Sequence-Specificity for DNA Interstrand Cross-Linking by α,ω-Alkanediol Dimethylsulfonate Esters:  Evidence for DNA Distortion by the Initial Monofunctional Lesion

1999 ◽  
Vol 121 (51) ◽  
pp. 11942-11946 ◽  
Author(s):  
Yun-Hua Fan ◽  
Barry Gold
Keyword(s):  
Cross Linking ◽  
Sequence Specificity

DNA sequence specificity of mitomycin cross-linking

Biochemistry ◽  
1989 ◽  
Vol 28 (9) ◽  
pp. 3901-3907 ◽  
Author(s):  
Sally P. Teng ◽  
Sarah A. Woodson ◽  
Donald M. Crothers
Keyword(s):  
Dna Sequence ◽  
Cross Linking ◽  
Sequence Specificity ◽  
Dna Sequence Specificity

Formation of stable DNA triplexes

2011 ◽  
Vol 39 (2) ◽  
pp. 629-634 ◽  
Author(s):  
Keith R. Fox ◽  
Tom Brown
Keyword(s):  
Triple Helix ◽  
Low Ph ◽  
Cross Linking ◽  
Duplex Dna ◽  
Sequence Specificity ◽  
Modified Oligonucleotides ◽  
Major Groove ◽  
Dna Triplexes ◽  
Helix Formation ◽  
Triple Helix Formation

Triple-helical nucleic acids are formed by binding an oligonucleotide within the major groove of duplex DNA. These complexes offer the possibility of designing oligonucleotides which bind to duplex DNA with considerable sequence specificity. However, triple-helix formation with natural nucleotides is limited by (i) the requirement for low pH, (ii) the requirement for homopurine target sequences, and (iii) their relatively low affinity. We have prepared modified oligonucleotides to overcome these limitations, including the addition of positive charges to the sugar and/or base, the inclusion of cytosine analogues, the development of nucleosides for recognition of pyrimidine interruptions and the attachment of one or more cross-linking groups. By these means we are able to generate triplexes which have high affinities at physiological pH at sequences that contain pyrimidine interruptions.

Influence of Calcium Ions on the Plant Cell Surface: Membrane Fusions and Conformational Changes

1974 ◽  
Vol 32 ◽  
pp. 154-155
Author(s):  
D. James Morré ◽  
Charles E. Bracker ◽  
William J. VanDerWoude
Keyword(s):  
Cell Wall ◽  
Cell Surface ◽  
Conformational Changes ◽  
Calcium Ions ◽  
Surface Membrane ◽  
Carboxyl Groups ◽  
Cross Linking ◽  
Ultrastructural Evidence ◽  
Glycine Max L ◽  
Wall Extensibility

Calcium ions in the concentration range 5-100 mM inhibit auxin-induced cell elongation and wall extensibility of plant stems. Inhibition of wall extensibility requires that the tissue be living; growth inhibition cannot be explained on the basis of cross-linking of carboxyl groups of cell wall uronides by calcium ions. In this study, ultrastructural evidence was sought for an interaction of calcium ions with some component other than the wall at the cell surface of soybean (Glycine max (L.) Merr.) hypocotyls.

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