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Indian Journal of Biochemistry and Biophysics (IJBB) >
IJBB Vol.46 [2009] >
IJBB Vol.46(5) [October 2009] >
| Title: | Effect of mercury ion on the stability of the lipid-protein complex of isolated chloroplasts |
| Authors: | Panda, Sunakar
Panda, Sumita |
| Keywords: | Mercury toxicity
Chloroplast
Reactive oxygen species
Photosynthetic assembly |
| Issue Date: | Oct-2009 |
| Publisher: | CSIR |
| Abstract: | 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. |
| Page(s): | 405-408 |
| ISSN: | 0975-0959 (Online); 0301-1208 (Print) |
| Source: | IJBB Vol.46(5) [October 2009]
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