Introduction of labeled proteins into cells is essential for many situations in single molecule tracking. The existing methods involve perturbation of the cells, genetically encoded systems, or import mechanisms that leave the protein trapped in endosomes. A recent discovery published by the PI and his the two investigators on this grant, highlights how a peptide called Pep-1, and two Arg9 systems can be used to deliver proteins into the cytosol of COS-7 cells without capture into endosomes. They key is that the import was performed at 4?C, where endosome formation is suppressed. This proposal is to develop this discovery into a practical, robust system for delivery of proteins into cells without endosomyl entrapment. Key steps in the project include: (i) establishing generality with respect to a range of proteins in a diverse set of cell lines;(ii) systematically preparing and testing analogs of the delivery systems to arrive at optimized vehicles that are tested in progressively more rigorous experiments for free functional protein;and, (iii) mechanistic studies to allow the structures of the delivery agents to be correlated with their functions.

Public Health Relevance

This research is to develop a system that allows labeled proteins to be imported into cells without dramatically perturbing either the protein or the cell. This would be the first robust reagent of its kind, and would open the doors to single molecule tracking of proteins in living cells.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
Research Project (R01)
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Special Emphasis Panel (ZRG1-BST-K (50))
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Deatherage, James F
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Texas A&M University
Schools of Arts and Sciences
College Station
United States
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Xin, Dongyue; Burgess, Kevin (2016) Anthranilic acid-containing cyclic tetrapeptides: at the crossroads of conformational rigidity and synthetic accessibility. Org Biomol Chem 14:5049-58
Kamkaew, Anyanee; Burgess, Kevin (2015) Aza-BODIPY dyes with enhanced hydrophilicity. Chem Commun (Camb) 51:10664-7
Xin, Dongyue; Raghuraman, Arjun; Burgess, Kevin (2015) Extended piperidine-piperidinone protein interface mimics. J Org Chem 80:4450-8
Kue, Chin Siang; Kamkaew, Anyanee; Lee, Hong Boon et al. (2015) Targeted PDT agent eradicates TrkC expressing tumors via photodynamic therapy (PDT). Mol Pharm 12:212-22
Li, Xun; Taechalertpaisarn, Jaru; Xin, Dongyue et al. (2015) Protein-protein interface mimicry by an oxazoline piperidine-2,4-dione. Org Lett 17:632-5
Kamkaew, Anyanee; Thavornpradit, Sopida; Puangsamlee, Thamon et al. (2015) Oligoethylene glycol-substituted aza-BODIPY dyes as red emitting ER-probes. Org Biomol Chem 13:8271-6
Xin, Dongyue; Burgess, Kevin (2014) A chemoselective route to ?-enamino esters and thioesters. Org Lett 16:2108-10
Muthukrishnan, Nandhini; Donovan, Stephen; Pellois, Jean-Philippe (2014) The photolytic activity of poly-arginine cell penetrating peptides conjugated to carboxy-tetramethylrhodamine is modulated by arginine residue content and fluorophore conjugation site. Photochem Photobiol 90:1034-42
Xin, Dongyue; Holzenburg, Andreas; Burgess, Kevin (2014) Small Molecule Probes That Perturb A Protein-protein Interface In Antithrombin. Chem Sci 5:4914-4921
Meerovich, Igor; Muthukrishnan, Nandhini; Johnson, Gregory A et al. (2014) Photodamage of lipid bilayers by irradiation of a fluorescently labeled cell-penetrating peptide. Biochim Biophys Acta 1840:507-15

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