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Oligo Modifications List | Oligo Modifications Reference Category
Modification : Biotin-SS-NHS-Sulfo
Reference Catalog Number 26-6994
Category Others
Modification Code BiotinSS
5 Prime Y
3 Prime Y
Internal Y
Molecular Weight (mw) 490.91
Technical Info (pdf) PS26-6994.pdf
Catalog NoScalePrice
26-6994-0550 nmol$250.00
26-6994-02200 nmol$250.00
26-6994-011 umol$750.00
26-6994-032 umol$1,150.00
26-6994-1010 umol$5,650.00
26-6994-1515 umol$7,500.00
Related Modifications
Biotin TEG
Desthiobiotin NHS
DesthiobiotinTEG Azide
BiotinTEG Azide
Biotin NHS
Biotin Multi
Biotin dT

Sulfo-NHS-SS-biotin(sulfosuccinimidyl-20(biotinamido)ethyl-1,3-dithiopropionate) is a long-chain cleavable amine-reactive biotinylation reagent. The SS when reduced to SH will cleave the molecule. Biotin-SS-NHS is an N-hydroxysuccinimide ester (NHS ester) of biotin. Biotin-SS-NHS can be used to internally label an oligonucleotide with biotin SS at a base (that is, at a T, G, C, or A position) or a the ends. To accomplish this, amino dT-C6/dG-C6/dC-C6/dA-C6 is first incorporated internally into the oligonucleotide or an amino modifier at the ends, thereby placing an active primary amino group at the desired position. Biotin-SS-NHS is then conjugated to the amino group in a separate reaction to form the final biotin-SS labeled product.

Biotin is an affinity label that can be incorporated at either the 5’- or 3’-end of an oligonucleotide, or at an internal position. Biotin has a high affinity for the bacterial protein, streptavidin, which can be conjugated to a solid support (such as magnetic beads) for use as a capture and immobilization medium for a biotinylated oligo. In the biotin phosphoramidite, the biotin is attached to a long spacer arm, which acts to minimize steric hindrance between the biotin moiety and the oligo, thereby providing streptavidin easy access to the biotin. Biotinylated oligos are most commonly used as probes or primers in a variety of in vitro and in vivo applications.

Besides their importance as nucleic acid probes, biotinylated oligonucleotides are also useful for the purification of DNA binding proteins. In this context, the biotinylated oligonucleotide can be bound to a streptavidin matrix and used for either column or spin chromatography. For isolation of DNA binding proteins, the streptavidin-biotin-oligonucleotide complex is incubated with a crude cell extract containing nuclear proteins. Following appropriate washes, the proteins that bind selectively to the oligonucleotide sequence can be eluted under conditions that disrupt the protein:DNA complex. Because the binding of biotin to streptavidin is essentially irreversible and is resistant to chaotropic agents and extremes of pH and ionic strength, the elution conditions can be relatively stringent.

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