A thermosensitive gel matrix for bioreactor-assisted in-cell NMR of nucleic acids and proteins

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Authors

DZUROV Matej POSPÍŠILOVÁ Šárka KRAFČÍKOVÁ Michaela TRANTÍREK Lukáš VOJTOVÁ Lucy RYNEŠ Jan

Year of publication 2023
Type Article in Periodical
Magazine / Source Journal of biomolecular NMR
MU Faculty or unit

Central European Institute of Technology

Citation
Web https://link.springer.com/article/10.1007/s10858-023-00422-7
Doi http://dx.doi.org/10.1007/s10858-023-00422-7
Keywords PLA-PEG-PLA; Thermosensitive hydrogel; Cell immobilization; Bioreactor; In-cell NMR
Attached files
Description Introducing the flow through the bioreactor has revolutionized in-cell NMR spectroscopy by prolonging the measurement time available to acquire spectral information about biomacromolecules in metabolically active cells. Bioreactor technology relies on immobilizer matrices, which secure cells in the active volume of the NMR coil and enable uniform perfusion of the growth medium, supplying fresh nutrients to the cells while removing toxic byproducts of their metabolism. The main drawbacks of commonly used matrices include the inability to recover intact cells post-measurement for additional analyses and/or requirements for specific operating temperatures. Here, we report on the development and characterization of a set of thermosensitive and nontoxic triblock copolymers based on poly(D,L-lactide)-b-poly(ethylene glycol)-b-poly(D,L-lactide) (PLA-PEG-PLA). Here, we show for the first time that these copolymers are suitable as immobilizer matrices for the acquisition of in-cell NMR spectra of nucleic acids and proteins over a commonly used sample temperature range of 15-40 & DEG;C and, importantly, allow recovery of cells after completion of in-cell NMR spectra acquisition. We compared the performances of currently used matrices in terms of cell viability (dye exclusion assays), cellular metabolism (1D 31P NMR), and quality of in-cell NMR spectra of two model biomacromolecules (hybrid double-stranded/i-motif DNA and ubiquitin). Our results demonstrate the suitability and advantages of PLA-PEG-PLA copolymers for application in bioreactor-assisted in-cell NMR.
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