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Effect of mercury ion on the stability of the lipid-protein complex of isolated chloroplasts

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Title Effect of mercury ion on the stability of the lipid-protein complex of isolated chloroplasts
 
Creator Panda, Sunakar
Panda, Sumita
 
Subject Mercury toxicity
Chloroplast
Reactive oxygen species
Photosynthetic assembly
 
Description 405-408
Mercury
is known to interact with different parts of living systems causing serious
biochemical and physiological disorder. In order to know the effect of mercury
(Hg2+) ion on chloroplasts, the cell free organelle are incubated in
an isotonic buffer medium in presence of mercury ion. The metal ion is found to
induce membrane lipid peroxidation, loss of photosynthetic pigments and
degradation of proteins. Such degradation brings about a drastic modification
of lipid-protein organization of chloroplasts as reflected from a blue shift of
absorption peaks and lowering of chlorophyll-a fluorescence intensity. The
detrimental effect of Hg2+ ion has been explained in terms of direct
binding with lipid-protein complex of photosynthetic membrane. Such a binding
of metal ion exposes the lipid-protein complex for an easier entry and attack
of reactive oxygen species (ROS) generated during incubation of chloroplasts in
light and dark, thereby resulting in higher disorganization, which is evident
from cation- induced changes in absorption and emission characteristics of the
organelle.
 
Date 2009-10-28T04:12:06Z
2009-10-28T04:12:06Z
2009-10
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/6300
 
Language en_US
 
Publisher CSIR
 
Source IJBB Vol.46(5) [October 2009]