Difference between revisions of "Phosphatase Subfamily MTMR14"
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[[Phosphatase classification|Phosphatase Classification]]: [[Phosphatase_Fold_CC1|Fold CC1]]: [[Phosphatase_Superfamily_CC1|Superfamily CC1]]: [[Phosphatase_Family_Myotubularin|Family Myotubularin]]: [[Phosphatase_Subfamily_MTMR14|Subfamily MTMR14]] | [[Phosphatase classification|Phosphatase Classification]]: [[Phosphatase_Fold_CC1|Fold CC1]]: [[Phosphatase_Superfamily_CC1|Superfamily CC1]]: [[Phosphatase_Family_Myotubularin|Family Myotubularin]]: [[Phosphatase_Subfamily_MTMR14|Subfamily MTMR14]] | ||
| − | MTMR14 is an | + | MTMR14 is an lipid phosphatase though to act on phosphatidylinositol bisphophosphates PtdIns(3,5)P2 and PtdIns (3,4)P2. |
===Evolution=== | ===Evolution=== | ||
| Line 9: | Line 9: | ||
===Domain Structure=== | ===Domain Structure=== | ||
| − | MTMR14 in | + | MTMR14 in eumetazoa has a conserved domain combination: a PH/GRAM domain and an active phosphatase domain. It may have a coiled-coil domain, but it is much weaker compared with other myotubularins using coiled-coil detection programs [http://www.ch.embnet.org/software/COILS_form.html COILS] and [http://paircoil2.csail.mit.edu/paircoil2.html PAIRCOIL2]. While most active myotubularins dimerize with inactive homologs through the coiled coil domain, no such inactive partner has been described for MTMR14, which may explain the weak coiled-coil score. |
Choanoflagellate Monosiga has a predicted transmembrane region (see [http://phosphatome.net/3.0/database/gene/uid/MbreP022 database]). | Choanoflagellate Monosiga has a predicted transmembrane region (see [http://phosphatome.net/3.0/database/gene/uid/MbreP022 database]). | ||
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MTMR14 has also been shown to be involved in the regulation of autophagy <cite>Vergne10, Gibbs10</cite>. | MTMR14 has also been shown to be involved in the regulation of autophagy <cite>Vergne10, Gibbs10</cite>. | ||
| + | |||
| + | Drosophila MTMR14, EDTP (Egg-Derived Tyrosine Phosphatase) has roles in oogenesis, embryogenesis <cite>Yamaguchi</cite>, and muscle aging, and its expression is induced along with several other autophagy genes during starvation <cite>Erdi</cite>. Another insect homolog, from Sarcophaga peregrina, showed tyrosine phosphatase activity in vitro and was degraded by cathepsin L during embyrogenesis <cite>Yamaguchi99</cite> | ||
===References=== | ===References=== | ||
<biblio> | <biblio> | ||
| + | #Erdi pmid=2562043 | ||
#tocsh06 pmid=17008356 | #tocsh06 pmid=17008356 | ||
#shen09 pmid=19465920 | #shen09 pmid=19465920 | ||
#Vergne10 pmid=19590496 | #Vergne10 pmid=19590496 | ||
#Gibbs10 pmid=20595810 | #Gibbs10 pmid=20595810 | ||
| + | #Yamaguchi pmid=16428301 | ||
| + | #Yamaguchi99 pmid=10092886 | ||
</biblio> | </biblio> | ||
Latest revision as of 23:03, 8 September 2016
Phosphatase Classification: Fold CC1: Superfamily CC1: Family Myotubularin: Subfamily MTMR14
MTMR14 is an lipid phosphatase though to act on phosphatidylinositol bisphophosphates PtdIns(3,5)P2 and PtdIns (3,4)P2.
Evolution
MTMR14 is found in most metazoa except nematodes, and in scattered protists.
Domain Structure
MTMR14 in eumetazoa has a conserved domain combination: a PH/GRAM domain and an active phosphatase domain. It may have a coiled-coil domain, but it is much weaker compared with other myotubularins using coiled-coil detection programs COILS and PAIRCOIL2. While most active myotubularins dimerize with inactive homologs through the coiled coil domain, no such inactive partner has been described for MTMR14, which may explain the weak coiled-coil score.
Choanoflagellate Monosiga has a predicted transmembrane region (see database).
Catalytic activity and functions
Human MTMR14 (JUMPY) dephosphorylates PtdIns(3,5)P2 and PtdIns (3,4)P2.
It is highly expressed in skeleton muscle and exogenous GFP-MTMR14 localizes to the Golgi apparatus in vitro [1]. Mice deficient in MTMR14 show muscle weakness and fatigue. The mechanism model behind is deficiency in MTMR14 causes accumulation of its substrates, especially PtdIns(3,5)P2 and PtdIns (3,4)P2, which bind, and directly activate, the Ca2+ release channel (ryanodine receptor 1, RyR1) of the internal store - the sarcoplasmic reticulum, and the activation of RyR1 results in the spontaneous Ca2+ leakage from the sarcoplasmic reticulum [2].
MTMR14 has also been shown to be involved in the regulation of autophagy [3, 4].
Drosophila MTMR14, EDTP (Egg-Derived Tyrosine Phosphatase) has roles in oogenesis, embryogenesis [5], and muscle aging, and its expression is induced along with several other autophagy genes during starvation [6]. Another insect homolog, from Sarcophaga peregrina, showed tyrosine phosphatase activity in vitro and was degraded by cathepsin L during embyrogenesis [7]
References
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