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why isn't there cholestrol in the membranes of mitochondria and cholroblasts?

why isn't there cholestrol in the membranes of mitochondria and cholroblasts? - Biochemistry Forum

why isn't there cholestrol in the membranes of mitochondria and cholroblasts? - Discuss and post questions regarding the study of Biochemistry. If you need homework help this is the place to ask!


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Old 10-05-2011, 08:39 PM
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Exclamation why isn't there cholestrol in the membranes of mitochondria and cholroblasts?



Good night everybody
I wanna ask a little question..
why isn't there cholestrol in the inner membranes of mitochondria and chloroplasts although it exists in all other membranes?
A prof at university where I study told me that there are some enzymes related to degradation of cholesterol in the mitochondria matrix, so it is impossible for cholesterol to exist there because it will simple be degraded! However, I am not sure this might be true, cholesterol is a non-polar molecule, means that it might exist (assuming) in the interior of the membrane, away from the aqueous environment of the matrix, and this means that it is basically away from the enzymes responsible for the degradation of cholesterol, therefore, these enzymes are not the reason!
So, can anybody answer me please?
Thank You
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Old 10-07-2011, 08:11 AM
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Default Re: why isn't there cholestrol in the membranes of mitochondria and cholroblasts?

Both Mitochondria and chloroplasts originated by a endosymbiotic event when a bacterium was captured by a eukaryotic cell. And bacteria doesn't have cholesterol in its membrane. i think lack of cholesterol may be evolutionary significance.

Last edited by obama; 10-07-2011 at 08:12 AM.
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cholestrol , cholroblasts , membranes , mitochondria


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