6SLO
Crystal structure of PUF60 UHM domain in complex with 7,8 dimethoxyperphenazine
Summary for 6SLO
| Entry DOI | 10.2210/pdb6slo/pdb |
| Descriptor | Thioredoxin,Poly(U)-binding-splicing factor PUF60, MAGNESIUM ION, 2-[4-[3-(8-chloranyl-2,3-dimethoxy-phenothiazin-10-yl)propyl]piperazin-1-yl]ethanol, ... (4 entities in total) |
| Functional Keywords | uhm domain, splicing inhibitor, splicing |
| Biological source | Citrobacter freundii MGH 56 More |
| Total number of polymer chains | 4 |
| Total formula weight | 99664.37 |
| Authors | Jagtap, P.K.A.,Kubelka, T.,Bach, T.,Sattler, M. (deposition date: 2019-08-20, release date: 2020-09-09, Last modification date: 2024-10-09) |
| Primary citation | Jagtap, P.K.A.,Kubelka, T.,Soni, K.,Will, C.L.,Garg, D.,Sippel, C.,Kapp, T.G.,Potukuchi, H.K.,Schorpp, K.,Hadian, K.,Kessler, H.,Luhrmann, R.,Hausch, F.,Bach, T.,Sattler, M. Identification of phenothiazine derivatives as UHM-binding inhibitors of early spliceosome assembly. Nat Commun, 11:5621-5621, 2020 Cited by PubMed Abstract: Interactions between U2AF homology motifs (UHMs) and U2AF ligand motifs (ULMs) play a crucial role in early spliceosome assembly in eukaryotic gene regulation. UHM-ULM interactions mediate heterodimerization of the constitutive splicing factors U2AF65 and U2AF35 and between other splicing factors that regulate spliceosome assembly at the 3' splice site, where UHM domains of alternative splicing factors, such as SPF45 and PUF60, contribute to alternative splicing regulation. Here, we performed high-throughput screening using fluorescence polarization assays with hit validation by NMR and identified phenothiazines as general inhibitors of UHM-ULM interactions. NMR studies show that these compounds occupy the tryptophan binding pocket of UHM domains. Co-crystal structures of the inhibitors with the PUF60 UHM domain and medicinal chemistry provide structure-activity-relationships and reveal functional groups important for binding. These inhibitors inhibit early spliceosome assembly on pre-mRNA substrates in vitro. Our data show that spliceosome assembly can be inhibited by targeting UHM-ULM interactions by small molecules, thus extending the toolkit of splicing modulators for structural and biochemical studies of the spliceosome and splicing regulation. PubMed: 33159082DOI: 10.1038/s41467-020-19514-1 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.94 Å) |
Structure validation
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