Fluorescent Proteins, Nucleotides & Other Conjugates

5(6)-CFDA (full name: 5-(and-6)-Carboxyfluorescein diacetate) is membrane-permeant and thus can be loaded into cells via incubation. Once inside cells, CFDA is hydrolyzed by intracellular esterases to carboxyfluorescein (see #51013 ).

5-(and-6)-carboxy-2′,7′-dichlorofluorescein is similar to carboxyfluorescein (51013), but has lower pK_a. It is useful for detecting pH in more acidic environment.

5-(and-6)-FAM (full name: 5-(and-6)-Carboxyfluorescein mixed isomer) has a pKa of 6.5 and can be used as a pH indicator.

5-Aminoallyl-dUTP (AA-dUTP) can be enzymatically incorporated into DNA. The resulting amine-containing DNA can be subsequently labeled with a fluorescent dye, biotin or other haptens via conventional peptide coupling method.

5-Aminoallyl-dUTP can be enzymatically incorporated into DNA. The resulting amine-containing DNA can be subsequently labeled with a fluorescent dye, biotin or other haptens via conventional peptide coupling method.

5-Aminoallyl-UTP can be enzymatically incorporated into RNA for subsequent labeling with an amine-reactive fluorescent dye, biotin, or other hapten.

5-Aminoallyl-UTP can be enzymatically incorporated into RNA for subsequent labeling with an amine-reactive fluorescent dye, biotin, or other hapten via conventional peptide coupling methods.

5-Bromo-dUTP (5-Bromo-2′-deoxyuridine-5′-triphosphate) is widely used in TUNEL assay to detect apoptosis cells, and also is a good substrate for reverse transcriptase.

This dye can be used as a low pH indicator similar to 51015, and is also useful as a general green fluorescent label.

The pKa of 5-carboxy-2′,7′-dichlorosulfonefluorescein is near 4 and thus the dye is potentially an excellent pH indicator for acidic organelles.

5-CFDA is membrane-permeant and thus can be loaded into cells via incubation. Once inside cells, 5-CFDA is hydrolyzed by intracellular esterases to 5-carboxyfluorescein (see 50015).

5-TAMRA-dUTP (5-Tetramethylrhodamine-dUTP) can be enzymatically incorporated into DNA. Note: 5-TAMRA-dUTP may not be compatible with PCR labeling of DNA probes.

6-CFDA is membrane-permeant and thus can be loaded into cells via incubation. Once inside cells, 6-CFDA is hydrolyzed by intracellular esterases to 6-carboxyfluorescein.

Aminooxy-biotin can be used to covalently attach biotin to aldehyde or ketone groups on polysaccharides, glycoproteins or antibodies. Aminooxy-biotin has also been used to efficiently label cell-surface glycans on living animal cells.

Biocytin (ε-Biotinoyl-L-lysine) is a very useful cellular tracer that can be introduced into cells by microinjection.

Biotin alkyne reacts with azide to form 1,2,3-triazole by copper(I) catalyzed 1,3-dipolar Huisgen cycloaddition.