[{"month":"10","has_accepted_license":"1","article_type":"original","publication_identifier":{"issn":["1399-0047"]},"year":"2015","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","OA_type":"closed access","date_created":"2026-01-29T21:56:58Z","date_updated":"2026-02-23T09:09:14Z","doi":"10.1107/s1399004715013930","page":"2119-2126","author":[{"first_name":"Arunachalam","full_name":"Thirugnanasambandam, Arunachalam","last_name":"Thirugnanasambandam"},{"last_name":"Karthik","first_name":"Selvam","full_name":"Karthik, Selvam"},{"full_name":"Mandal, Pradeep K","first_name":"Pradeep K","orcid":"0000-0001-5996-956X","id":"6a3def15-d4b4-11ef-9fa9-a24c1f545ec3","last_name":"Mandal"},{"first_name":"Namasivayam","full_name":"Gautham, Namasivayam","last_name":"Gautham"}],"title":"The novel double-folded structure of d(GCATGCATGC): A possible model for triplet-repeat sequences","oa_version":"None","publisher":"International Union of Crystallography","issue":"10","article_processing_charge":"No","publication":"Acta Crystallographica Section D Structural Biology","publication_status":"published","_id":"21103","volume":71,"abstract":[{"lang":"eng","text":"The structure of the decadeoxyribonucleotide d(GCATGCATGC) is presented at a resolution of 1.8 Å. The decamer adopts a novel double-folded structure in which the direction of progression of the backbone changes at the two thymine residues. Intra-strand stacking interactions (including an interaction between the endocylic O atom of a ribose moiety and the adjacent purine base), hydrogen bonds and cobalt-ion interactions stabilize the double-folded structure of the single strand. Two such double-folded strands come together in the crystal to form a dimer. Inter-strand Watson–Crick hydrogen bonds form four base pairs. This portion of the decamer structure is similar to that observed in other previously reported oligonucleotide structures and has been dubbed a `bi-loop'. Both the double-folded single-strand structure, as well as the dimeric bi-loop structure, serve as starting points to construct models for triplet-repeat DNA sequences, which have been implicated in many human diseases."}],"extern":"1","quality_controlled":"1","language":[{"iso":"eng"}],"status":"public","date_published":"2015-10-01T00:00:00Z","day":"01","citation":{"mla":"Thirugnanasambandam, Arunachalam, et al. “The Novel Double-Folded Structure of d(GCATGCATGC): A Possible Model for Triplet-Repeat Sequences.” <i>Acta Crystallographica Section D Structural Biology</i>, vol. 71, no. 10, International Union of Crystallography, 2015, pp. 2119–26, doi:<a href=\"https://doi.org/10.1107/s1399004715013930\">10.1107/s1399004715013930</a>.","short":"A. Thirugnanasambandam, S. Karthik, P.K. Mandal, N. Gautham, Acta Crystallographica Section D Structural Biology 71 (2015) 2119–2126.","chicago":"Thirugnanasambandam, Arunachalam, Selvam Karthik, Pradeep K Mandal, and Namasivayam Gautham. “The Novel Double-Folded Structure of d(GCATGCATGC): A Possible Model for Triplet-Repeat Sequences.” <i>Acta Crystallographica Section D Structural Biology</i>. International Union of Crystallography, 2015. <a href=\"https://doi.org/10.1107/s1399004715013930\">https://doi.org/10.1107/s1399004715013930</a>.","ieee":"A. Thirugnanasambandam, S. Karthik, P. K. Mandal, and N. Gautham, “The novel double-folded structure of d(GCATGCATGC): A possible model for triplet-repeat sequences,” <i>Acta Crystallographica Section D Structural Biology</i>, vol. 71, no. 10. International Union of Crystallography, pp. 2119–2126, 2015.","ama":"Thirugnanasambandam A, Karthik S, Mandal PK, Gautham N. The novel double-folded structure of d(GCATGCATGC): A possible model for triplet-repeat sequences. <i>Acta Crystallographica Section D Structural Biology</i>. 2015;71(10):2119-2126. doi:<a href=\"https://doi.org/10.1107/s1399004715013930\">10.1107/s1399004715013930</a>","ista":"Thirugnanasambandam A, Karthik S, Mandal PK, Gautham N. 2015. The novel double-folded structure of d(GCATGCATGC): A possible model for triplet-repeat sequences. Acta Crystallographica Section D Structural Biology. 71(10), 2119–2126.","apa":"Thirugnanasambandam, A., Karthik, S., Mandal, P. K., &#38; Gautham, N. (2015). The novel double-folded structure of d(GCATGCATGC): A possible model for triplet-repeat sequences. <i>Acta Crystallographica Section D Structural Biology</i>. International Union of Crystallography. <a href=\"https://doi.org/10.1107/s1399004715013930\">https://doi.org/10.1107/s1399004715013930</a>"},"intvolume":"        71","type":"journal_article"}]