Difference between revisions of "Phosphatase Family Sac"
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=== Phosphatase domain === | === Phosphatase domain === | ||
| − | Based upon the crystal structure of yeast SAC1, the yeast SAC1 has two structure domains: SacN and catalytic domain <cite>Manford10</cite>). The SacN ranges approximately from 1-181; the catalytic | + | Based upon the crystal structure of yeast SAC1 (1-, the yeast SAC1 has two structure domains: SacN and catalytic phosphatase domain (PD) <cite>Manford10</cite>). The SacN ranges approximately from 1-181; the catalytic PD ranges approximately from 182-504. The SacN domain mediates the interaction with VPS74, which is proposed to mediate packaging of medial Golgi glycosyltransferases into coatomer (also called COP1)-coated vesicles, thereby maintaining Golgi residence <cite>Cai14</cite>. Yeast Sac1p has phosphatase activity towards PtdIns4P. The region of 451-511 has been shown to be required for PtdIns4P phosphatase activity <cite>Cai14</cite>, even though it was described as disordered in first crystal paper and not included in the study solving the structure <cite>Manford10</cite>. We include the region in our profile of Sac PD. See [[HMM_PD00008|HMM profile of SacN and catalytic domain]]. |
=== References === | === References === | ||
Revision as of 20:25, 28 October 2015
Phosphatase Classification: Fold CC1: Superfamily CC1: Family Sac
Subfamilies
The Sac family is found across eukaryotic genomes. It has four subfamilies, all of which are phosphoinositide phosphatases:
- SAC1 - an integral membrane phosphoinositide phosphatase located in endoplasmic reticulum (ER) and golgi apparatus. Its substrate in vivo is phosphatidylinositol 4-phosphate (PI4P), and it is also able to dephosphorylate other phosphoinositides in vitro. SAC1 is conserved in eukaryotes.
- INPP5F (SAC2) - a phosphoinositide phosphatase in the endocytic pathway. It is conserved in metazoa and fungi and is also found in a few plants and basal eukaryotes.
- FIG4 (SAC3) - a phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2) phosphatase located in the vacuolar membrane. It is associated with a form of Charcot-Marie-Tooth disorder CMT4J, Yunis-Varón syndrome, and amyotrophic lateral sclerosis (ALS). FIG4 is found in most if not all eukaryotes.
- Synaptojanin - a PI(3,5)P2 phosphatase in the endocytic pathway. It has two phosphatase domains dephosphorylate 3-position and 5-position of PtdIns(3,5)P2, respectively. It is found throughout eukaryotes except excavate and some chromalveolate. Human has two members (SYNJ1/INPP5G and SYNJ2/INPP5H) which originated from a duplication event in tetrapods.
Phosphatase domain
Based upon the crystal structure of yeast SAC1 (1-, the yeast SAC1 has two structure domains: SacN and catalytic phosphatase domain (PD) [1]). The SacN ranges approximately from 1-181; the catalytic PD ranges approximately from 182-504. The SacN domain mediates the interaction with VPS74, which is proposed to mediate packaging of medial Golgi glycosyltransferases into coatomer (also called COP1)-coated vesicles, thereby maintaining Golgi residence [2]. Yeast Sac1p has phosphatase activity towards PtdIns4P. The region of 451-511 has been shown to be required for PtdIns4P phosphatase activity [2], even though it was described as disordered in first crystal paper and not included in the study solving the structure [1]. We include the region in our profile of Sac PD. See HMM profile of SacN and catalytic domain.
References
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