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2gyx

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{{STRUCTURE_2gyx| PDB=2gyx | SCENE= }}
{{STRUCTURE_2gyx| PDB=2gyx | SCENE= }}
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'''Crystal structure of DB884- D(CGCGAATTCGCG)2 complex at 1.86 A resolution.'''
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===Crystal structure of DB884- D(CGCGAATTCGCG)2 complex at 1.86 A resolution.===
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==Overview==
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To better understand the molecular basis for recognition of the DNA minor groove by heterocyclic cations, a series of "reversed amidine" substituted heterocycles has been prepared. Amidine derivatives for targeting the minor groove have the amidine carbon linked to a central heterocyclic system, whereas in the reverse orientation, an amidine nitrogen provides the link. The reverse system has a larger dihedral angle as well as a modified spatial relationship with the groove relative to amidines. Because of the large dihedral, the reversed amidines should have reduced binding to DNA relative to similar amidines. Such a reduction is observed in footprinting, circular dichroism (CD), biosensor-surface plasmon resonance (SPR), and isothermal titration calorimetric (ITC) experiments with DB613, which has a central phenyl-furan-phenyl heterocyclic system. The reduction is not seen when a pyrrole (DB884) is substituted for the furan. Analysis of a number of derivatives defines the pyrrole and a terminal phenyl substituent on the reversed amidine groups as critical components in the strong binding of DB884. ITC and SPR comparisons showed that the better binding of DB884 was due to a more favorable binding enthalpy and that it had exceptionally slow dissociation from DNA. Crystallographic analysis of DB884 bound to an AATT site shows that the compound was bound in the minor groove in a 1:1 complex as suggested by CD solution studies. Surprisingly, unlike the amidine derivative, the pyrrole -NH of DB884 formed an H-bond with a central T of the AATT site and this accounts for the enthalpy-driven strong binding. The structural results and molecular modeling studies provide an explanation for the differences in binding affinities for related amidine and reversed amidine analogues.
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(as it appears on PubMed at http://www.pubmed.gov), where 17425312 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17425312}}
==About this Structure==
==About this Structure==
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:40:09 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:10:59 2008''

Revision as of 14:11, 27 July 2008

Image:2gyx.png

Template:STRUCTURE 2gyx

Crystal structure of DB884- D(CGCGAATTCGCG)2 complex at 1.86 A resolution.

Template:ABSTRACT PUBMED 17425312

About this Structure

Full crystallographic information is available from OCA.

Reference

Induced fit conformational changes of a "reversed amidine" heterocycle: optimized interactions in a DNA minor groove complex., Munde M, Lee M, Neidle S, Arafa R, Boykin DW, Liu Y, Bailly C, Wilson WD, J Am Chem Soc. 2007 May 2;129(17):5688-98. Epub 2007 Apr 11. PMID:17425312

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