1j97
Phospho-Aspartyl Intermediate Analogue of Phosphoserine phosphatase
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OverviewOverview
Protein phosphoaspartate bonds play a variety of roles. In response, regulator proteins of two-component signal transduction systems, phosphorylation of an aspartate residue is coupled to a change from an, inactive to an active conformation. In phosphatases and mutases of the, haloacid dehalogenase (HAD) superfamily, phosphoaspartate serves as an, intermediate in phosphotransfer reactions, and in P-type ATPases, also, members of the HAD family, it serves in the conversion of chemical energy, to ion gradients. In each case, lability of the phosphoaspartate linkage, has hampered a detailed study of the phosphorylated form. For response, regulators, this difficulty was recently overcome with a phosphate analog, BeF(3)(-), which yields persistent complexes with the active site, aspartate of their receiver domains. We now extend the application of this, analog to a HAD superfamily member by solving at 1.5-A resolution the, x-ray crystal structure of the complex of BeF(3)(-) with phosphoserine, phosphatase (PSP) from Methanococcus jannaschii. The structure is, comparable to that of a phosphoenzyme intermediate: BeF(3)(-) is bound to, Asp-11 with the tetrahedral geometry of a phosphoryl group, is coordinated, to Mg(2+), and is bound to residues surrounding the active site that are, conserved in the HAD superfamily. Comparison of the active sites of, BeF(3)(-) x PSP and BeF(3)(-) x CeY, a receiver domain/response regulator, reveals striking similarities that provide insights into the function not, only of PSP but also of P-type ATPases. Our results indicate that use of, BeF(3)(-) for structural studies of proteins that form phosphoaspartate, linkages will extend well beyond response regulators.
About this StructureAbout this Structure
1J97 is a Single protein structure of sequence from Methanocaldococcus jannaschii with MG and PO4 as ligands. Active as Phosphoserine phosphatase, with EC number 3.1.3.3 Full crystallographic information is available from OCA.
ReferenceReference
BeF(3)(-) acts as a phosphate analog in proteins phosphorylated on aspartate: structure of a BeF(3)(-) complex with phosphoserine phosphatase., Cho H, Wang W, Kim R, Yokota H, Damo S, Kim SH, Wemmer D, Kustu S, Yan D, Proc Natl Acad Sci U S A. 2001 Jul 17;98(15):8525-30. Epub 2001 Jul 3. PMID:11438683
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