Abstract:
:An oligodeoxyribonucleotide, d(GCTCACAAT-X-ATTGTGAGC), where X represents a hexaethylene glycol chain, was studied using circular dichroism spectroscopy. Its conformation and conformational stability were compared to those of compounds where X was replaced by four thymines and to the duplex of same sequence without loop. The compound with the hexaethylene glycol chain can form a hairpin looped structure as well as a bulged duplex structure. In both cases the duplex region of the oligodeoxyribonucleotide exhibits the same conformation. In similar conditions the oligodeoxyribonucleotide with a four thymines loop forms exclusively a hairpin structure. Comparison between the thermodynamic parameters (delta H, delta S, delta G) associated with the formation of the structure of the three compounds are presented. In the case of the compound with the hexaethylene glycol chain it is shown that the large increase in its melting temperature (by about 35 degrees C in our experimental conditions) when compared to the non looped structure is mainly due to the fact that its melting process is intramolecular (monomolecular) whereas the other one is bimolecular.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Durand M,Chevrie K,Chassignol M,Thuong NT,Maurizot JCdoi
10.1093/nar/18.21.6353subject
Has Abstractpub_date
1990-11-11 00:00:00pages
6353-9issue
21eissn
0305-1048issn
1362-4962journal_volume
18pub_type
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