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Abstract
D-myo-inositol 1,4,5-trisphosphate (InsP3) is a fundamental second messenger
in cellular Ca2+ mobilization. InsP3 3-kinase, a highly specific enzyme binding
InsP3 in just one mode, phosphorylates InsP3 specifically at its secondary
3-hydroxyl group to generate a tetrakisphosphate. Using a chemical biology
approach with both synthetised and established ligands, combining synthesis,
crystallography, computational docking, HPLC and fluorescence polarization
binding assays using fluorescently-tagged InsP3, we have surveyed the limits of
InsP3 3-kinase ligand specificity and uncovered surprisingly unforeseen biosynthetic capacity. Structurally-modified ligands exploit active site plasticity
generating a helix-tilt. These facilitated uncovering of unexpected substrates
phosphorylated at a surrogate extended primary hydroxyl at the inositol
pseudo 3-position, applicable even to carbohydrate-based substrates. Crystallization experiments designed to allow reactions to proceed in situ facilitated unequivocal characterization of the atypical tetrakisphosphate products. In summary, we define features of InsP3 3-kinase plasticity and substrate tolerance that may be more widely exploitable.
in cellular Ca2+ mobilization. InsP3 3-kinase, a highly specific enzyme binding
InsP3 in just one mode, phosphorylates InsP3 specifically at its secondary
3-hydroxyl group to generate a tetrakisphosphate. Using a chemical biology
approach with both synthetised and established ligands, combining synthesis,
crystallography, computational docking, HPLC and fluorescence polarization
binding assays using fluorescently-tagged InsP3, we have surveyed the limits of
InsP3 3-kinase ligand specificity and uncovered surprisingly unforeseen biosynthetic capacity. Structurally-modified ligands exploit active site plasticity
generating a helix-tilt. These facilitated uncovering of unexpected substrates
phosphorylated at a surrogate extended primary hydroxyl at the inositol
pseudo 3-position, applicable even to carbohydrate-based substrates. Crystallization experiments designed to allow reactions to proceed in situ facilitated unequivocal characterization of the atypical tetrakisphosphate products. In summary, we define features of InsP3 3-kinase plasticity and substrate tolerance that may be more widely exploitable.
Original language | English |
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Article number | 1502 |
Journal | Nature Communications |
Volume | 15 |
Early online date | 19 Feb 2024 |
DOIs | |
Publication status | Published - 19 Feb 2024 |
Data Availability Statement
The authors declare that the main data supporting the findings of this study are available within the article and its Supplementary Information files. The atomic coordinates and structure factors of all structures generated in this study have been deposited in the PDB database (Research Collaboratory for Structural Bioinformatics, Rutgers University, New Brunswick, NJ (www.rcsb.org/)) under accession codes 8PP8, 8PP9, 8PPA, 8PPB, 8PPC, 8PPD, 8PPE, 8PPF, 8PPG, 8PPH, 8PPI and 8PPJ. The atomic coordinates used in this study are available in the PDB database under accession codes 1w2c, 1w2d, 1w2f and 5w2i. Source data are provided with this paper.Funding
This work has been supported by grants PID2020-117400GB-100 and BFU2017-89913-P from the Spanish Ministerio de Ciencia e Innovación and Ministerio de Economía y Competitividad. B.V.L.P is a Wellcome Trust Senior Investigator (grant 101010). This research was supported by The Wellcome Trust.
Funders | Funder number |
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Spanish Ministerio de Ciencia e Innovación | PID2020-117400GB-100 |
Ministerio de Economía y Empresa | BFU2017-89913-P |
The Wellcome Trust | 101010 |
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Chemical Biology of Cellular Signalling using Polyphosphate Messengers
Potter, B. (PI)
1/01/14 → 31/12/18
Project: UK charity