Recent advances in target characterization and identification by photoaffinity probes

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Title
Recent advances in target characterization and identification by photoaffinity probes
Author(s)
J Sumranjit; Sang Jeon Chung
Bibliographic Citation
Molecules, vol. 18, no. 9, pp. 10425-10451
Publication Year
2013
Abstract
Target identification of biologically active molecules such as natural products, synthetic small molecules, peptides, and oligonucleotides mainly relies on affinity chromatography, activity-based probes, or photoaffinity labeling (PAL). Amongst them, activity-based probes and PAL have offered great advantages in target identification technology due to their ability to form covalent bonds with the corresponding targets. Activity-based probe technology mainly relies on the chemical reactivity of the target proteins, thereby limiting the majority of the biological targets to enzymes or proteins which display reactive residues at the probe-binding site. In general, the probes should bear a reactive moiety such as an epoxide, a Michael acceptor, or a reactive alkyl halide in their structures. On the other hand, photoaffinity probes (PAPs) are composed of a target-specific ligand and a photoactivatable functional group. When bound to the corresponding target proteins and activated with wavelength-specific light, PAPs generate highly reactive chemical species that covalently cross-link proximal amino acid residues. This process is better known as PAL and is widely employed to identify cellular targets of biologically active molecules. This review highlights recent advances in target identification by PAL, with a focus on the structure and chemistry of the photoaffinity probes developed in the recent decade, coupled to the target proteins identified using these probes.
Keyword
Affinity chromatographyBioorthogonal ligationChemical proteomicsClick chemistryPhoto-crosslinkingPhotoaffinity labelingProtein target identificationTwo step labeling
ISSN
1420-3049
Publisher
MDPI
DOI
http://dx.doi.org/10.3390/molecules180910425
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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