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Oligo Modifications List | Oligo Modifications Reference Category
Modification : Iodo-dT-5'
Reference Catalog Number 26-6926
Category Minor Bases
Modification Code I-dT
5 Prime Y
3 Prime N
Internal N
Molecular Weight (mw) 414.09
Extinction Coeficient (ec) 8.7
Technical Info (pdf) PS26-6926.pdf
Catalog NoScalePrice
26-6926-0550 nmol$127.50
26-6926-02200 nmol$127.50
26-6926-011 umol$165.75
26-6926-032 umol$248.62
26-6926-1010 umol$1,326.00
26-6926-1515 umol$1,657.50

Discounts are available for Iodo-dT-5'!
Modification* Discount Price Structure
1 site/order List price
2 sites/order 10% discount
3 sites/order 20% discount
4 sites/order 30% discount
5-9 sites/order 50% discount
10+ sites/order 60% discount
*Exceptions apply

Related Modifications
Hexynyl (Alkyne) Modifier (5')
Coumarin Azide
BiotinTEG Azide
Azide C3 3'
Azide-C4 NHS (butyrate)
Halotag Conjugation Bromohexyl (5')
Azide C6 (5')
Azide dT (5')

5'-Iodo dT modification is available as an Azide dT [Catalog #: 26-6719] for Click Chemistry. 5'-Iodo dT modification has a setup charge of $250.00 for mild synthesis reagents per order. Azide version does not have additional charges

Iodo-dT (5') can be used to introduce an active azide group to the 5'-end of an oligonucleotide. The oligo is chemically synthesized with Iodo-dT at the 5' end and then post synthesis converted to an active azide. The oligo is provided as an azide or 5'-iodo. The selection should be indicated in the comments of the order.
The presence of the azide allows the user to use "Click Chemistry" (a [3+2] cycloaddition reaction between alkynes and azides, using copper (I) iodide as a catalyst) to conjugate the azide-modified oligo to a terminal alkyne-modified oligo with extremely high regioselectivity and efficiency (1,2). Preparation of the alkyne-modified oligo can be achieved using the 5'-Hexynyl modifier (see its respective tech sheet for details). Click chemistry can be used to form short, cyclic oligos that can be used as research tools in various biophysical and biological studies (3). In particular, they have considerable potential for in vivo work, as cyclic oligos are known to be very stable in serum for up to several days.

1. Huisgen, R. Angew. Chem. Int. Ed. (1963), 2: 565-568.
2. Rostovtsev, V.V., Green, L.G., Fokin, V.V., Sharpless, K.B. A Stepwise Huisgen Cycloaddition Process: Copper(I)-Catalyzed Regioselective Ligation of Azides and Terminal Alkynes. Angew. Chem. Int. Ed. (2002), 41: 2596-2599.
3. Kumar, R., El-Sagheer, A., Tumpane, J., Lincoln, P., Wilhelmsson, L.M., Brown, T. Template-Directed Oligonucleotide Strand Ligation, Covalent Intramolecular DNA Circularization and Catenation Using Click Chemistry. J. Am. Chem. Soc. (2007), 129: 6859-6864.

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