Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.1.22.1 (DNase II)
 429 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The degradation of DNA in modified deoxyribonucleoprotein samples by DNase II in the presence of a polyanion (polypentose sulphate) was studied. The behaviour of DNP samples partially depleted of histone and treated with acetic anhydride is characterized by an increased accessibility of their DNA to DNase II, by a decreased polyanion amount needed for the maximum enzymatic degradation of their DNA, and, finally, by a more profound inhibitory effect of higher polyanion amounts on the DNase II-catalyzed degradation. On the other hand, the behaviour of DNP samples treated with formaldehyde is characterized by a decreased accessibility of their DNA to DNase II, by a limited increase in the enzymatic degradation of their DNA in the presence of the polyanion, and finally by a less profound inhibitory effect of higher polyanion amounts on the DNase II-catalyzed degradation.
 ...
PMID:The effect of polyanion on the enzymatic degradation of modified deoxyribonucleoprotein samples. 57 7

Vertebrate telomeres contain arrays of nucleosomes with unusually short and regular repeat lengths (Makarov, V. L., Lejnine, S., Bedoyan, J., and Langmore, J. P.(1993) Cell 73, 775-787; Lejnine, S., Makarov, V., and Langmore, J. P. (1995) Proc. Natl. Acad. Sci. U. S. A. 92, 2393-2397). In order to better define the specific structural features of telomere chromatin, we examined the condensation and H1 content of telomere nucleoproteins from rat liver. Velocity sedimentation analysis shows that telomeric nucleosome arrays condense with increasing ionic strength and molecular weight in a manner comparable with that of bulk chromatin despite the very short repeat length. However, these condensed structures do not exhibit the approximately 100-base pair deoxyribonuclease II repeat characteristic of condensed bulk chromatin. Frictional coefficient calculations suggest that telomere-specific higher order structure is more compact than bulk chromatin. Nucleoprotein gel electrophoresis shows that telomeric dinucleosomes from soluble chromatin contain H1. Finally, direct isolation and analysis of telomere nucleoproteins from formaldehyde-cross-linked nuclei indicate the presence of core histone proteins and H1. These results are consistent with the view that a major fraction of the long telomeres of rat are organized as specialized nucleosome arrays with features similar but not identical to those of bulk chromatin.
 ...
PMID:Condensation of rat telomere-specific nucleosomal arrays containing unusually short DNA repeats and histone H1. 870 94