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Query: EC:6.5.1.2 (DNA ligase)
 2,749 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Chemical and enzymatic ligation between the 5'-terminal phosphate of one oligonucleotide and the 3'-terminal 2',3'-cis-diol group of the other oligonucleotide on a complementary template was studied. Carbodiimide, imidazolide and N-hydroxybenzotriazole ester methods were used for chemical activation of the phosphate group, and T4 DNA ligase for enzymatic ligation. All the chemical activation methods produced 3',5'- and 2',5'-phosphodiester bonds (40-45 and 55-60%, resp.), whereas enzymatic ligation gave the product only with 3',5'-phosphodiester bond.
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PMID:[Chemical reactions in double-stranded nucleic acids. The nature of the bond formed during chemical ligation using a cis-diol group]. 367 53

Two self-complementary decadeoxyribonucleotides TAATGC*ATTA (where C* is a derivative of 5-methyl cytosine with a carboxy- or aminofunction attached through a spacer to the exocyclic amino group) were synthesized. Carbodiimide induced condensation of the amino and carboxyl groups in the opposite strands to give the crosslinks with a yield up to 20%. Cross-linking of two opposite strands in the duplex formed by the self-complementary aliphatic amino group-containing decanucleotide was performed with the use of glutaric aldehyde with a similar efficiency. The structure of the dimers obtained and position of the crosslinks were confirmed by the Maxam--Gilbert method. Efficiencies of the T4 DNA ligase-induced polycondensations of the double-stranded modified decanucleotides and of the cross-linked products differed significantly.
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PMID:[Chemical reactions in double-helical nucleic acids. XVI. Synthesis of DNA-duplexes containing regularly repeating transverse covalent cross- links]. 816 62