Identification of a Highly Conserved Hypothetical Protein TON_0340 as a Probable Manganese-Dependent Phosphatase

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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.
Publisher
PUBLIC LIBRARY SCIENCE
Issue Date
2016-12
Language
English
Article Type
Article
Keywords

IB RIBONUCLEOTIDE REDUCTASE; N-OXYGENASE AURF; CRYSTAL-STRUCTURE; SEQUENCE; DNA

Citation

PLOS ONE, v.11, no.12

ISSN
1932-6203
DOI
10.1371/journal.pone.0167549
URI
http://hdl.handle.net/10203/216130
Appears in Collection
BS-Journal Papers(저널논문)
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