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  4. Quantifying single-cell diacylglycerol signaling kinetics after uncaging
 
research article

Quantifying single-cell diacylglycerol signaling kinetics after uncaging

Gonzales, David T.
•
Schuhmacher, Milena Maria  
•
Lennartz, H. Mathilda
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December 19, 2023
Biophysical Journal

Studying the role of molecularly distinct lipid species in cell signaling remains challenging due to a scarcity of methods for performing quantitative lipid biochemistry in living cells. We have recently used lipid uncaging to quantify lipid -pro-tein affinities and rates of lipid trans-bilayer movement and turnover in the diacylglycerol signaling pathway. This approach is based on acquiring live-cell dose-response curves requiring light dose titrations and experimental determination of uncaging photoreaction efficiency. We here aimed to develop a methodological approach that allows us to retrieve quantitative kinetic data from uncaging experiments that 1) require only typically available datasets without the need for specialized additional con-straints and 2) should in principle be applicable to other types of photoactivation experiments. Our new analysis framework al-lows us to identify model parameters such as diacylglycerol-protein affinities and trans-bilayer movement rates, together with initial uncaged diacylglycerol levels, using noisy single-cell data for a broad variety of structurally different diacylglycerol species. We find that lipid unsaturation degree and side-chain length generally correlate with faster lipid trans-bilayer movement and turn-over and also affect lipid-protein affinities. In summary, our work demonstrates how rate parameters and lipid-protein affinities can be quantified from single-cell signaling trajectories with sufficient sensitivity to resolve the subtle kinetic differences caused the chemical of cellular

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Type
research article
DOI
10.1016/j.bpj.2023.11.013
Web of Science ID

WOS:001145665200001

Author(s)
Gonzales, David T.
Schuhmacher, Milena Maria  
Lennartz, H. Mathilda
Iglesias-Artola, Juan M.
Kuhn, Sascha M.
Barahtjan, Pavel
Zechner, Christoph
Nadler, Andre
Date Issued

2023-12-19

Publisher

Cell Press

Published in
Biophysical Journal
Volume

122

Issue

24

Start page

4699

End page

4709

Subjects

Life Sciences & Biomedicine

•

Activation

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GR-SCHUHMACHER  
FunderGrant Number

EPFL School of Life Sciences

European Research Council (ERC) under the European Union

GA 758334 ASYM-MEM

Deutsche Forschungsgemeinschaft (DFG)

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Available on Infoscience
February 21, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/205104
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