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@ARTICLE{Kipper:120470,
author = {K. Kipper and E. G. Lundius and V. Ćurić and I. Nikić
and M. Wiessler$^*$ and E. A. Lemke and J. Elf},
title = {{A}pplication of {N}oncanonical {A}mino {A}cids for
{P}rotein {L}abeling in a {G}enomically {R}ecoded
{E}scherichia coli.},
journal = {ACS synthetic biology},
volume = {6},
number = {2},
issn = {2161-5063},
address = {Washington, DC},
publisher = {ACS},
reportid = {DKFZ-2017-00899},
pages = {233 - 255},
year = {2017},
abstract = {Small synthetic fluorophores are in many ways superior to
fluorescent proteins as labels for imaging. A major
challenge is to use them for a protein-specific labeling in
living cells. Here, we report on our use of noncanonical
amino acids that are genetically encoded via the
pyrrolysyl-tRNA/pyrrolysyl-RNA synthetase pair at
artificially introduced TAG codons in a recoded E. coli
strain. The strain is lacking endogenous TAG codons and the
TAG-specific release factor RF1. The amino acids contain
bioorthogonal groups that can be clicked to externally
supplied dyes, thus enabling protein-specific labeling in
live cells. We find that the noncanonical amino acid
incorporation into the target protein is robust for diverse
amino acids and that the usefulness of the recoded E. coli
strain mainly derives from the absence of release factor
RF1. However, the membrane permeable dyes display high
nonspecific binding in intracellular environment and the
electroporation of hydrophilic nonmembrane permeable dyes
severely impairs growth of the recoded strain. In contrast,
proteins exposed on the outer membrane of E. coli can be
labeled with hydrophilic dyes with a high specificity as
demonstrated by labeling of the osmoporin OmpC. Here,
labeling can be made sufficiently specific to enable single
molecule studies as exemplified by OmpC single particle
tracking.},
cin = {E020},
ddc = {540},
cid = {I:(DE-He78)E020-20160331},
pnm = {315 - Imaging and radiooncology (POF3-315)},
pid = {G:(DE-HGF)POF3-315},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:27775882},
doi = {10.1021/acssynbio.6b00138},
url = {https://inrepo02.dkfz.de/record/120470},
}