6MC1

Structure of MAP kinase phosphatase 5 in complex with 3,3-dimethyl-1-((9-(methylthio)-5,6-dihydrothieno[3,4-h]quinazolin-2-yl)thio)butan-2-one, an allosteric inhibitor

Summary for 6MC1

• Entry DOI: 10.2210/pdb6mc1/pdb
• Descriptor: Dual specificity protein phosphatase 10, 3,3-dimethyl-1-{[9-(methylsulfanyl)-5,6-dihydrothieno[3,4-h]quinazolin-2-yl]sulfanyl}butan-2-one, 2,3-DIHYDROXY-1,4-DITHIOBUTANE, ... (4 entities in total)
• Functional Keywords: phosphatase, protein-tyrosine phosphatase, dual specificity phosphatase, phosphatase-inhibitor complex, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 6
• Total formula weight: 107717.36

Authors

Gannam, Z.T.K.,Anderson, K.S.,Bennett, A.M.,Lolis, E. (deposition date: 2018-08-30, release date: 2020-08-19, Last modification date: 2023-10-11)

Primary citation

Gannam, Z.T.K.,Min, K.,Shillingford, S.R.,Zhang, L.,Herrington, J.,Abriola, L.,Gareiss, P.C.,Pantouris, G.,Tzouvelekis, A.,Kaminski, N.,Zhang, X.,Yu, J.,Jamali, H.,Ellman, J.A.,Lolis, E.,Anderson, K.S.,Bennett, A.M.
An allosteric site on MKP5 reveals a strategy for small-molecule inhibition.
Sci.Signal., 13:-, 2020

PubMed Abstract: The mitogen-activated protein kinase (MAPK) phosphatases (MKPs) have been considered "undruggable," but their position as regulators of the MAPKs makes them promising therapeutic targets. MKP5 has been suggested as a potential target for the treatment of dystrophic muscle disease. Here, we identified an inhibitor of MKP5 using a p38α MAPK-derived, phosphopeptide-based small-molecule screen. We solved the structure of MKP5 in complex with this inhibitor, which revealed a previously undescribed allosteric binding pocket. Binding of the inhibitor to this pocket collapsed the MKP5 active site and was predicted to limit MAPK binding. Treatment with the inhibitor recapitulated the phenotype of MKP5 deficiency, resulting in activation of p38 MAPK and JNK. We demonstrated that MKP5 was required for TGF-β1 signaling in muscle and that the inhibitor blocked TGF-β1-mediated Smad2 phosphorylation. TGF-β1 pathway antagonism has been proposed for the treatment of dystrophic muscle disease. Thus, allosteric inhibition of MKP5 represents a therapeutic strategy against dystrophic muscle disease.

PubMed: 32843541
DOI: 10.1126/scisignal.aba3043

Experimental method

X-RAY DIFFRACTION (2.7 Å)