Friday, November 20, 2009

In bacteria cells, how are proteins made? and what do proteasomes do to break down these proteins?

Proteins are made just as they are in eukaryotes via the process known as translation. The ribosomes are slightly different (70S in prokaryotes versus 80S in eukaryoties) but they're still made up of rRNA and protein subunits. In eukaryotes, transcription (DNA ---%26gt; RNA) and translation are temporally and spatially separated by the nuclear membrane. In prokaryotes, however, there is no such separation as there is no nuclear membrane. That is transcription and translation can occur at the same time. I'm not sure how protein degradation works in prokaryotes - but i know in eukaryotes, proteins to be degraded are ubquitinated and this targets them for degradation by the proteasome. That's as much as i can offer


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