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Journal of Histochemistry and Cytochemistry, Vol. 47, 1179-1188, September 1999, Copyright © 1999, The Histochemical Society, Inc.

ARTICLE

Alexa Dyes, a Series of New Fluorescent Dyes that Yield Exceptionally Bright, Photostable Conjugates

Nataliya Panchuk–Voloshinaa, Rosaria P. Hauglanda, Janell Bishop–Stewarta, Mahesh K. Bhalgata, Paul J. Millarda, Fei Maoa, Wai-Yee Leunga, and Richard P. Hauglanda
a Molecular Probes, Inc., Eugene, Oregon

Correspondence to: Rosaria P. Haugland, Molecular Probes, Inc., 4849 Pitchford Ave., Eugene, OR 97402.

Alexa 350, Alexa 430, Alexa 488, Alexa 532, Alexa 546, Alexa 568, and Alexa 594 dyes are a new series of fluorescent dyes with emission/excitation spectra similar to those of AMCA, Lucifer Yellow, fluorescein, rhodamine 6G, tetramethylrhodamine or Cy3, lissamine rhodamine B, and Texas Red, respectively (the numbers in the Alexa names indicate the approximate excitation wavelength maximum in nm). All Alexa dyes and their conjugates are more fluorescent and more photostable than their commonly used spectral analogues listed above. In addition, Alexa dyes are insensitive to pH in the 4–10 range. We evaluated Alexa dyes compared with conventional dyes in applications using various conjugates, including those of goat anti-mouse IgG (GAM), streptavidin, wheat germ agglutinin (WGA), and concanavalin A (ConA). Conjugates of Alexa 546 are at least twofold more fluo-rescent than Cy3 conjugates. Proteins labeled with the Alexa 568 or Alexa 594 dyes are several-fold brighter than the same proteins labeled with lissamine rhodamine B or Texas Red dyes, respectively. Alexa dye derivatives of phalloidin stain F-actin with high specificity. Hydrazide forms of the Alexa dyes are very bright, formaldehyde-fixable polar tracers. Conjugates of the Alexa 430 (ex 430 nm/em 520 nm) and Alexa 532 (ex 530 nm/em 548 nm) fluorochromes are spectrally unique fluorescent probes, with relatively high quantum yields in their excitation and emission wavelength ranges. (J Histochem Cytochem 47:1179–1188, 1999)

Key Words: dyes, fluorescent conjugates, photostability, immunofluorescence, flow cytometry, microscopy


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