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331d
From Proteopedia
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[[Image:331d.gif|left|200px]] | [[Image:331d.gif|left|200px]] | ||
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| - | + | {{STRUCTURE_331d| PDB=331d | SCENE= }} | |
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'''CRYSTAL STRUCTURE OF D(GCGCGCG) WITH 5'-OVERHANG G'S''' | '''CRYSTAL STRUCTURE OF D(GCGCGCG) WITH 5'-OVERHANG G'S''' | ||
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==About this Structure== | ==About this Structure== | ||
| - | + | Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=331D OCA]. | |
==Reference== | ==Reference== | ||
Crystal structure of d(GCGCGCG) with 5'-overhang G residues., Pan B, Ban C, Wahl MC, Sundaralingam M, Biophys J. 1997 Sep;73(3):1553-61. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9284322 9284322] | Crystal structure of d(GCGCGCG) with 5'-overhang G residues., Pan B, Ban C, Wahl MC, Sundaralingam M, Biophys J. 1997 Sep;73(3):1553-61. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9284322 9284322] | ||
| - | [[Category: Protein complex]] | ||
[[Category: Ban, C.]] | [[Category: Ban, C.]] | ||
[[Category: Pan, B.]] | [[Category: Pan, B.]] | ||
[[Category: Sundaralingam, M.]] | [[Category: Sundaralingam, M.]] | ||
[[Category: Wahl, M.]] | [[Category: Wahl, M.]] | ||
| - | [[Category: | + | [[Category: Double helix]] |
| - | [[Category: | + | [[Category: Flipped-out base]] |
| - | [[Category: | + | [[Category: Overhanging base]] |
| - | [[Category: | + | [[Category: Z-dna]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 20:16:05 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 17:16, 4 May 2008
CRYSTAL STRUCTURE OF D(GCGCGCG) WITH 5'-OVERHANG G'S
Overview
The crystal structure of the DNA heptamer d(GCGCGCG) has been solved at 1.65 A resolution by the molecular replacement method and refined to an R-value of 0.184 for 3598 reflections. The heptamer forms a Z-DNA d(CGCGCG)2 with 5'-overhang G residues instead of an A-DNA d(GCGCGC)2 with 3'-overhang G residues. The overhang G residues from parallel strands of two adjacent duplexes form a trans reverse Hoogsteen G x G basepair that stacks on the six Z-DNA basepairs to produce a pseudocontinuous helix. The reverse Hoogsteen G x G basepair is unusual in that the displacement of one G base relative to the other allows them to participate in a bifurcated (G1)N2 . . . N7(G8) and an enhanced (G8)C8-H . . . O6(G1) hydrogen bond, in addition to the two usual hydrogen bonds. The 5'-overhang G residues are anti and C2'-endo while the 3'-terminal G residues are syn and C2'-endo. The conformations of both G residues are different from the syn/C3'-endo for the guanosine in a standard Z-DNA. The two cobalt hexammine ions bind to the phosphate groups in both GpC and CpG steps in Z(I) and Z(II) conformations. The water structure motif is similar to the other Z-DNA structures.
About this Structure
Full crystallographic information is available from OCA.
Reference
Crystal structure of d(GCGCGCG) with 5'-overhang G residues., Pan B, Ban C, Wahl MC, Sundaralingam M, Biophys J. 1997 Sep;73(3):1553-61. PMID:9284322 Page seeded by OCA on Sun May 4 20:16:05 2008
