The BcMag™ Quick Oligo-DNA Conjugation Kit is a powerful tool designed for researchers who need to quickly and efficiently immobilize oligonucleotide DNA to proprietary magnetic beads. The kit uses cross-linker 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) to covalently immobilize amine-modified oligonucleotides to the surface of carboxyl-activated magnetic beads, resulting in a more secure attachment compared to other methods.

Workflow

The workflow for using the BcMag™ Quick Oligo-DNA Conjugation Kit is simple and straightforward. First, the carboxyl-activated magnetic beads are washed and resuspended in a buffer. The amine-modified oligonucleotide is then added to the magnetic bead solution, along with the EDC cross-linker. The reaction is allowed to proceed overnight, during which time the oligonucleotide is covalently immobilized to the magnetic bead surface.

The resulting magnetic bead-oligonucleotide conjugate is then washed and resuspended in buffer, ready for use in downstream applications such as PCR, hybridization, and sequencing.

Features and Advantages

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Quick, Easy, and one-step protocol

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Neutral linkage – Forms neutral amide bonds between carboxyl and amines

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Stable covalent bond with minimal ligand leakage

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High immobilization efficiency

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Scalable – Easily adjusts for sample size and automation

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Reproducible results

Applications

The BcMag™ Quick Oligo-DNA Conjugation Kit is ideal for a wide range of applications, including PCR, hybridization, and sequencing. The resulting magnetic bead-oligonucleotide conjugate can be used for a variety of downstream applications, including RNA and DNA sequencing, mutation detection, and genotyping.

PROTOCOL

The protocol can be scaled appropriately up or down.

Materials Required

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Magnetic Rack (for manual operation)

Based on sample volume, the user can choose one of the following magnetic Racks:

– BcMag™ Rack-2 for holding two individual 1.5 ml centrifuge tubes (Cat. No. MS-01);– BcMag™ Rack-6 for holding six individual 1.5 ml centrifuge tubes (Cat. No. MS-02);– BcMag™ Rack-24 for holding twenty-four individual 1.5-2.0 ml centrifuge tubes (Cat. No. MS-03);– BcMag™ Rack-50 for holding one 50 ml centrifuge tube, one 15 ml centrifuge tube, and four individual 1.5 ml centrifuge tubes (Cat. No. MS-04);– BcMag™ Rack-96 for holding a 96 ELISA plate or PCR plate (Cat. No. MS-05).

For larger scale purification, Ceramic magnets Block for large scale purification (6 in x 4 in x 1 in block ferrite magnet, Applied Magnets, Cat. No. CERAMIC-B8)

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Corning 430825 cell culture flask for large-scale purification (Cole-Parmer, Cat. No. EW-01936-22)

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Mini BlotBoy 3D Rocker, fixed speed, small 10″ x 7.5″ platform w/ flat mat (Benchmark Scientific, Inc. Cat. No. B3D1008) or compatible

A. Oligo-DNA Preparation

1.

The oligo-DNA must be modified with an amino group at either 5’or 3′ end (A commercial oligo synthesis company can provide such service).

Note:

It is strongly recommended that 10-15 extra nucleotides be added to your oligo DNA sequence between the terminal amino group and your DNA sequence to overcome steric hindrance when you design your target oligo–DNA sequence. The oligo-DNA should be purified by standard desalting or other methods.

2.

Resuspend the oligo-DNA in 1x suspension buffer at concentrations of 5-10 µg/ul (Optional: Aspirate 20 µl from the oligo solution, transfer to a new centrifuge tube, and label the tube as C1)

B. Coupling Buffer Preparation

1.

Prepare coupling buffer by adding 19 mg EDC to 1ml of 1x suspension buffer (Coupling buffer must be prepared fresh immediately before use)

C. Coupling

1.

Shake the bottle to resuspend the BcMag Magnetic Beads thoroughly.

2.

Transfer 1ml magnetic beads (20 mg/ml) to a tube. Place the tube on the magnetic Rack for 1-3 minutes. Remove the supernatant while the tube remains on the Rack.

3.

Remove the tube from the Rack and resuspend the beads thoroughly with 1ml suspension buffer. Place the tube on the magnetic Rack for 1-3 minutes. Remove the supernatant while the tube remains on the Rack.

4.

Repeat step 3 once.

5.

Remove the tube from the Rack and resuspend the beads thoroughly with a 200µl coupling buffer. Mix the magnetic beads with 100-200 µg oligo-DNA prepared from Step A.2

6.

Incubate the beads overnight at 50° C with continuous rotation.

7.

Place the tube on a magnetic Rack for 1-3 minutes. Remove the supernatant while the tube remains on the Rack (Optional: Aspirate 20 µl supernatant, transfer to a new centrifuge tube, and label the tube as C2).

8.

Wash the beads three times with 1 ml of washing buffer at room temperature and twice with dH20 at 65° C.

9.

Resuspend the beads at 5 mg/ml in PBS buffer containing 0.2% NaN3 and store them at 4° C.

Coupling Efficiency Calculation

1.

Measure OD at A260

Coupling Efficiency (%) = [(C1-C2)/C1] x 100%

C1: A260 Pre-Coupling oligo DNA Solution x dilution factor; C2: A260 post-Coupling oligo DNA Solution

2.

Using fluorescent dye to quantify C1 and C2.

Learn More

Instruction Manual

MSDS

DNA & RNA Purification Related Products →

General Reference

1.

Ferrier DC, Shaver MP, Hands PJW. Micro- and nano-structure-based oligonucleotide sensors. Biosens Bioelectron. 2015 Jun 15;68:798-810.

2.

Sethi D, Gandhi RP, Kuma P, Gupta KC. Chemical strategies for immobilization of oligonucleotides. Biotechnol J. 2009 Nov;4(11):1513-29.

3.

Zuo P, Ye BC. A novel immobilization strategy using oligonucleotide as linker for small molecule microarrays construction. Biosens Bioelectron. 2008 Jun 15;23(11):1694-700.

Bioclone的BcMag™NHS激活的磁珠是均匀的，基于二氧化硅的超顺磁珠，表面涂有高密度NHS（N-羟基琥珀酰亚胺）官能团。珠子用于特异性地缀合含伯胺的配体（图1），因此在偶联之前不需要保护配体中的其他活性基团。耦合快（室温pH 6.5–9 15–30分钟，4°C 4小时）。BcMag™NHS激活的磁珠最适合与大蛋白结合。建议使用BcMagTM长臂（17 atome）NHS激活的磁珠来缀合小肽，因为长臂（21原子）亲水性接头可以减少空间位阻。