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plasmodesm and gap junction

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plasmodesm and gap junction

Postby mnatashgaran » Sun Mar 31, 2013 7:42 pm

Both of plasmodesm (in plant cells) and gap juction (in animal cells) pass the micromolecules & ions and connect the cells to each other. Why do all plant cells have plasmodesmata but only some animal cells have gap junctions?
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Postby mnatashgaran » Mon Apr 01, 2013 7:46 pm

The answer I found is that plant cell walls are not permeable to big proteins (more than 30-60 kDa), so they must be passed by plasmodesmata (with 20-40 nm diameter). As a result, every plant cell needs plasmodesmata but animal cells haven't any barrier like cell walls for protein transportation. So an animal cell necessarily doesn't have gap junction. But I'm not sure. Is it right?
Any idea would be appreciated.
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