Cai, C.; Liu, Q.H.; Shen, J.
Deficiency of myotubularin-related protein 14 influences body weight, metabolism, and inflammation in an age-dependent manner
Cell Biosci.
5
69
2015
Mus musculus
brenda
Narayanan, P.; Huette, M.; Kudryasheva, G.; Taberner, F.J.; Lechner, S.G.; Rehfeldt, F.; Gomez-Varela, D.; Schmidt, M.
Myotubularin related protein-2 and its phospholipid substrate PIP2 control Piezo2-mediated mechanotransduction in peripheral sensory neurons
eLife
7
e32346
2018
Homo sapiens
brenda
Hao, F.; Itoh, T.; Morita, E.; Shirahama-Noda, K.; Yoshimori, T.; Noda, T.
The PtdIns3-phosphatase MTMR3 interacts with mTORC1 and suppresses its activity
FEBS Lett.
590
161-173
2016
Homo sapiens
brenda
Pham, H.Q.; Yoshioka, K.; Mohri, H.; Nakata, H.; Aki, S.; Ishimaru, K.; Takuwa, N.; Takuwa, Y.
MTMR4, a phosphoinositide-specific 3-phosphatase, regulates TFEB activity and the endocytic and autophagic pathways
Genes Cells
23
670-687
2018
Homo sapiens
brenda
St-Denis, N.; Gupta, G.D.; Lin, Z.Y.; Gonzalez-Badillo, B.; Pelletier, L.; Gingras, A.C.
Myotubularin-related proteins 3 and 4 interact with polo-like kinase 1 and centrosomal protein of 55 kDa to ensure proper abscission
Mol. Cell. Proteomics
14
946-960
2015
Homo sapiens
brenda
Bong, S.M.; Son, K.B.; Yang, S.W.; Park, J.W.; Cho, J.W.; Kim, K.T.; Kim, H.; Kim, S.J.; Kim, Y.J.; Lee, B.I.
Crystal structure of human myotubularin-related protein 1 provides insight into the structural basis of substrate specificity
PLoS ONE
11
e0152611
2016
Homo sapiens (Q13613), Homo sapiens
brenda