A duplex of the oligonucleotides d(GGGGGTTTTT) and d(AAAAACCCCC) forms an A to B conformational junction in concentrated salt solutions.

Abstract:

:The coexistence of both A form and B form tracts and formation of an A-B junction in the oligomer d(GGGGGTTTTT).d(AAAAACCCCC) in saturated sodium chloride solution have been detected by Raman spectroscopy. The entire duplex adopts the familiar B-form conformation in aqueous solution at low salt concentrations (0.1M NaCl). In 6M NaCl the adoption of an A form is observed within the G,C tract while a B-form is maintained in the A.T tract. The experimental results indicate that two different helical forms can co-exist in a rather short oligonucleotide and that formation of an A-B junction can occur over a fairly small span of bases. This is in agreement with recent rules governing the relation between base sequence and secondary structure of DNA published from this laboratory. The conformational preferences of each of the individual oligomers d(AAAAACCCCC) and d(GGGGGTTTTT) have also been investigated. The oligomer d(AAAAACCCCC) is single stranded but some evidence for base stacking is observed at 2 degrees C. In contrast, a double stranded B-form structure characterized by wobble G-T base pairing is observed for d(GGGGGTTTTT) in 0.1M and 6M NaCl.

journal_name

J Biomol Struct Dyn

authors

Wang Y,Thomas GA,Peticolas WL

doi

10.1080/07391102.1989.10506543

subject

Has Abstract

pub_date

1989-06-01 00:00:00

pages

1177-87

issue

6

eissn

0739-1102

issn

1538-0254

journal_volume

6

pub_type

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