Protein Phosphatase Classification: DSP/aDSP※ aDSP family introduction aDSP (Atypical DSP) family contains phosphatases which are poorly characterized. They are smaller than MKP family and lack specific MAP kinase motifs (1). Family member DUSP3 is invloved in down-regulating the ERK pathway and specifically dephosphorylates and inactivates ERK1 and ERK2 (2). DUSP11 shows phosphatase activity towards RNA 5'-triphosphatase and may participate in nuclear mrna metabolism. The studies show that most of aDSP phosphatase have function unrelated to MAP kinases (3).
Reference
1. Alonso, A., Sasin, J., Bottini, N., Friedberg, I., Osterman, A., Godzik, A., Hunter, T., Dixon, J. and Mustelin, T. (2004) Protein tyrosine phosphatases in the human genome. Cell, 117, 699-711. PMID:15186772
2. Todd, J.L., Tanner, K.G. and Denu, J.M. (1999) Extracellular regulated kinases (ERK) 1 and ERK2 are authentic substrates for the dual-specificity protein-tyrosine phosphatase VHR. A novel role in down-regulating the ERK pathway. J Biol Chem, 274, 13271-13280. PMID: 10224087
3. Yuan, Y., Li, D.M. and Sun, H. (1998) PIR1, a novel phosphatase that exhibits high affinity to RNA . ribonucleoprotein complexes. J Biol Chem, 273, 20347-20353. PMID: 9685386
DSP aDSP in eukaryotes:
1. Alonso, A., Sasin, J., Bottini, N., Friedberg, I., Osterman, A., Godzik, A., Hunter, T., Dixon, J. and Mustelin, T. (2004) Protein tyrosine phosphatases in the human genome. Cell, 117, 699-711. PMID:15186772
2. Todd, J.L., Tanner, K.G. and Denu, J.M. (1999) Extracellular regulated kinases (ERK) 1 and ERK2 are authentic substrates for the dual-specificity protein-tyrosine phosphatase VHR. A novel role in down-regulating the ERK pathway. J Biol Chem, 274, 13271-13280. PMID: 10224087
3. Yuan, Y., Li, D.M. and Sun, H. (1998) PIR1, a novel phosphatase that exhibits high affinity to RNA . ribonucleoprotein complexes. J Biol Chem, 273, 20347-20353. PMID: 9685386
DSP aDSP in eukaryotes: