Download MendeleyIdentification of a Highly Conserved Hypothetical Protein TON_0340 as a Probable Manganese-Dependent Phosphatase.
Sohn, Y.S., Lee, S.G., Lee, K.H., Ku, B., Shin, H.C., Cha, S.S., Kim, Y.G., Lee, H.S., Kang, S.G., Oh, B.H.(2016) PLoS One 11: e0167549-e0167549
- PubMed: 27907125
- DOI: https://doi.org/10.1371/journal.pone.0167549
- Primary Citation of Related Structures:
5GKX, 5GL2, 5GL3, 5GL4 - PubMed Abstract:
A hypothetical protein TON_0340 of a Thermococcus species is a protein conserved in a variety of organisms including human. Herein, we present four different crystal structures of TON_0340, leading to the identification of an active-site cavity harboring a metal-binding site composed of six invariant aspartate and glutamate residues that coordinate one to three metal ions. Biochemical and mutational analyses involving many phosphorous compounds show that TON_0340 is a Mn2+-dependent phosphatase. Mg2+ binds to TON_0340 less tightly and activates the phosphatase activity less efficiently than Mn2+. Whereas Ca2+ and Zn2+ are able to bind to the protein, they are unable to activate its enzymatic activity. Since the active-site cavity is small and largely composed of nearly invariant stretches of 11 or 13 amino acids, the physiological substrates of TON_0340 and its homologues are likely to be a small and the same molecule. The Mn2+-bound TON_0340 structure provides a canonical model for the ubiquitously present TON_0340 homologues and lays a strong foundation for the elucidation of their substrate and biological function.
Organizational Affiliation:
Department of Biological Sciences, KAIST Institute for the Biocentury, Korea Advanced Institute of Science and Technology, Daejeon, Korea.
