133d

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{{STRUCTURE_133d| PDB=133d | SCENE= }}
{{STRUCTURE_133d| PDB=133d | SCENE= }}
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'''THE CRYSTAL STRUCTURE OF N4-METHYLCYTOSINE.GUANOSIN BASE-PAIRS IN THE SYNTHETIC HEXANUCLEOTIDE D(CGCGM(4)CG)'''
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===THE CRYSTAL STRUCTURE OF N4-METHYLCYTOSINE.GUANOSIN BASE-PAIRS IN THE SYNTHETIC HEXANUCLEOTIDE D(CGCGM(4)CG)===
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==Overview==
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The structure of d(CGCGm4CG) were m4C = N4-methylcytosine has been determined by crystallographic methods. The crystals are multifaced prisms, with orthorhombic space group P2(1)2(1)2(1) and unit cell dimensions of a = 17.98, b = 30.77 and c = 44.75A. The asymmetric unit consists of one duplex of hexanucleotide and 49 waters. The R-factor is 0.189 for 1495 reflections with F &gt; or = sigma(F) to a resolution limit of 1.8A. The double helix has a Z-DNA type structure which appears to be intermediate in structure to the two previously characterised structure types for Z-DNA hexamers. The two m4C.G base-pairs adopt structures that are very similar to those of the equivalent base-pairs in the structure of the native sequence d(CGCGCG) except for the presence of the methyl groups which are trans to the N3 atoms of their parent nucleotides and protrude into the solvent region. The introduction of the modified base-pairs into the d(CGCGCG) duplex appears to have a minimal effect on the overall base-pair morphology of the Z-DNA duplex.
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(as it appears on PubMed at http://www.pubmed.gov), where 8284207 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8284207}}
==About this Structure==
==About this Structure==
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[[Category: Modified]]
[[Category: Modified]]
[[Category: Z-dna]]
[[Category: Z-dna]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:28:56 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 15:27:50 2008''

Revision as of 12:27, 30 June 2008

Template:STRUCTURE 133d

THE CRYSTAL STRUCTURE OF N4-METHYLCYTOSINE.GUANOSIN BASE-PAIRS IN THE SYNTHETIC HEXANUCLEOTIDE D(CGCGM(4)CG)

Template:ABSTRACT PUBMED 8284207

About this Structure

Full crystallographic information is available from OCA.

Reference

The crystal structure of N4-methylcytosine.guanosine base-pairs in the synthetic hexanucleotide d(CGCGm4CG)., Cervi AR, Guy A, Leonard GA, Teoule R, Hunter WN, Nucleic Acids Res. 1993 Dec 11;21(24):5623-9. PMID:8284207

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