Name: iFluor® 555-streptavidin conjugate
Brand: AAT Bioquest
SKU: 16959
Availability: InStock

iFluor® 555-streptavidin conjugate

iFluor® 555-Streptavidin Conjugate is an orange-fluorescent, biotin-binding probe for sensitive detection of biotinylated proteins, antibodies, nucleic acids, and other biomolecules in fluorescence-based assays.

High-Affinity Biotin Binding: Streptavidin enables specific detection of biotinylated targets.
Spectral Properties: Excitation at 557 nm and emission at 570 nm.
Spectral Compatibility: Alternative to Alexa Fluor® 555-streptavidin.
Applications: Suitable for indirect immunofluorescence staining and biotin-streptavidin-based assays.

Image of HeLa cells. HeLa cells were incubated with (Tubulin+) or without (Control) rabbit anti-tubulin, followed by biotinylated goat anti-rabbit IgG (H&L) (Cat# 16794) stain, and finally visualized with iFluor® 555-streptavidin conjugate (Cat# 16959).

Datasheet

Catalog	Size	Price	Quantity
16959	200 ug	Price
16989	1 mg	Price

Overview

AAT Bioquest's iFluor® dyes are optimized for labeling proteins, in particular, antibodies. These dyes are bright, photostable and have minimal quenching on proteins. They can be well excited by the major laser lines of fluorescence instruments (e.g., 350, 405, 488, 555 and 633 nm). Streptavidin conjugates are widely used together with a conjugate of biotin for specific detection of a variety of proteins, protein motifs, nucleic acids and other molecules since streptavidin has a very high binding affinity for biotin. A variety of the complementary biotinylated reagents are available from numerous commercial vendors.This iFluor® 555-streptavidin conjugate comprises streptavidin (as the biotin-binding protein) with iFluor® 555 covalently attached (as the fluorescent label). It is commonly used as a second step reagent for indirect immunofluorescent staining, when used in conjunction with biotinylated primary antibodies. iFluor® 555-streptavidin conjugates has fluorescence excitation and emission maxima of ~559 nm and ~569 nm respectively. These spectral characteristics make it an excellent alternative to Alexa Fluor® 555-streptavidin conjugate (Alexa Fluor® is the trademark of Invitrogen). It is a very valuable tool for biotin-streptavidin-based biological assays and tests.

Citations

View all 5 citations: Citation Explorer

Glycan Signatures on Neutrophils in an Equine Model for Autoimmune Uveitis

Authors:

Sprenzel, Carolin J and Amann, Barbara and Deeg, Cornelia A and Degroote, Roxane L

Journal:

Biomolecules (2025): 1444

An mTORC1-GRASP55 signaling axis controls unconventional secretion to reshape the extracellular proteome upon stress

Authors:

N{\"u}chel, Julian and Tauber, Marina and Nolte, Janica L and M{\"o}rgelin, Matthias and T{\"u}rk, Clara and Eckes, Beate and Demetriades, Constantinos and Plomann, Markus

Journal:

Molecular cell (2021): 3275--3293

Prostaglandin A1 Decreases the Phosphorylation of Tau by Activating Protein Phosphatase 2A via a Michael Addition Mechanism at Cysteine 377

Authors:

Xu, Guo-Biao and Guan, Pei-Pei and Wang, Pu

Journal:

Molecular Neurobiology (2020): 1--14

Prostaglandin A1 inhibits the phosphorylation of tau via activating protein phosphotase 2A in a michael addition mechanism at the site of cysteine 377

Authors:

Xu, Guo-Biao and Guan, Pei-Pei and Wang, Pu

Overexpression of MACC1 and the association with hepatocyte growth factor/c-Met in epithelial ovarian cancer

Authors:

Li, Hongyu and Zhang, Hui and Zhao, Shujun and Shi, Yun and Yao, Junge and Zhang, Yanyan and Guo, Huanhuan and Liu, Xingsuo

Journal:

Oncology letters (2015): 1989--1996

References

View all 47 references: Citation Explorer

A streptavidin paramagnetic-particle based competition assay for the evaluation of the optical selectivity of quadruplex nucleic acid fluorescent probes

Authors:

Largy E, Hamon F, Teulade-Fichou MP.

Journal:

Methods. (2012)

Biotin-4-fluorescein based fluorescence quenching assay for determination of biotin binding capacity of streptavidin conjugated quantum dots

Authors:

Mittal R, Bruchez MP.

Journal:

Bioconjug Chem (2011): 362

Iminobiotin binding induces large fluorescent enhancements in avidin and streptavidin fluorescent conjugates and exhibits diverging pH-dependent binding affinities

Authors:

Raphael MP, Rappole CA, Kurihara LK, Christodoulides JA, Qadri SN, Byers JM.

Journal:

J Fluoresc (2011): 647

Streptavidin-Binding Peptide (SBP)-tagged SMC2 allows single-step affinity fluorescence, blotting or purification of the condensin complex

Authors:

Kim JH, Chang TM, Graham AN, Choo KH, Kalitsis P, Hudson DF.

Journal:

BMC Biochem (2010): 50

Determination of 17beta-oestradiol by fluorescence immunoassay with streptavidin-conjugated quantum dots as label

Authors:

Sun M, Du L, Gao S, Bao Y, Wang S.

Journal:

Steroids (2010): 400

Physical properties

Molecular weight	~52000
Solvent	Water

Spectral properties

Correction factor (260 nm)	0.23
Correction factor (280 nm)	0.14
Extinction coefficient (cm ^-1 M ^-1)	100000 ¹
Excitation (nm)	557
Emission (nm)	570
Quantum yield	0.64 ¹

Usage and storage

Intended use	Research Use Only (RUO)
Storage	Freeze (< -15 °C); Minimize light exposure

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Page updated on October 28, 2026