1bqj
From Proteopedia
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|PDB= 1bqj |SIZE=350|CAPTION= <scene name='initialview01'>1bqj</scene>, resolution 2.200Å | |PDB= 1bqj |SIZE=350|CAPTION= <scene name='initialview01'>1bqj</scene>, resolution 2.200Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= | + | |LIGAND= <scene name='pdbligand=DA:2'-DEOXYADENOSINE-5'-MONOPHOSPHATE'>DA</scene>, <scene name='pdbligand=DC:2'-DEOXYCYTIDINE-5'-MONOPHOSPHATE'>DC</scene>, <scene name='pdbligand=DT:THYMIDINE-5'-MONOPHOSPHATE'>DT</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1bqj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bqj OCA], [http://www.ebi.ac.uk/pdbsum/1bqj PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1bqj RCSB]</span> | ||
}} | }} | ||
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[[Category: human telomeric fragment]] | [[Category: human telomeric fragment]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:06:12 2008'' |
Revision as of 16:06, 30 March 2008
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| , resolution 2.200Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CRYSTAL STRUCTURE OF D(ACCCT)
Overview
The crystal structure of d(ACCCT), solved by molecular replacement, shows a four-stranded i-motif conformation, where two parallel duplexes intercalate with one another in opposite orientations. Each duplex is stabilized by hemi-protonated C-C+ base pairing between parallel strands, and a string of water molecules bridge the cytosine N4 atoms to phosphate O atoms. This structure of d(ACCCT) shows examples of reversed Hoogsteen and Watson-Crick base pairing in both intermolecular and intramolecular manners to stabilize the tetraplex. Noticeably, the four-stranded complex is further stabilized at one end by a three-base hydrogen-bonding network, in which two adenines and a thymine form four hydrogen bonds via a reverse Hoogsteen and an asymmetric adenine-adenine base pairing. The structure of d(ACCCT) shows a similar local structure to that found in the d(TAA) part of the crystal structure of d(TAACCC) and provides further structural evidence that these base arrangements are essential for stabilizing these novel DNA super-secondary structures.
About this Structure
1BQJ is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
Stabilization of the i-motif by intramolecular adenine-adenine-thymine base triple in the structure of d(ACCCT)., Weil J, Min T, Yang C, Wang S, Sutherland C, Sinha N, Kang C, Acta Crystallogr D Biol Crystallogr. 1999 Feb;55(Pt 2):422-9. PMID:10089350
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