The ChromoTek RFP-Trap® Magnetic Agarose are affinity beads for immunoprecipitation of RFP-fusion proteins.
It comprises a RFP Nanobody/ VHH coupled to magnetic agarose.
mCherry, mRFP, mPlum, tagRFP, mKate2 and more RFP derivatives:
Fluorescent protein specificity table
On-bead enzyme assays
ChIP/ RIP analysis
|Product RFP-Trap Magnetic Agarose||Size 250 µL (10 reactions)||Code rtma-10||Price $ 275||Buy +|
|Product RFP-Trap Magnetic Agarose||Size 500 µL (20 reactions)||Code rtma-20||Price $ 475||Buy +|
|Product RFP-Trap Magnetic Agarose||Size 2.5 mL (100 reactions)||Code rtma-100||Price $ 2050||Buy +|
|Product RFP-Trap Magnetic Agarose||Size 5 mL (200 reactions)||Code rtma-200||Price Please inquire|
|Product RFP-Trap Magnetic Agarose||Size 10 mL (400 reactions)||Code rtma-400||Price Please inquire|
|Product RFP-Trap Magnetic Agarose Kit||Size 500 µL (20 reactions)||Code rtmak-20||Price $ 595||Buy +|
|Product Binding Control Magnetic Agarose Beads||Size 500 µL (20 reactions)||Code bmab-20||Price $ 75||Buy +|
|Product RFP VHH, recombinant binding protein||Size 250 µL||Code rt-250||Price $ 275||Buy +|
Dissociation constant KD of 5 nM
Wash buffer compatibility
4 M urea, 2 M NaCl, 10 mM DTT, 2 % Nonidet P40 Substitute, 1 % Triton X-100
mRFP, mCherry, mRFPruby, mPlum, tagRFP, mKate2, mOrange, PA-mCherry, mScarlet and more.
For complete list, please click here: Fluorescent protein specificity table
10 µL slurry bind ~8 µg of recombinant mCherry
Coupled Nanobody/ VHH
recombinant, monoclonal anti-Red Fluorescent Protein (RFP) single domain antibody (sdAb) fragment
Bead size: ~ 40 µm
Storage buffer: 20 % EtOH
- SDS sample buffer
- 0.2 M glycine pH 2.5
Instead of elution, we recommend on-bead assays like on-bead digestion for MS analysis.
Compatibility with mass spectrometry
The RFP-Trap is optimized for on-bead digestion. Complete tryptic digest results in 6-7 peptides.
How to cite this product
Shipped at ambient temperature. Upon receipt store at 4°C. Stable for one year.
Rose Willett,Jose A Martina,James P Zewe,Rachel Wills,Gerald R V Hammond,Rosa Puertollano (2017), TFEB regulates lysosomal positioning by modulating TMEM55B expression and JIP4 recruitment to lysosomes., Nat Commun, link
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Marie Maclennan,Marta Garcia-Cañadas,Judith Reichmann,Elena Khazina,Gabriele Wagner,Christopher J Playfoot,Carmen Salvador-Palomeque,Abigail R Mann,Paula Peressini,Laura Sanchez,Karen Dobie,David Read,Chao-Chun Hung,Ragnhild Eskeland,Richard R Meehan,Ol. (2017), Mobilization of LINE-1 retrotransposons is restricted by Tex19.1 in mouse embryonic stem cells., Elife, link
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Wei Jiang,Yuehua Wei,Yong Long,Arthur Owen,Bingying Wang,Xuebing Wu,Shuo Luo,Yongjun Dang,Dengke K Ma (2018), A genetic program mediates cold-warming response and promotes stress-induced phenoptosis in C. elegans., Elife, link
Hui Li,Nan Luo,Weidong Wang,Zengyu Liu,Jisheng Chen,Liangtao Zhao,Li Tan,Chunyan Wang,Yuan Qin,Chao Li,Tongda Xu,Zhenbiao Yang (2018), The REN4 rheostat dynamically coordinates the apical and lateral domains of Arabidopsis pollen tubes., Nat Commun, link
Sheng Sun,Vikas Yadav,R Blake Billmyre,Christina A Cuomo,Minou Nowrousian,Liuyang Wang,Jean-Luc Souciet,Teun Boekhout,Betina Porcel,Patrick Wincker,Joshua A Granek,Kaustuv Sanyal,Joseph Heitman (2017), Fungal genome and mating system transitions facilitated by chromosomal translocations involving intercentromeric recombination., PLoS Biol, link
What are the biophysical parameters of the RFP-Trap®?
Molecular weight: 14,9 kDa; Extinction coefficient: 30035 M-1 cm-1
Should I use an N-terminal or C-terminal fusion tag?
Both the N-terminal or C-terminal fusion tag work well with the traps.
How can I avoid unspecific protein interactions binding to the trap?
How can I elute bound proteins from a trap in their native state?
You can elute your fusion protein of interest with 0.2 M glycine pH 2.5 at room temperature. Pipette the beads up and down for 60-120 seconds and repeat this step. Ensure to neutralize your supernatant immediately afterwards by adding 1 M Tris base pH 10.4.
How many mammalian cells are required for an immunoprecipitation reaction?
For one immunoprecipitation reaction, we recommend using ~10^6 - 10^7 mammalian cells. The yield is also dependent on the expression level of your protein of interest and the interaction partners.
How much cell extract should I use for an immunoprecipitation reaction?
For other type of cells than mammalian cells, we recommend using 0.5 - 1.0 mg of cell extract.
Do I need to elute bound proteins from the beads for mass spectrometry analysis?
Do I need to elute my protein of interest from the beads for enzymatic assays?
What is the amount of trap slurry I need for one immunoprecipitation reaction?
25 µL slurry are sufficient for one pull-down reaction as the affinity of the traps is very high.
Specifications of RFP-Trap Agarose, Magnetic Agarose, and Magnetic Beads
Agarose (4% cross-linked)
Magnetic agarose (6% cross linked)
Magnetic Beads M-270
Porous; sold iron core
RFP-tagged protein size*
Small to large size
Small to large size
Small to very large size; no size limitation
Medium particle size
9 µg/ 10 µL
8 µg/ 10 µL
0.5 μg/ 10 μL
Magnetic separation & automation
May be centrifuged up to
2,500 x g
800 x g
8,000 x g
* Does depend on protein size and shape, protein multimers, complexes and interaction partners
- From cell to gel in less than one hour
- No heavy & light chains in your downstream application
- Robust performance with high yield
- Short incubation time of about 30 minutes
RFP-Trap Magnetic Agarose Kit
The RFP-Trap Magnetic Agarose is also available in a kit, including:
- RFP-Trap Magnetic Agarose
- Lysis*, wash and elution buffers
*The lysis buffer provided is suitable for mammalian cells. For other cell types use another suitable lysis buffer.
Binding Control for Magnetic Agarose Beads
"...the beads were glowing purple so we knew there was a ton of mCherry on them! I think the RFP-Trap is a really nice reagent..."
Prof. Dr. Laura Trinkle-Mulcahy, University of Ottawa
"We have found your trap tools extremely useful, the purification effect is way superior to most of our antibodies. This tool proved very helpful in our research and we are practically addicted on it."
Dr. Ondrej Plihal, Institute of Microbiology, Department of Ecology
"I am a big fan of all GFP/RFP-Trap for Co-IP experiments and we use it regularly. Same thing for the labeled antigen specific nano-bodies."
Dr. Harald Wodrich, University Bordeaux
Only for research applications, not for diagnostic or therapeutic use!