Abstract
A monoclonal mouse IgG1 antibody was produced against the aminopropeptide of dermatosparactic sheep procollagen type I by using the hybridoma technique. Radioimmunoassays demonstrated an apparent affinity constant of 10(8) l X mol-1. The antibody reacted with a 19-amino-acid-long sequence spanning the procollagen N-proteinase cleavage site with stronger binding to structures contributed by the aminopropeptide. The antibody showed strong cross-reactions with similar antigens of bovine, human or chick origin but failed to react with the aminopropeptide of procollagen type III. Incubation of chick or sheep procollagen type I with stoichiometric amounts of antibody blocked the release from procollagen molecules of the aminopropeptide by procollagen N-proteinase. Thus, this antibody seems useful for studying various biological problems encountered in the conversion of procollagen.
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