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Metalloporphyrin mediated DNA cleavage by a low concentration of HaeIII restriction enzyme.

Abstract：

:The plasmid DNA scission by the restriction enzyme HaeIII was investigated in the presence of tetrakis(1-methylpyridinium-4-yl)porphyrin (H2TMPyP) and its manganese(III), iron(III), nickel(II), cobalt(III) and zinc(II) derivatives. The effect of metalloporphyrins on plasmid DNA cleavage was ascertained by gel electrophoresis. UV-Vis absorption spectroscopy and circular dichroism (CD) spectroscopy. In the absence of the metalloporphyrins, plasmid DNA scission did not occur in the presence of a low concentration of HaeIII (0.2 units microL(-1)) at 37 degrees C after 1 h incubation. However, DNA cleavage occurred in the presence of the metalloporphyrins and HaeIII (0.2 units microL(-1)) at 37 degrees C after 1 h incubation. Gel electrophoresis results indicate the catalytic effect of metalloporphyrins (Mn(III)-, Fe(III)-, Co(III)- and Zn(II)TMPyP) by binding to both DNA and the enzyme through electrostatic interaction, which was confirmed by the change in UV-Vis and CD spectra. A mechanism for the enhanced DNA cleavage is proposed.

journal_name

J Inorg Biochem

journal_title

Journal of inorganic biochemistry

authors

Tabata M,Nakajima K,Nyarko E

doi

10.1016/s0162-0134(00)00067-2

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

383-9

issue

4

eissn

0162-0134

issn

1873-3344

pii

S0162-0134(00)00067-2

journal_volume

78

pub_type

杂志文章

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