1mf5
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:1mf5.gif|left|200px]] | [[Image:1mf5.gif|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_1mf5", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | | | + | or leave the SCENE parameter empty for the default display. |
| - | | | + | --> |
| - | + | {{STRUCTURE_1mf5| PDB=1mf5 | SCENE= }} | |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''GCATGCT Quadruplex''' | '''GCATGCT Quadruplex''' | ||
| Line 19: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
| - | + | Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MF5 OCA]. | |
==Reference== | ==Reference== | ||
Crystal structure of the complementary quadruplex formed by d(GCATGCT) at atomic resolution., Thorpe JH, Teixeira SC, Gale BC, Cardin CJ, Nucleic Acids Res. 2003 Feb 1;31(3):844-9. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12560479 12560479] | Crystal structure of the complementary quadruplex formed by d(GCATGCT) at atomic resolution., Thorpe JH, Teixeira SC, Gale BC, Cardin CJ, Nucleic Acids Res. 2003 Feb 1;31(3):844-9. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12560479 12560479] | ||
| - | [[Category: Protein complex]] | ||
[[Category: Cardin, C J.]] | [[Category: Cardin, C J.]] | ||
[[Category: Gale, B C.]] | [[Category: Gale, B C.]] | ||
[[Category: Teixeira, S C.M.]] | [[Category: Teixeira, S C.M.]] | ||
[[Category: Thorpe, J H.]] | [[Category: Thorpe, J H.]] | ||
| - | [[Category: | + | [[Category: Atomic resolution]] |
| - | [[Category: | + | [[Category: Quadruplex]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:57:42 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 21:57, 2 May 2008
GCATGCT Quadruplex
Overview
Here we report the crystal structure of the DNA heptanucleotide sequence d(GCATGCT) determined to a resolution of 1.1 A. The sequence folds into a complementary loop structure generating several unusual base pairings and is stabilised through cobalt hexammine and highly defined water sites. The single stranded loop is bound together through the G(N2)-C(O2) intra-strand H-bonds for the available G/C residues, which form further Watson-Crick pairings to a complementary sequence, through 2-fold symmetry, generating a pair of non-planar quadruplexes at the heart of the structure. Further, four adenine residues stack in pairs at one end, H-bonding through their N7-N6 positions, and are additionally stabilised through two highly conserved water positions at the structural terminus. This conformation is achieved through the rotation of the central thymine base at the pinnacle of the loop structure, where it stacks with an adjacent thymine residue within the lattice. The crystal packing yields two halved biological units, each related across a 2-fold symmetry axis spanning a cobalt hexammine residue between them, which stabilises the quadruplex structure through H-bonds to the phosphate oxygens and localised hydration.
About this Structure
Full crystallographic information is available from OCA.
Reference
Crystal structure of the complementary quadruplex formed by d(GCATGCT) at atomic resolution., Thorpe JH, Teixeira SC, Gale BC, Cardin CJ, Nucleic Acids Res. 2003 Feb 1;31(3):844-9. PMID:12560479 Page seeded by OCA on Sat May 3 00:57:42 2008
