Bending modes of DNA directly addressed by cryo-electron microscopy of DNA minicircles.

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State: Public
Version: Final published version
Serval ID
serval:BIB_BC7848C64B2B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Bending modes of DNA directly addressed by cryo-electron microscopy of DNA minicircles.
Journal
Nucleic Acids Research
Author(s)
Demurtas D., Amzallag A., Rawdon E.J., Maddocks J.H., Dubochet J., Stasiak A.
ISSN
1362-4962[electronic], 0305-1048[linking]
Publication state
Published
Issued date
2009
Peer-reviewed
Oui
Volume
37
Number
9
Pages
2882-2893
Language
english
Notes
Publication types: Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
Publication Status: ppublish
Abstract
We use cryo-electron microscopy (cryo-EM) to study the 3D shapes of 94-bp-long DNA minicircles and address the question of whether cyclization of such short DNA molecules necessitates the formation of sharp, localized kinks in DNA or whether the necessary bending can be redistributed and accomplished within the limits of the elastic, standard model of DNA flexibility. By comparing the shapes of covalently closed, nicked and gapped DNA minicircles, we conclude that 94-bp-long covalently closed and nicked DNA minicircles do not show sharp kinks while gapped DNA molecules, containing very flexible single-stranded regions, do show sharp kinks. We corroborate the results of cryo-EM studies by using Bal31 nuclease to probe for the existence of kinks in 94-bp-long minicircles.
Keywords
Algorithms, Cryoelectron Microscopy, Cyclization, DNA, Circular/chemistry, DNA, Circular/metabolism, Endodeoxyribonucleases/metabolism, Nucleic Acid Conformation
Pubmed
Web of science
Open Access
Yes
Create date
18/06/2009 14:34
Last modification date
20/08/2019 15:30
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