456d

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{{STRUCTURE_456d| PDB=456d | SCENE= }}
{{STRUCTURE_456d| PDB=456d | SCENE= }}
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'''MOLECULAR AND CRYSTAL STRUCTURE OF D(CGCGMO6AATCCGCG): THE WATSON-CRICK TYPE N6-METHOXYADENOSINE/CYTIDINE BASE-PAIRS IN B-DNA'''
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===MOLECULAR AND CRYSTAL STRUCTURE OF D(CGCGMO6AATCCGCG): THE WATSON-CRICK TYPE N6-METHOXYADENOSINE/CYTIDINE BASE-PAIRS IN B-DNA===
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==Overview==
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Oxyamines such as hydroxylamine and methoxylamine disturb DNA replication and act as potent mutagens, causing nucleotide transition from one purine to another or one pyrimidine to another. In order to investigate mismatch base-pairing in DNA damaged with oxyamines, a dodecamer with the sequence d(CGCGmo(6)AATCCGCG), where mo(6) A is 2'-deoxy-N(6)-methoxyadenosine, was synthesized and its crystal structure determined. No significant conformational changes are found between the present dodecamer and the original undamaged B-form dodecamer. Electron density maps clearly show that the mo(6)A residue forms a base-pair with a 2'-deoxycytidine residue through hydrogen bonds similar to a Watson-Crick G.C base-pair. For these hydrogen bonds to be made, N(6)-methoxyadenine must chemically take the imino form. The methoxylation thus enables the adenine base to mimic a guanine base. As a result, misincorporation of 2'-deoxycytidine instead of thymidine, or 2'-deoxyadenosine instead of 2'-deoxyguanosine, can occur in DNA replication.
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(as it appears on PubMed at http://www.pubmed.gov), where 10600379 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10600379}}
==About this Structure==
==About this Structure==
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[[Category: Mismatch]]
[[Category: Mismatch]]
[[Category: Modified nucleotide]]
[[Category: Modified nucleotide]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 13:22:21 2008''

Revision as of 10:22, 3 July 2008

Image:456d.png

Template:STRUCTURE 456d

MOLECULAR AND CRYSTAL STRUCTURE OF D(CGCGMO6AATCCGCG): THE WATSON-CRICK TYPE N6-METHOXYADENOSINE/CYTIDINE BASE-PAIRS IN B-DNA

Template:ABSTRACT PUBMED 10600379

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystallographic studies on damaged DNAs. I. An N(6)-methoxyadenine residue forms a Watson-Crick pair with a cytosine residue in a B-DNA duplex., Chatake T, Ono A, Ueno Y, Matsuda A, Takenaka A, J Mol Biol. 1999 Dec 17;294(5):1215-22. PMID:10600379

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