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- W2055943334 abstract "Covalent Superose microspheres-bound C3b was used as a model system to simplify the analysis of antigen-bound C3b modifications during antigen processing. The model was set up using purified C3 and Superose-bound trypsin. C3b was covalently bound to Superose through an ester link, as indicated by lability to hydroxylamine treatment at alkaline pH. C3b-Superose was incubated with L subcellular fraction, enriched in endosomes/lysosomes, purified from U937 cell line. Two types of limited activities on the C3b-Superose model system were detected: (i) a proteolytic activity cleaving C3b into mainly a C3c-like fragment which was released and a C3d-like fragment of apparent Mr 32 kDa which remained bound to Superose through the original ester link; (ii) an esterolytic activity cleaving the ester bond and releasing C3b. Inhibition experiments pointed to the involvement of serine, aspartyl and cysteine proteases. Cathepsin B appeared most probably as one of the major proteases of L fraction catalysing the proteolysis of the C3b-bound. Kinetic studies were in favour of a good stability of the ester bond, supporting an effective role of C3b as a chaperone during the extracellular and intracellular travel of C3b-bound antigen." @default.
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- W2055943334 date "1993-07-01" @default.
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- W2055943334 title "Associated complement C3b. Towards an understanding of its intracellular modifications" @default.
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- W2055943334 doi "https://doi.org/10.1016/0161-5890(93)90009-z" @default.
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