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Solution structure of Cu(II) complexes with spermine and nucleosides or nucleotides in ternary systems

100%

Gąsowska A. , Łomozik L. , Brieger-Jarzębowska R.

Polish Journal of Chemistry

1999

tom vol. 73 nr 6

909-913

The mode of coordination of the complexes formed in the systems Cu/spermine/nucleoside (or nucleotide) was proposed on the basis of the equilibrium and spectral studies. Significant differences were found in the coordination character of nucleosides and nucleotides. In the systems with adenosine or cytidine, mixed-ligand complexes are formed with the N5 type coordination. On the other hand, in the systems with their monophosphates, molecular complexes are formed with metal ions coordinated through monophosphates, molecular complexes are formed with metal ions coordinated through oxygen atoms from the phosphate groups. Spermine, left outside the inner coordination sphere, is involved in non-covalent interactions with nitrogen atoms from the nucleotide bases.

Molecular recognition motifs in cytidinium and 2'-deoxycytidinium salts with composite anions

100%

Gilski M. , Jaskolski M.

Acta Biochimica Polonica

1998

tom 45

nr 4

In the crystal structures of N3-protonated cytidinium and 2'-deoxycytidinium salts with composite XYn anions capable of accepting hydrogen bonds through their Y atoms, the dominating motif of cytosinium...anion interactions consists of a pair of hydrogen bonds donated from the N3+-H protonation site and from the exoamino N4-H41 group cis to N3, and accepted by two Y centers of one anion. This multi-point recognition pattern is stable and robust and thus can be classified as a supramolecular synthon. In a broader group of N3-protonated, N1-substituted cytosinium salts with composite anions it occurs with 70% frequency. The C5 side of the cytosine ring mimics the N3+-H type synthon and shows a propensity to form an analogous motif in which a C5-H5...Y hydrogen bond replaces the strong N3+-H...Y interaction. Since the C-H...Y bond is much weaker, the secondary motif shows higher deformability and is less frequent (44%).

In search of ionizing radiation effect on nucleosides: radiolysis of cytidine

84%

Zavyalova O. , Janiak A. , Misiura K. , Truszkowski S. , Chostenko A.

Current Topics in Biophysics. Supplement

2011

tom 34

nr A: Posters

Some kinetic studies on cytidine aminohydrolase activity from Aspergillus niger NRRL3

67%

Ali T. H.

1998

tom 47

nr 4