Protein Modification Reagents
![eMolecules Broadpharm / TFA Amine-PEG-Fluor-647 TEA salts MW 2000 / 5mg / 798871050 / BP-40409 / / / [null] / 1046.250 / C44H63N5O16S4](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502472792.JPG-250.jpg)
eMolecules Broadpharm / TFA Amine-PEG-Fluor-647 TEA salts MW 2000 / 5mg / 798871050 / BP-40409 / / / [null] / 1046.250 / C44H63N5O16S4
Broadpharm / TFA Amine-PEG-Fluor-647 TEA salts MW 2000 / 5mg / 798871050 / BP-40409 / / / [null] / 1046.250 / C44H63N5O16S4
![eMolecules Broadpharm / HO-PEG-Fluor-647 TEA salts MW 2000 / 5mg / 798871047 / BP-40408 / / / [null] / 1047.230 / C44H62N4O17S4](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502472793.JPG-250.jpg)
eMolecules Broadpharm / HO-PEG-Fluor-647 TEA salts MW 2000 / 5mg / 798871047 / BP-40408 / / / [null] / 1047.230 / C44H62N4O17S4
Broadpharm / HO-PEG-Fluor-647 TEA salts MW 2000 / 5mg / 798871047 / BP-40408 / / / [null] / 1047.230 / C44H62N4O17S4
Cayman Chemical H TOPK 032 1mg
An inhibitor of TOPK (IC50 = ~2 µM), Chk1 (IC50 = 9.6 µM), and MEK1 (40% inhibition at 5 µM); decreases the growth of colon cancer and glioma initiating cells in vitro and suppresses tumor growth in vivo
Medchemexpress LLC Endo-BCN-PEG3-maleimide | 2141976-33-0 | MFCD31811466 | 98.5% | 519.59 g/mol | C26H37N3O8 | 5 MG
endo-BCN-PEG3-maleimide is a heterobifunctional PEG3 linker that pairs an endo-bicyclononyne (BCN) for strain-promoted azide-alkyne cycloaddition with a maleimide for thiol-selective conjugation. The short PEG3 spacer improves solubility and flexibility, making the reagent suitable for bioconjugation, PROTAC linker assembly, and crosslinking in research applications. Supplied as a colorless to light yellow oil with high reported purity and recommended cold storage.
- Strain-promoted azide-alkyne cycloaddition reactivity (BCN).
- Maleimide-based thiol conjugation for cysteine targeting.
- PEG3 spacer improves solubility and flexibility.
- High purity suitable for research use.
- Stable under low-temperature storage conditions.
- Soluble in common organic solvents such as DCM, THF, ACN, DMF, and DMSO.
Medchemexpress LLC Mal-amide-PEG2-oxyamine | 2253965-09-0 | 96.8% | 315.32 g/mol | C13H21N3O6 | 5 MG
Mal-amide-PEG2-oxyamine is a PEG-based bifunctional linker for assembling PROTACs and other bioconjugates. It features a maleimide amide and an oxyamine separated by a PEG2 spacer, permitting orthogonal thiol and oxime ligations. Supplied as a high-purity research reagent in milligram quantities.
- Contains maleimide and oxyamine functional groups for orthogonal conjugation.
- PEG2 spacer improves solubility and provides flexible linkage.
- Designed for PROTAC synthesis and targeted bioconjugation applications.
- High purity (96.8%) supports reproducible synthetic chemistry.
- Available in small milligram pack sizes suitable for research.
- Store pure material at -20°C for long-term stability.
Worthington Biochemical Corporation COLLAGENASE TYPE II FILTERED
Collagenase, Type 2 (Code: CLS-2), which is filtered through a 0.22 micron membrane and lyophilized in vials.
Cayman Chemical BIotIn-PEG3-azIde 10mg
A PEGylated version of biotin-azide that is more hydrophilic; can be used to label terminal alkynes via copper-catalyzed click reactions or copper-free click reactions with cyclooctynes; used to covalently tag proteins in combination with other tags
![eMolecules Broadpharm / Methyltetrazine-PEG4-Amido-PEG8-Mal-34-Dibromo / 10mg / 784454802 / BP-29734 / 98.000 / / [null] / 1024.755 / C40H60Br2N6O15](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502497263.JPG-250.jpg)
eMolecules Broadpharm / Methyltetrazine-PEG4-Amido-PEG8-Mal-34-Dibromo / 10mg / 784454802 / BP-29734 / 98.000 / / [null] / 1024.755 / C40H60Br2N6O15
Broadpharm / Methyltetrazine-PEG4-Amido-PEG8-Mal-34-Dibromo / 10mg / 784454802 / BP-29734 / 98.000 / / [null] / 1024.755 / C40H60Br2N6O15
eMolecules Mal-PEG6-NHS ester | Broadpharm | 1599472-25-9 | MFCD20926374 | 530.527 | C23H34N2O12 | 98.000 | O=C(CCOCCOCCOCCOCCOCCOCCN1C(=O)C=CC1=O)ON1C(=O)CCC1=O | 250mg | 208572696
Mal-PEG6-NHS ester | Broadpharm | 1599472-25-9 | MFCD20926374 | 530.527 | C23H34N2O12 | 98.000 | O=C(CCOCCOCCOCCOCCOCCOCCN1C(=O)C=CC1=O)ON1C(=O)CCC1=O | 250mg | 208572696
Medchemexpress LLC Fluorescein-PEG4-acid | 1807518-76-8 | MFCD23726637 | 95.0% | 654.68 g/mol | C32H34N2O11S | 5 MG
Fluorescein-PEG4-acid is a PEG-based linker that incorporates a fluorescein dye and terminates in a free carboxylic acid. It is intended for use as a linker in PROTAC synthesis and for covalent conjugation to biomolecules to provide fluorescent labeling for assays and imaging.
- PEG4 spacer with a fluorescein dye for fluorescence tagging.
- Terminal carboxylic acid enables amide coupling to amines.
- Suitable as a PROTAC linker and for fluorescent labeling applications.
- Yellow to orange solid; molecular weight 654.68 g/mol.
- Store under nitrogen, away from moisture; in solvent: -80°C (up to 6 months), -20°C (up to 1 month).