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Departments of * Pharmacology and § Chemistry and
Biochemistry, and Contributed by Roger Y. Tsien, April 23, 2002
All coelenterate fluorescent proteins cloned to date display some
form of quaternary structure, including the weak tendency of
Aequorea green fluorescent protein (GFP) to dimerize,
the obligate dimerization of Renilla GFP, and the
obligate tetramerization of the red fluorescent protein from
Discosoma (DsRed). Although the weak dimerization of
Aequorea GFP has not impeded its acceptance as an
indispensable tool of cell biology, the obligate tetramerization of
DsRed has greatly hindered its use as a genetically encoded fusion tag.
We present here the stepwise evolution of DsRed to a dimer and then
either to a genetic fusion of two copies of the protein, i.e., a tandem
dimer, or to a true monomer designated mRFP1 (monomeric red fluorescent
protein). Each subunit interface was disrupted by insertion of
arginines, which initially crippled the resulting protein, but red
fluorescence could be rescued by random and directed mutagenesis
totaling 17 substitutions in the dimer and 33 in mRFP1. Fusions of the
gap junction protein connexin43 to mRFP1 formed fully functional
junctions, whereas analogous fusions to the tetramer and dimer failed.
Although mRFP1 has somewhat lower extinction coefficient, quantum
yield, and photostability than DsRed, mRFP1 matures >10 times faster,
so that it shows similar brightness in living cells. In addition, the
excitation and emission peaks of mRFP1, 584 and 607 nm, are
Biochemistry
A monomeric red fluorescent protein
,
,
,
, and
,§,¶
Howard Hughes Medical Institute,
University of California at San Diego, 9500 Gilman Drive, La
Jolla, CA 92093
25 nm
red-shifted from DsRed, which should confer greater tissue penetration
and spectral separation from autofluorescence and other fluorescent proteins.
Present address: Merck Research Laboratories, 3535 General Atomics Court, San Diego, CA 92121.
www.pnas.org/cgi/doi/10.1073/pnas.082243699
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