Article info Vol. 5  No. 4   pp.  141 ~ 144
Title Crystallization and preliminary diffraction analysis of DUSP28 through identification of a pseudo-thrombin cleavage site
Authors Won Hong1, Bonsu Ku2, Myungbin Kim1, Seung Jun Kim2 and Seong Eon Ryu1*
Institutions 1Department of Bioengineering, College of Engineering, Hanyang University, Seoul 04763, Korea, 2Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea *Correspondence: ryuse@hanyang.ac.kr
Abstract Dual specificity protein phosphatases (DUSPs) belong to the protein tyrosine phosphatase (PTP) family. DUSPs dephosphorylate both phospho-serine/threonine and phospho-tyrosine of mitogen activated protein kinases (MAPKs) and play important roles in cell growth, regulation and signaling. DUSP28, a member of the atypical DUSPs, has dephosphorylation activity towards proteins involved in cellular signaling processes. DUSP28 is also implicated in the development of pancreatic cancer and liver cancer. The atomic resolution structure of DUSP28 should help the structurebased design of specific and potent therapeutics. However, the structure and detailed function of DUSP28 have not been elucidated yet. Here, we prepared a large quantity of DUSP28 protein and crystallized the protein. During the protein preparation, we encountered an unexpected proteolytic cleavage in the middle of the protein domain and overcame the problem by identifying and mutating the pseudo-thrombin cleavage site. By using the purified protein, we were able to grow diffraction quality crystals and collected a 2.1 Å resolution diffraction data. The preliminary diffraction analysis revealed that the crystal is in the space group P3121 with unit cell parameters of a = 78.85 Å, b = 78.85 Å, c = 90.26 Å, α = 90.00°, β = 90.00° and γ = 120.00°