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Healy AR, Houston DR, Remnant L, Huart AS, Brychtova V, Maslon MM, Meers O, Muller P, Krejci A, Blackburn EA, Vojtesek B, Hernychova L, Walkinshaw MD, Westwood NJ, Hupp TR. Discovery of a novel ligand that modulates the protein-protein interactions of the AAA+ superfamily oncoprotein reptin. Chem Sci 2015; 6:3109-3116. [PMID: 28706685 PMCID: PMC5490336 DOI: 10.1039/c4sc03885a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 03/20/2015] [Indexed: 12/31/2022] Open
Abstract
Developing approaches to discover protein-protein interactions (PPIs) remains a fundamental challenge. A chemical biology platform is applied here to identify novel PPIs for the AAA+ superfamily oncoprotein reptin. An in silico screen coupled with chemical optimization provided Liddean, a nucleotide-mimetic which modulates reptin's oligomerization status, protein-binding activity and global conformation. Combinatorial peptide phage library screening of Liddean-bound reptin with next generation sequencing identified interaction motifs including a novel reptin docking site on the p53 tumor suppressor protein. Proximity ligation assays demonstrated that endogenous reptin forms a predominantly cytoplasmic complex with its paralog pontin in cancer cells and Liddean promotes a shift of this complex to the nucleus. An emerging view of PPIs in higher eukaryotes is that they occur through a striking diversity of linear peptide motifs. The discovery of a compound that alters reptin's protein interaction landscape potentially leads to novel avenues for therapeutic development.
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Affiliation(s)
- Alan R Healy
- School of Chemistry & Biomedical Sciences Research Complex , University of St Andrews & EaStCHEM , North Haugh, St Andrews , KY16 9ST , UK .
| | - Douglas R Houston
- Centre for Chemical Biology , University of Edinburgh , EH9 3JG , UK .
| | - Lucy Remnant
- Edinburgh Cancer Research Centre , Cell Signalling Unit , University of Edinburgh , EH4 2XR , UK .
| | - Anne-Sophie Huart
- Edinburgh Cancer Research Centre , Cell Signalling Unit , University of Edinburgh , EH4 2XR , UK .
| | - Veronika Brychtova
- RECAMO , Masaryk Memorial Cancer Institute , 656 53 Brno , Czech Republic
| | - Magda M Maslon
- Edinburgh Cancer Research Centre , Cell Signalling Unit , University of Edinburgh , EH4 2XR , UK .
| | - Olivia Meers
- Edinburgh Cancer Research Centre , Cell Signalling Unit , University of Edinburgh , EH4 2XR , UK .
| | - Petr Muller
- RECAMO , Masaryk Memorial Cancer Institute , 656 53 Brno , Czech Republic
| | - Adam Krejci
- RECAMO , Masaryk Memorial Cancer Institute , 656 53 Brno , Czech Republic
| | | | - Borek Vojtesek
- RECAMO , Masaryk Memorial Cancer Institute , 656 53 Brno , Czech Republic
| | - Lenka Hernychova
- RECAMO , Masaryk Memorial Cancer Institute , 656 53 Brno , Czech Republic
| | | | - Nicholas J Westwood
- School of Chemistry & Biomedical Sciences Research Complex , University of St Andrews & EaStCHEM , North Haugh, St Andrews , KY16 9ST , UK .
| | - Ted R Hupp
- Edinburgh Cancer Research Centre , Cell Signalling Unit , University of Edinburgh , EH4 2XR , UK .
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