Abstract
PROTEIN tyrosine phosphatases (PTPases) and kinases coregulate the critical levels of phosphorylation necessary for intracellular signalling, cell growth and differentiation1,2. Yersinia, the causative bacteria of the bubonic plague and other enteric diseases, secrete an active PTPase3, Yop51, that enters and suppresses host immune cells4,5. Though the catalytic domain is only ∼20% identical to human PTP1B6, the Yersinia PTPase contains all of the invariant residues present in eukaryotic PTPases7, including the nucleophilic Cys 403 which forms a phosphocysteine intermediate during catalysis3,8–10. We present here structures of the unliganded (2.5 Å resolution) and tungstate-bound (2.6 Å) crystal forms which reveal that Cys 403 is positioned at the centre of a distinctive phosphate-binding loop. This loop is at the hub of several hydrogen-bond arrays that not only stabilize a bound oxyanion, but may activate Cys 403 as a reactive thiolate. Binding of tungstate triggers a conformational change that traps the oxyanion and swings Asp 356, an important catalytic residue7, by ∼6 Å into the active site. The same anion-binding loop in PTPases is also found in the enzyme rhodanese11.
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Stuckey, J., Schubert, H., Fauman, E. et al. Crystal structure of Yersinia protein tyrosine phosphatase at 2.5 Å and the complex with tungstate. Nature 370, 571–575 (1994). https://doi.org/10.1038/370571a0
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DOI: https://doi.org/10.1038/370571a0
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