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ribosomes

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ribosomes

Postby swatkat » Sun Mar 26, 2006 5:08 pm

ribosomes r measured in svedberg units,right?
eukaryotic ribosomes are 80s types
if i am correct :wink:
ribosomes have two subunits
40s and 60s subunits
so how come the total is more than 80s :?:
can some one explain what sedimentation coefficient actually is :?:
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Postby kitty82 » Sun Mar 26, 2006 5:52 pm

The unit "S" means Svedberg units, a measure of the rate of sedimentation of a particle in a centrifuge, where the sedimentation rate is associated with the size of the particle. Svedberg units are not additive - two subunits together can have Svedberg values that do not add up to that of the entire ribosome.
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Postby swatkat » Mon Mar 27, 2006 10:03 am

right......thx kitty82 :D
what other organelles are measured in svedberg units?
i guess other organelles can be measured by their sedimentation rates
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Postby kitty82 » Mon Mar 27, 2006 4:57 pm

Sure, no prob.
There are some organelles that can be measured IN S.U such as mitochondria, microsomes maybe nucleus but not sure. It could be used for gradient seperations that depend on their sedimentation rates. :)
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