This response was embarrassingly flip due to not understanding what the relevance of the discussion shift was. I apologize for shooting from the hip and would be happy to hear why you feel the distinction is important to the discussion.
Funny, because it really seemed like you were the one that didn't read your own reference.
LOL. The problem is a comprehension issue on your part.
I'm going to give up on this topic given you can't seem to comprehend that there are more than one type of chaperones and that the sigma-1 receptor is not a protein chaperone. Therefore, it does not chaperone proteins.
Protein chaperones chaperone proteins in order to try to prevent misfolding.
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