PA Janelia Fluor® 549, SE

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Cat.No. 6149 - PA Janelia Fluor 549, SE | C32H25N5O6 | CAS No. 1811539-42-0
Description: Photoactivatable cell permeable fluorescent dye; supplied as NHS ester
Chemical Name: 2,5-Dioxo-1-pyrrolidinyl 3',6'-di-1-azetidinyl-2-diazo-2,3-dihydro-3-oxospiro[1H-indene-1,9'-[9H]xanthene]-6-carboxylate

Biological Activity

Photoactivatable fluorescent dye; supplied as an NHS ester for coupling to primary amine groups. Non-fluorescent until activated at 365 nm. Photochemical quantum yield of uncaging = 2.2%, with improved yield upon protein conjugation. Compatible with self-labeling tag systems (e.g. HaloTag® and SNAPtag®). Suitable for single molecule tracking and super resolution microscopy in live cells, specifically live cell sptPALM and fixed cell PALM. Can be multiplexed with PA Janelia Fluor® 646, SE (Cat. No. 6150) to perform two-color sptPALM in live cells with activation at 405 nm. Cell permeable. Excitation maximum = 551 - 553 nm; emission maximum = 570 - 573 nm.

HaloTag is a trademark of Promega Corporation, and SNAP-tag is a trademark of New England BioLabs, Inc.

Licensing Information

Sold under license from the Howard Hughes Medical Institute, Janelia Research Campus

Technical Data

M. Wt 575.58
Formula C32H25N5O6
Storage Store at -20°C
CAS Number 1811539-42-0
PubChem ID 126569714
Smiles O=C(ON1C(CCC1=O)=O)C2=CC=C(C(C3=[N+]=[N-])=O)C(C43C5=CC=C(N6CCC6)C=C5OC7=CC(N8CCC8)=CC=C47)=C2

The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis.

All Tocris products are intended for laboratory research use only.

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
DMSO 5.76 10

Preparing Stock Solutions

The following data is based on the product molecular weight 575.58. Batch specific molecular weights may vary from batch to batch due to solvent of hydration, which will affect the solvent volumes required to prepare stock solutions.

Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.74 mL 8.69 mL 17.37 mL
5 mM 0.35 mL 1.74 mL 3.47 mL
10 mM 0.17 mL 0.87 mL 1.74 mL
50 mM 0.03 mL 0.17 mL 0.35 mL

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Product Datasheets

Safety Datasheet


References are publications that support the products' biological activity.

Grimm et al (2016) Bright photoactivatable fluorophores for single-molecule imaging. Nat.Methods 13 985 PMID: 27776112

Li et al (2016) Real-time imaging of Huntingtin aggregates diverting target search and gene transcription. eLife 5 e17056 PMID: 27484239

If you know of a relevant reference for PA Janelia Fluor® 549, SE, please let us know.

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