On the Mechanism of Intramolecular Sensitization of Photocleavage of the 2-(2-Nitrophenyl)propoxycarbonyl (NPPOC) Protecting Group
摘要:
A spectroscopic study of a variety of covalently linked thioxanthone(TX)-linker-2-(2-nitrophenyl)propoxycarbonyl(NPPOC)-substrate conjugates is presented. Herein, the TX chromophore functions as an intramolecular sensitizer to the NPPOC moiety, a photolabile protecting group used in photolithographic DNA chip synthesis. The rate of electronic energy transfer between TX and NPPOC was quantified by means of stationary fluorescence as well as nanosecond and femtosecond time-resolved laser spectroscopy. A dual mechanism of triplet-triplet energy transfer has been observed comprising a slower mechanism involving the Ti(pi pi*) state of TX with linker-length-dependent time constants longer than 20 ns and a fast mechanism with linker-length-dependent time constants shorter than 3 ns. Evidence is provided that the latter mechanism is due to energy transfer from the T-2(n pi*) state which is in fast equilibrium with the fluorescent S-1(pi pi*) state. In the case of direct linkage between the aromatic rings of TX and NPPOC, the spectroscopic properties are indicative of one united chromophore which, however, still shows the typical NPPOC cleavage reaction triggered by intramolecular hydrogen atom transfer to the nitro group.
Method for covalently attaching nucleosides and/or nucleotides on surfaces and method for determining coupling yields in the synthesis of nucleotides
申请人:Stengele Klaus-Peter
公开号:US20060154256A1
公开(公告)日:2006-07-13
The present invention relates to a method for covalently attaching nucleosides and/or nucleotides on surfaces having reactive functional groups, where in a first step, the reactive functional groups are made to react with suitable derivatized nucleosides and/or nucleotides, and in a second step, they are converted with a protecting group reagent, so that a reaction product of the consecutive reaction interacts with electromagnetic radiation such that it can be quantitatively determined. The invention also relates to a method for determining the repetitive coupling yields in the synthesis of nucleotides where the free 3′ or 5′ hydroxy group of a selected nucleoside and/or nucleotide is converted with a compound of formula (I)
where L is a common suitable leaving group, the motif O—PX represents a phosphor amidite, a H-phosphonate a phosphonic acid ester, a phosphotriester, Y═O or S, N is a nucleoside or a nucleotide derivative which subsequently reacts further with a protecting group reagent and the elimination of the leaving group (L), which is subsequently further eliminated. The quantity of the leaving group (L) eliminated in step b) is quantitatively determined in the form of its anion (L
−
) by means of optical spectroscopy.
METHOD FOR COVALENTLY ATTACHING NUCLEOSIDES AND/OR NUCLEOTIDES ON SURFACES AND METHOD FOR DETERMINING COUPLING YIELDS IN THE SYNTHESIS OF NUCLEOTIDES
申请人:Chemogenix GmbH
公开号:EP1438322A2
公开(公告)日:2004-07-21
[EN] METHOD FOR COVALENTLY ATTACHING NUCLEOSIDES AND/OR NUCLEOTIDES ON SURFACES AND METHOD FOR DETERMINING COUPLING YIELDS IN THE SYNTHESIS OF NUCLEOTIDES<br/>[FR] PROCEDE DE FIXATION COVALENTE DE NUCLEOSIDES ET/OU NUCLEOTIDES SUR DES SURFACES, ET PROCEDE DE DETECTION DE RENDEMENTS DE COUPLAGE DANS LA SYNTHESE DE NUCLEOTIDES
申请人:CHEMOGENIX GMBH
公开号:WO2003035664A2
公开(公告)日:2003-05-01
The present invention relates to a method for covalently attaching nucleosides and/or nucleotides on surfaces having reactive functional groups, where in a first step, the reactive functional groups are made to react with suitable derivatized nucleosides and/or nucleotides, and in a second step, they are converted with a protecting group reagent, so that a reaction product of the consecutive reaction interacts with electromagnetic radiation such that it can be quantitatively determined. The invention also relates to a method for determining the repetitive coupling yields in the synthesis of nucleotides where the free 3' or 5' hydroxy group of a selected nucleoside and/or nucleotide is converted with a compound of formula (I), where L is a common suitable leaving group, the motif O-PX represents a phosphor amidite, a H-phosphonate a phosphonic acid ester, a phosphotriester, Y = O or S, N is a nucleoside or a nucleotide derivative which subsequently reacts further with a protecting group reagent and the elimination of the leaving group (L), which is subsequently further eliminated. The quantity of the leaving group (L) eliminated in step b) is quantitatively determined in the form of its anion (L-) by means of optical spectroscopy.
[EN] METHOD FOR THE INTRAMOLECULAR ENERGY TRANSFER FOR THE CLEAVAGE OF LABILE FUNCTIONAL GROUP FROM BIOMOLECULES AND THE PROTECTED BIOMOLECULES<br/>[FR] PROCEDE DE TRANSFERT D'ENERGIE INTRAMOLECULAIRE UTILISE POUR LE CLIVAGE DE GROUPES FONCTIONNELS LABILES HORS DE BIOMOLECULES ET BIOMOLECULES PROTEGEES
申请人:STEINER ULRICH
公开号:WO2004089529A1
公开(公告)日:2004-10-21
The present invention provides a chemical compound and a method for the cleavage of labile functional groups from molecules by the interaction of electromagnetic radiation by the use of the chemical compound. Further, the invention provides a method for the manufacture of DNA chips by spatially addressed light directed nucleotide synthesis on solid substrates. The cleavage of the labile functional group is achieved by intramolecular energy transfer of the excitation energy.
Solid-Phase Oligodeoxynucleotide Synthesis: A Two-Step Cycle Using Peroxy Anion Deprotection
作者:Agnieszka B. Sierzchala、Douglas J. Dellinger、Jason R. Betley、Tadeusz K. Wyrzykiewicz、Christina M. Yamada、Marvin H. Caruthers
DOI:10.1021/ja030376n
日期:2003.11.1
phosphoramidite based oligodeoxynucleotide two-step synthesismethod has been developed. Keys to this method are replacement of the 5'-dimethoxytrityl blocking group with an aryloxycarbonyl and the use of N-dimethoxytrityl protection for the exocyclic amines of adenine and cytosine. With these modifications, coupling of each 2'-deoxynucleoside 3'-phosphoramidite to the growing oligodeoxynucleotide