'''NMR STRUCTURE OF THE 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE (PHIP) C8-DEOXYGUANOSINE ADDUCT IN DUPLEX DNA'''
===NMR STRUCTURE OF THE 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE (PHIP) C8-DEOXYGUANOSINE ADDUCT IN DUPLEX DNA===
==Overview==
<!--
The carcinogenic heterocyclic amine (HA) 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is formed during the cooking of various meats. To enable structure/activity studies aimed at understanding how DNA damaged by a member of the HA class of compounds can ultimately lead to cancer, we have determined the first solution structure of an 11-mer duplex containing the C8-dG adduct formed by reaction with N-acetoxy-PhIP. A slow conformational exchange is observed in which the PhIP ligand either intercalates into the DNA helix by denaturing and displacing the modified base pair (main form) or is located outside the helix in a minimally perturbed B-DNA duplex (minor form). In the main base-displaced intercalation structure, the minor groove is widened, and the major groove is compressed at the lesion site because of the location of the bulky PhIP-N-methyl and phenyl ring in the minor groove; this distortion causes significant bending of the helix. The PhIP phenyl ring interacts with the phosphodiester-sugar ring backbone of the complementary strand and its fast rotation with respect to the intercalated imidazopyridine ring causes substantial distortions at this site, such as unwinding and bulging-out of the strand. The glycosidic torsion angle of the [PhIP]dG residue is syn, and the displaced guanine base is directed toward the 3' end of the modified strand. This study contributes, to our knowledge, the first structural information on the biologically relevant HA class to a growing body of knowledge about how conformational similarities and differences for a variety of types of lesions can influence protein interactions and ultimately biological outcome.
The line below this paragraph, {{ABSTRACT_PUBMED_11438709}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 11438709 is the PubMed ID number.
-->
{{ABSTRACT_PUBMED_11438709}}
==About this Structure==
==About this Structure==
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HZ0 OCA].
Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HZ0 OCA].
==Reference==
==Reference==
Line 23:
Line 27:
[[Category: Cosman, M.]]
[[Category: Cosman, M.]]
[[Category: Dna adduct duplex]]
[[Category: Dna adduct duplex]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:22:53 2008''
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:09:18 2008''
Revision as of 10:09, 1 July 2008
This article has been automatically seeded. Changes to this page should pertain to the PDB entry only and not to the protein or biomolecule in general.
NMR STRUCTURE OF THE 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE (PHIP) C8-DEOXYGUANOSINE ADDUCT IN DUPLEX DNANMR STRUCTURE OF THE 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE (PHIP) C8-DEOXYGUANOSINE ADDUCT IN DUPLEX DNA
Full experimental information is available from OCA.
ReferenceReference
Solution structure of the 2-amino-1- methyl-6-phenylimidazo[4,5-b]pyridine C8-deoxyguanosine adduct in duplex DNA., Brown K, Hingerty BE, Guenther EA, Krishnan VV, Broyde S, Turteltaub KW, Cosman M, Proc Natl Acad Sci U S A. 2001 Jul 17;98(15):8507-12. Epub 2001 Jul 3. PMID:11438709
