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A rapidly maturing far-red derivative of DsRed-Express2 for whole-cell labeling.

ABSTRACT: Fluorescent proteins (FPs) with far-red excitation and emission are desirable for multicolor labeling and live-animal imaging. We describe E2-Crimson, a far-red derivative of the tetrameric FP DsRed-Express2. Unlike other far-red FPs, E2-Crimson is noncytotoxic in bacterial and mammalian cells. E2-Crimson is brighter than other far-red FPs and matures substantially faster than other red and far-red FPs. Approximately 40% of the E2-Crimson fluorescence signal is remarkably photostable. With an excitation maximum at 611 nm, E2-Crimson is the first FP that is efficiently excited with standard far-red lasers. We show that E2-Crimson has unique applications for flow cytometry and stimulated emission depletion (STED) microscopy.

SUBMITTER: Strack RL

PROVIDER: S-EPMC2861903 | biostudies-literature | 2009 Sep

REPOSITORIES: biostudies-literature

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A rapidly maturing far-red derivative of DsRed-Express2 for whole-cell labeling.

Strack Rita L RL Hein Birka B Bhattacharyya Dibyendu D Hell Stefan W SW Keenan Robert J RJ Glick Benjamin S BS

Biochemistry 20090901 35

Fluorescent proteins (FPs) with far-red excitation and emission are desirable for multicolor labeling and live-animal imaging. We describe E2-Crimson, a far-red derivative of the tetrameric FP DsRed-Express2. Unlike other far-red FPs, E2-Crimson is noncytotoxic in bacterial and mammalian cells. E2-Crimson is brighter than other far-red FPs and matures substantially faster than other red and far-red FPs. Approximately 40% of the E2-Crimson fluorescence signal is remarkably photostable. With an ex ...[more]

PMID: 19658435

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