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Owing to the quality control mechanisms operating in the early secretory compartment, only native proteins are secreted. Despite the difficulties in assembling planar immunoglobulin M (IgM) polymers, antibody‐secreting cells can release up to thousands of IgM per second. The finding that secretory μ (μs) chains bind to ERGIC‐53, a lectin transporter that cycles in the early secretory compartment,...
Protein folding catalysed by protein disulphide isomerase (PDI) has been studied both in vivo and in vitro using different assays. PDI contains a CGHC active site in each of its two catalytic domains (a and a′). The relative importance of each active site in PDI from Saccharomyces cerevisiae (yPDI) has been analysed by exchanging the active-site cysteine residues for serine residues. The activity...
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