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. 2012 Jul 11;7(7):e40457. doi: 10.1371/journal.pone.0040457

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Schmidt et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. Dusp15 phosphatase activity was assessed using the DiFMUP (6,8-difluoro-4-methyumbelliferyl phosphate) assay at the experimentally optimal enzyme concentration of 4 ng/mL. B. Optimal pH activity (pH 6) was determined by testing a pH range from pH 3 to 8. C. and D. Activity of Dusp15/VHY on phospho-peptides substrates corresponding respectively to pY₁₁₉ and pY₇₇₁ dephosphorylation sites of SNX6 (NED(pY₁₁₉)AGYIIPPAP) and PDGFR-β (IESSN(pY₇₇₁)MAPYD). VHY/Dusp15 was used at 4 ng/mL at pH6 and activity was detected using the Malachite Green phosphate detection assay. OD, Optical Density at 620 nm. Dissociation constant (Km) was calculated as the substrate concentration needed to reach V_max/2 and expressed as Mean ± S_EM of three different experiments.