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Excited State Photoreaction between the Indole Side Chain of Tryptophan and Halocompounds Generates New Fluorophores and Unique Modifications
- Source :
- Photochemistry and Photobiology.
- Publication Year :
- 2014
- Publisher :
- Wiley, 2014.
-
Abstract
- Photoreaction of indole containing compounds with chloroform and other trichlorocompounds generates products with redshifted fluorescence. In proteins, this reaction can be used for the fluorescent detection of proteins. Little characterization of products generated through the photochemical reaction of indoles with halocompounds has been done, yet is fundamental for the development of other fluorophores, protein labeling agents, and bioactive indole derivatives. Here, we have characterized which isomers form in the photoreaction between tryptophan and chloroform using (1)H-NMR of tryptophan and methylated derivatives to reveal that the two major products that are formed result from modification at the 4- and 6-carbon positions of the indole ring. Reaction at position 6 generates 6-formyl tryptophan and the reaction at position 4 generates an imine because the formyl derivative that is initially formed reacts further with the tryptophan amine group. The spectroscopic properties and product molecular weights of photoproducts formed from photoreaction of tryptophan with other trihalo and monohalocompounds are also determined. The indole ring of tryptophan can be modified with various additions from halocompounds, including the addition of labels to the indole ring via methylene groups. This opens possibilities for generating novel tryptophan based fluorophores and protein labeling strategies using this photochemistry.
- Subjects :
- Indoles
Magnetic Resonance Spectroscopy
Light
Imine
Ethylene Chlorohydrin
Ring (chemistry)
Photochemistry
Biochemistry
chemistry.chemical_compound
Acetamides
Side chain
Chloroacetates
Physical and Theoretical Chemistry
Methylene
Fluorescent Dyes
Indole test
Staining and Labeling
Chemistry
Tryptophan
General Medicine
Photochemical Processes
Fluorescence
Molecular Weight
Amine gas treating
Chloroform
Imines
Trihalomethanes
Subjects
Details
- ISSN :
- 00318655
- Database :
- OpenAIRE
- Journal :
- Photochemistry and Photobiology
- Accession number :
- edsair.doi.dedup.....739c5e3c7ca73575d86a1a3284961edf