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Updated: Jan 20, 2026

Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
Published on: October 9, 2021
Synthesis of 4,6-Difluoro-Tryptophan as a Probe for Protein 19F NMR
Christina M Monnie1, Iker Hernández2, Raixie Meléndez-Pacheco1
1Department of Structural Biology, University of Pittsburgh School of Medicine, 3501 Fifth Ave., Pittsburgh, PA 15261, USA.
None:
A scalable procedure for the synthesis of 4,6-difluorotryptophan is reported based on a deaminative coupling of a 4,6-difluorogramine with 2-benzylthio-1,5-dihydro-4H-imidazolone as glycine equivalent. Thus prepared 4,6-difluorotryptophan was incorporated into the C-terminal domain of the HIV-1 capsid protein (CA-CTD), and 19F spectra of the 4,6-difluoro Trp CA CTD were recorded and compared to the singly fluorinated counterparts.
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