In-cell NMR in E. coli to monitor maturation steps of hSOD1.
basic_science · Level V
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- Record sourced from PubMed, PMID 21887272.
- Also identified by DOI 10.1371/journal.pone.0023561 and PMC identifier PMC2962758.
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Abstract
In-cell NMR allows characterizing the folding state of a protein as well as posttranslational events at molecular level, in the cellular context. Here, the initial maturation steps of human copper, zinc superoxide dismutase 1 are characterized in the E. coli cytoplasm by in-cell NMR: from the apo protein, which is partially unfolded, to the zinc binding which causes its final quaternary structure. The protein selectively binds only one zinc ion, whereas in vitro also the copper site binds a non-physiological zinc ion. However, no intramolecular disulfide bridge formation occurs, nor copper uptake, suggesting the need of a specific chaperone for those purposes.