Linked Life Data

6849890

Source:http://linkedlifedata.com/resource/pubmed/id/6849890

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
1983-7-15
pubmed:abstractText
The molecular structure of ammonium deoxycytidylyl-(3'-5')-deoxyguanosine, crystallized from aqueous acetone near pH 4, was determined for X-ray diffraction data. The crystals were tetragonal, space group P43212 with a = b = 11.078 (1) A and c = 45.826 (4) A. The structure was solved by tangent expansion of phases based on a derived phosphorus position and refined to R = 0.060 by full matrix least squares. Molecules related by a 2-fold symmetry axis are connected by hydrogen bonds between the bases and form parallel right-handed duplexes. Pairs of cytosines share a proton at N(3) and are joined by three hydrogen bonds: N(4)-H...O(2)...H-N(4), and N(3)-H...N(3). Guanines are joined by two hydrogen bonds: N(2)-H...N(3) and N(3)...H-N(2). Base-stacking interactions within the duplex are weak with the cytosine and guanine ring planes inclined at 24 degrees to each other in each monomer. Despite the unusual arrangement of the molecules, the sugar phosphate backbone has the g-g- conformation normally associated with right-handed double helical structures. Conformational parameters of the nucleosides are also typical with both sugars C(2')-endo and glycosidic torsion angles 55 degrees for cytidine and 94 degrees for guanosine. The bonding geometry of the bases is influenced by hydrogen bonding and charge-transfer networks in the crystal lattice. The solvent molecules interact with the dimer in three fused circular hydrogen bonding domains with a single disordered ammonium cation per d(CpG) dimer. Parallels with the formation of self base pairs and their implications in molecular biology are discussed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
22
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1833-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1983
pubmed:articleTitle
Self base pairing in a complementary deoxydinucleoside monophosphate duplex: crystal and molecular structure of deoxycytidylyl-(3'-5')-deoxyguanosine.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't