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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Characterization of cDNA clones encoding a novel calcium-activated neutral proteinase from Schistosoma mansoni.

To identify and characterize Schistosoma mansoni proteins that are recognized by infected hosts, we have used a pool of sera from infected humans to screen cDNA libraries constructed from poly(A)+ mRNA of adult S. mansoni. The deduced amino acid sequences of the three isolated clones showed a high degree of similarity to the large subunit of calcium-activated neutral proteinase ( CANP) from humans and chicken. These overlapping clones, which include a nearly full-length clone with an open reading frame of 758 amino acid residues, together encode the entire large subunit of CANP. The deduced sequence of this S. mansoni protein can be divided into four domains (I-IV) that include the two domains characteristic of other large subunits of CANP: a thiol-protease domain (II) and a calcium-binding domain (IV) containing EF hand motifs. However, the schistosome protein is unique in having only three EF hand motifs in the calcium-binding domain and in having an additional EF hand motif that is shared between domains II and III. We have shown that these EF hand motifs are capable of binding 45Ca2+. Furthermore, the large subunit is S. mansoni contains an NH2-terminal sequence of 28 residues that is absent from the mammalian CANPs and has a high degree of similarity to the presumed receptor binding sequence of colicin Ia and Ib.[1]


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