Bio Unit 9.2 Discussion

Bio Unit 9.2 Discussion - (3). Please give an example to...

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(3). Please give an example to discuss how the post-translational modification of proteins occurs and how it affects protein structure and function. To begin this discussion, let’s first talk about the processes that occur during or immediately following polypeptides synthesis. It would be important to note that this discussion focuses primarily on processes occurring in eukaryotic cells. According to our textbook, Life: The Science of Biology, a key factor in determining the types of modification that will occur post translation will be where the proteins are destined to end up. Within the amino acid sequence of some polypeptides, there is a signal sequence that dictates where the polypeptide will go. Our text mentions that polypeptide chains begin their synthesis on free ribosomes in the cytoplasm. Eventually, the sequence will determine whether the translation will be completed in the cytoplasm and that it will later be released to an organelle such as the nucleus, mitochondria, plastids, or peroxisomes, or it may just remain in the cytosol. Alternatively, a sequence may command the postponement of translation, and will tell the ribosome to carry the unfinished peptide to
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This note was uploaded on 04/10/2011 for the course AAS 410.303.81 taught by Professor Pan during the Spring '11 term at Johns Hopkins.

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Bio Unit 9.2 Discussion - (3). Please give an example to...

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