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Sequence specificity of Z-DNA formation in oligonucleotides

Kadalayil, L.P.; Majumder, K.; Mishra, R.K.; Brahmachari, S.K.

Biochemistry International 17(1): 121-131

1988

ISSN/ISBN: 0158-5231
PMID: 3263858
Document Number: 314227
The sequence specific requirement for B----Z transition in solution was examined in d(CGTGCGCACG), d(CGTACGTACG), d(ACGTACGT) in presence of various Z-inducing factors. Conformational studies show that inspite of the alternating nature of purines and pyrimidines, the aforementioned sequences do not undergo B----Z transition under the influence of NaCl, hexamine cobalt chloride and ethanol. A comparison with the crystal structures of an assorted array of purine and pyrimidine sequences show that the sequence requirement for B----Z transition is much more stringent in solution as compared to the solid state. The disruptive influence of AT base pairs in B to Z transition is discussed.

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