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807664

Sigma-Aldrich

CBTF

Synonym(s):

APN-TFS ester, Sodium 4-((4-(cyanoethynyl)benzoyl)oxy)-2,3,5,6-tetrafluorobenzenesulfonate

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About This Item

Empirical Formula (Hill Notation):
C16H4F4NNaO5S
Molecular Weight:
421.26
UNSPSC Code:
12352200
PubChem Substance ID:
329768745
NACRES:
NA.22

form

powder

Quality Level

100

reaction suitability

reagent type: cross-linking reagent

functional group

ester

storage temp.

−20°C

SMILES string

O=C(OC1=C(F)C(F)=C(S(=O)(O[Na])=O)C(F)=C1F)C2=CC=C(C#CC#N)C=C2

InChI

1S/C16H5F4NO5S.Na/c17-10-12(19)15(27(23,24)25)13(20)11(18)14(10)26-16(22)9-5-3-8(4-6-9)2-1-7-21;/h3-6H,(H,23,24,25);/q;+1/p-1

InChI key

YFJYSJRZDOWXDH-UHFFFAOYSA-M

General description

CBTF (Sodium 4-((4-(cyanoethynyl)benzoyl)oxy)-2,3,5,6-tetrafluorobenzenesulfonate) is a heterobifunctional reagent. It bears a 3-arylpropionitrile (APN) group. CBTF can be prepared from 4-iodobenzoic acid. It participates in various amine-to-thiol coupling reactions. It participates in the synthesis of various antibody-dye conjugates. CBTF is widely used for antibody conjugation.

Application

CBTF is a bifunctional crosslinker for amine-to-thiol coupling. The coupling can be performed with high selectivity in biological medium using mild reaction conditions. CBTF readily reacts with organic amines in basic conditions to produce APN-probes suitable for cysteine labeling.

Other Notes

Standard protein labeling procedure (lysine labeling):
  • Dissolve the protein in an appropriate buffer* with pH 7.5-9.0 (e.g. PBS) at 1-10mg/mL concentration.
  • Apply the appropriate amount of the stock solution of the reagent (1-5 molar eq. per lysine residue).
  • Incubate at room temperature for 2 hours.
  • If necessary, purify the protein-APN conjugate using size exclusion chromatography or ultrafiltration.
  • The conjugate can be readily coupled with thiol-containing substrates by incubating the components in aqueous buffer (pH 6.5-9.0) at ambient temperature for 2 hours.



Standard protein labeling procedure (cysteine labeling):

Dissolve the protein in the appropriate buffer* with pH 6.5-9.0 (e.g. PBS) at 1-10mg/mL concentration.
Apply the appropriate amount of the stock solution of the APN-labeled molecule (1-5 molar eq. per free cysteine residue).
Incubate at room temperature for 2 hours.
If necessary, purify the protein conjugate using size exclusion chromatography or ultrafiltration.

*Note: avoid amine- and thiol-containing buffers.

Pictograms

Skull and crossbones
GHS06

Signal Word

Danger

Hazard Statements

H301

Precautionary Statements

P301 + P310 + P330

Hazard Classifications

Acute Tox. 3 Oral

Storage Class Code

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

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Construction of homogeneous antibody-drug conjugates using site-selective protein chemistry.
Akkapeddi P, et al.
Chemical Science, 7(5), 2954-2963 (2016)
Houzong Yao et al.
International journal of molecular sciences, 17(2), doi:10-doi:10 (2016-02-06)
Antibody-drug conjugates (ADCs) have become a promising targeted therapy strategy that combines the specificity, favorable pharmacokinetics and biodistributions of antibodies with the destructive potential of highly potent drugs. One of the biggest challenges in the development of ADCs is the
Sergii Kolodych et al.
Bioconjugate chemistry, 26(2), 197-200 (2015-01-24)
Amine-to-thiol coupling is the most common route for the preparation of antibody-drug conjugates (ADC). It is usually achieved by using heterobifunctional reagents possessing an activated ester at one end and a maleimide group at the other. However, maleimide-based conjugates were

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