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| | {{STRUCTURE_187d| PDB=187d | SCENE= }} | | {{STRUCTURE_187d| PDB=187d | SCENE= }} |
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| - | '''HYDRATION PATTERNS AND INTERMOLECULAR INTERACTIONS IN A-DNA CRYSTAL STRUCTURES. IMPLICATIONS FOR DNA RECOGNITION'''
| + | ===HYDRATION PATTERNS AND INTERMOLECULAR INTERACTIONS IN A-DNA CRYSTAL STRUCTURES. IMPLICATIONS FOR DNA RECOGNITION=== |
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| - | ==Overview==
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| - | Crystallographic studies of DNA fragments of the A and B conformations have shown that the structure and hydration of the DNA double helix depend both on the base sequence and the environment. Detailed analyses of solvent organization in DNA crystals and its role in intermolecular interactions have been reported mainly for B-DNA structures. We have determined the crystal structures of several isomorphous A-DNA octamers at resolutions from 1.8 to 2.5 A and refined them by the same procedure. Comparative analysis of five independently refined structures in terms of hydration and intermolecular interactions has been performed leading to the following findings. The A-DNA major groove is extensively hydrated and together with the hydration shells of the sugar-phosphate backbone can form an ordered network of fused polygons. The water structure of the phosphate backbone is less conserved than that of the grooves. Characteristic hydration patterns are associated with specific base sequences. The A-DNA minor groove provides sites for intermolecular contacts through hydrophobic and polar interactions. Well-ordered water molecules mediate interduplex interactions that involve either the grooves or the backbone, or both. The direct and water-mediated intermolecular interactions observed in the A-DNA crystal structures are relevant to various recognition motifs between DNA and other molecules. In particular, intermolecular interactions at the DNA minor groove are analogous to those observed in the recently reported crystal structures of complexes between the TATA-binding protein and the TATA-box.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_7752232}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 7752232 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_7752232}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: A-dna]] | | [[Category: A-dna]] |
| | [[Category: Double helix]] | | [[Category: Double helix]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:34:37 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 15:38:35 2008'' |
Revision as of 12:38, 30 June 2008
Template:STRUCTURE 187d
HYDRATION PATTERNS AND INTERMOLECULAR INTERACTIONS IN A-DNA CRYSTAL STRUCTURES. IMPLICATIONS FOR DNA RECOGNITION
Template:ABSTRACT PUBMED 7752232
About this Structure
Full crystallographic information is available from OCA.
Reference
Hydration patterns and intermolecular interactions in A-DNA crystal structures. Implications for DNA recognition., Eisenstein M, Shakked Z, J Mol Biol. 1995 May 5;248(3):662-78. PMID:7752232
Page seeded by OCA on Mon Jun 30 15:38:35 2008
