6iam | pdb_00006iam
Modulating Protein-Protein Interactions with Visible Light Peptide Backbone Switches
Structural highlights
Function[WDR5_HUMAN] Contributes to histone modification. May position the N-terminus of histone H3 for efficient trimethylation at 'Lys-4'. As part of the MLL1/MLL complex it is involved in methylation and dimethylation at 'Lys-4' of histone H3. H3 'Lys-4' methylation represents a specific tag for epigenetic transcriptional activation. As part of the NSL complex it may be involved in acetylation of nucleosomal histone H4 on several lysine residues. May regulate osteoblasts differentiation.[1] [2] [3] [4] [5] [SUMO5_HUMAN] Ubiquitin-like protein that can be covalently attached to proteins as a monomer or as a lysine-linked polymer. Regulates the life cycle of promyelocytic leukemia nuclear bodies (PML-NBs). PolySUMO1P1/SUMO5 conjugation on 'Lys-160' of PML facilitates recruitment of PML-NB components, which enlarges PML-NB. SUMO1P1/SUMO5 also increases polySUMO2/3 conjugation of PML, resulting in RNF4-mediated disruption of PML-NBs.[6] Publication Abstract from PubMedLife relies on a myriad of carefully orchestrated processes, in which proteins and their direct interplay ultimately determine cellular function and disease. Modulation of this complex crosstalk has recently attracted attention, even as a novel therapeutic strategy. Herein, we describe the synthesis and characterization of two visible-light-responsive peptide backbone photoswitches based on azobenzene derivatives, to exert optical control over protein-protein interactions (PPI). The novel peptidomimetics undergo fast and reversible isomerization with low photochemical fatigue under alternatively blue-/green-light irradiation cycles. Both bind in the nanomolar range to the protein of interest. Importantly, the best peptidomimetic displays a clear difference between isomers in its protein-binding capacity and, in turn, in its potential to inhibit enzymatic activity through PPI disruption. In addition, crystal structure determination, docking and molecular dynamics calculations allow a molecular interpretation and open up new avenues in the design and synthesis of future photoswitchable PPI modulators. Modulating Protein-Protein Interactions with Visible-Light-Responsive Peptide Backbone Photoswitches.,Albert L, Penalver A, Djokovic N, Werel L, Hoffarth M, Ruzic D, Xu J, Essen LO, Nikolic K, Dou Y, Vazquez O Chembiochem. 2019 Jun 3;20(11):1417-1429. doi: 10.1002/cbic.201800737. Epub 2019 , Apr 25. PMID:30675988[7] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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