The inhibition of a subgroup of human serine/threonine protein phosphatases is responsible for the cytotoxicity of cantharidin and norcantharidin against tumor cells. It is shown that the anhydride rings of cantharidin and norcantharidin are hydrolyzed when bound to the catalytic domain of the human serine/threonine protein phosphatases 5 (PP5c), and the high-resolution crystal structures of PP5c complexed with the corresponding dicarboxylic acid derivatives of the two molecules are reported. Norcantharidin shows a unique binding conformation with the catalytically active Mn(2)PP5c, while cantharidin is characterized by a double conformation in its binding mode to the protein. Different binding modes of norcantharidin are observed depending of whether the starting ligand is in the anhydride or in the dicarboxylic acid form, All these structures will provide the basis for the rational design of new cantharidin-based drugs.

Structural basis of serine/threonine phosphatase inhibition by the archetypal small molecules cantharidin and norcantharidin / I.Bertini; V.Calderone; M.Fragai; C.Luchinat; E.Talluri. - In: JOURNAL OF MEDICINAL CHEMISTRY. - ISSN 0022-2623. - STAMPA. - 15:(2009), pp. 4838-4843. [10.1021/jm900610k]

Structural basis of serine/threonine phosphatase inhibition by the archetypal small molecules cantharidin and norcantharidin

BERTINI, IVANO;CALDERONE, VITO;FRAGAI, MARCO;LUCHINAT, CLAUDIO;TALLURI, ELEONORA
2009

Abstract

The inhibition of a subgroup of human serine/threonine protein phosphatases is responsible for the cytotoxicity of cantharidin and norcantharidin against tumor cells. It is shown that the anhydride rings of cantharidin and norcantharidin are hydrolyzed when bound to the catalytic domain of the human serine/threonine protein phosphatases 5 (PP5c), and the high-resolution crystal structures of PP5c complexed with the corresponding dicarboxylic acid derivatives of the two molecules are reported. Norcantharidin shows a unique binding conformation with the catalytically active Mn(2)PP5c, while cantharidin is characterized by a double conformation in its binding mode to the protein. Different binding modes of norcantharidin are observed depending of whether the starting ligand is in the anhydride or in the dicarboxylic acid form, All these structures will provide the basis for the rational design of new cantharidin-based drugs.
2009
15
4838
4843
I.Bertini; V.Calderone; M.Fragai; C.Luchinat; E.Talluri
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/368656
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