Collective dynamics of EcoRI-DNA complex by elastic network model and molecular dynamics simulations.

Abstract:

:Anisotropic network model (ANM) is used to analyze the collective motions of restriction enzyme EcoRI in free form and in complex with DNA. For comparison, three independent molecular dynamics (MD) simulations, each of 1.5 ns duration, are also performed for the EcoRI-DNA complex in explicit water. Although high mobility (equilibrium fluctuations) of inner and outer loops that surround the DNA is consistent in both methods and experiments, MD runs sample different conformational subspaces from which reliable collective dynamics cannot be extracted. However, ANM employed on different conformations from MD simulations indicates very similar collective motions. The stems of the inner loops are quite immobile even in the free enzyme and form a large, almost fixed, pocket for DNA binding. As a result, the residues that make specific and non-specific interactions with the DNA exhibit very low fluctuations in the free enzyme. The vibrational entropy difference between the EcoRI complex and free protein + unkinked DNA is positive (favorable), which may partially counteract the unfavorable enthalpy difference of DNA kink formation. Dynamic domains in EcoRI complex and cross-correlations between residue fluctuations indicate possible means of communication between the distal active sites.

journal_name

J Biomol Struct Dyn

authors

Doruker P,Nilsson L,Kurkcuoglu O

doi

10.1080/07391102.2006.10507093

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

1-16

issue

1

eissn

0739-1102

issn

1538-0254

pii

d=3024&c=4207&p=15083&do=detail

journal_volume

24

pub_type

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