Abstract
A hallmark to decipher bioprocesses is to characterize protein–protein interactions in living cells. To do this, the development of innovative methodologies, which do not alter proteins and their natural environment, is particularly needed. Here, we report a method (LUCK, Laser UV Cross-linKing) to in vivo cross-link proteins by UV-laser irradiation of living cells. Upon irradiation of HeLa cells under controlled conditions, cross-linked products of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) were detected, whose yield was found to be a linear function of the total irradiation energy. We demonstrated that stable dimers of GAPDH were formed through intersubunit cross-linking, as also observed when the pure protein was irradiated by UV-laser in vitro. We proposed a defined patch of aromatic residues located at the enzyme subunit interface as the cross-linking sites involved in dimer formation. Hence, by this technique, UV-laser is able to photofix protein surfaces that come in direct contact. Due to the ultra-short time scale of UV-laser-induced cross-linking, this technique could be extended to weld even transient protein interactions in their native context.
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Acknowledgments
This research was partially supported by “Programma STAR” of University of Naples Federico II, “Compagnia di San Paolo” and “Istituto Banco di Napoli—Fondazione”. We acknowledge the STRAIN PROJECT (POR Campania FSE 2007/2013 CUP B25B0900000000), which provided a postdoctoral fellowship to M.C. The authors are deeply indebted to Professor Gennaro Marino for his interest in this work and very useful comments and suggestions.
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F. Itri, D.M. Monti were contributed equally to the paper.
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18_2015_2015_MOESM1_ESM.tif
Supplementary material 1 Electronic supporting material_Figure 1. Western blot analyses with anti-GAPDH antibodies of total proteins extracted from untreated cells (control) and from cells irradiated under the experimental conditions detailed in ESM_Table 1 (lanes 1-24). Protein samples in a, b and c refer to experimental conditions tested at constant energy dose (4.0 J). Protein samples in d and e were obtained by varying total irradiation energy between 2.4 and 4.4 J.(TIFF 2143 kb)
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Supplementary material 2 Electronic supporting material_Figure 2. SDS-PAGE analyses of UV-laser irradiated and control HeLa cell extracts immuno-selected by anti-GAPDH antibodies. Gel was cut into 12 slices (denoted by boxes 1–12) to be analysed by mass spectrometry; the results of slice-by-slice protein identification are reported in ESM_Table 3. M, molecular mass markers. (TIFF 3359 kb)
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Supplementary material 3 Electronic supporting material_Figure 3. Aromatic residues distance matrix as measured from human GAPDH crystal structure (PDB ID 1U8F). Distances are reported in angstroms and are highlighted in a heat map (blue/close, red/far) for visualization clarity. (TIFF 4461 kb)
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Itri, F., Monti, D.M., Della Ventura, B. et al. Femtosecond UV-laser pulses to unveil protein–protein interactions in living cells. Cell. Mol. Life Sci. 73, 637–648 (2016). https://doi.org/10.1007/s00018-015-2015-y
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DOI: https://doi.org/10.1007/s00018-015-2015-y