Tracts of A.T base pairs retard the electrophoretic mobility of short DNA duplexes.

Abstract:

:An investigation of the mobility of short duplexes of DNA -octamers and decamers-on polyacrylamide gels is presented, showing that molecules containing less than one helical turn exhibit sequence dependent mobilities. Analysis of chains with different sequences indicates that any arrangement of two or more adjacent A.T base pairs causes a duplex to move more slowly than does any combination of isolated A.T pairs This behavior appears to be an intrinsic property of these sequences, since the anomaly persists in the absence of magnesium or presence of spermine and is not due to strand dissociation. In two decamers we studied, the position of A.T tracts within a duplex can be shown to influence mobility: the sequence GA4T4C associated with bending or curvature of the helix axis when ligated into polymers migrates more slowly than the corresponding sequence GT4A4C, polymers of which migrate as linear B DNA.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Chen JH,Seeman NC,Kallenbach NR

doi

10.1093/nar/16.14.6803

subject

Has Abstract

pub_date

1988-07-25 00:00:00

pages

6803-12

issue

14B

eissn

0305-1048

issn

1362-4962

journal_volume

16

pub_type

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