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Questions in Endoplasmic Reticulum
Page 1 out of 10 Pages
- What recognizes the presequence on amino acids destined to the mitochondria and how does it send the chain to the mitochondria?(36725 views)
- This is probably self-evident, but I was just confused about the membrane proteins of the mitochondria. Are they not involved with the ER at all? I mean do they have their own stop transfer sequences that TOM and TIM recognize, separate from ribosomal translation on the RER?(33850 views)
- I was just looking over my notes and I had written down something about mitochondrial peptidases but can't really figure out what. The name makes it sound like its hydrolyzing an amino acid sequence somewhere. But where in that diagram of mitochondrial protein import is the peptidase acting and what is it hydrolyzing? Also does this require the use of ATP?(38516 views)
- I was wondering if the entire nucleus is covered by ER, or if patches of it are covered. I wonder this because, if the entire nucleus is covered, then how do the Nuclear pore complexes allow for the exchange of material with the cytoplasm?(24489 views)
- Is a mitochondrial presequence cleaved off for the same reason that an ER-directed signal peptide would be?(23400 views)
- The N-linked glycosylation process makes sense, but what is the point of trimming, why are glucose monomers and one more monomer removed from the 14-mer, and why are they on there in the first place?(19791 views)
- What is the point of glycolipid anchors? Why is it necessary for a protein to be bound to a GPI anchor in a cell?(17164 views)
- Keeping in mind the fact that cells like to be as efficient as possible, why is it that some mRNA is translated in one place and then again transported to another place? Why would they have such signals that tell it to go to one place to be translated then go to another?(209137 views)
- I was just wondering why we have not discussed why no ATP or any other energy source is required to bring the ribosome to the outside of the ER. Energy is needed to bring the protein to TOM/TIM in the mitochondria so why wouldn't it be needed to bring the ribosome to ER?(18964 views)
- I was confused over reading something in the book compared to the notes I took in class (probably didn't understand what I wrote). Is BiP only for posttranslational import of proteins into ER (like in yeast) or is BiP used to pull in polypeptide in cotranslational translocation as well?(19402 views)
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