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• W2078909963 endingPage "e449" @default.
• W2078909963 startingPage "e449" @default.
• W2078909963 abstract "Blood flukes of the genus Schistosoma are platyhelminth parasites that infect 200 million people worldwide. Digestion of nutrients from the host bloodstream is essential for parasite development and reproduction. A network of proteolytic enzymes (proteases) facilitates hydrolysis of host hemoglobin and serum proteins.We identified a new cathepsin L termed SmCL3 using PCR strategies based on S. mansoni EST sequence data. An ortholog is present in Schistosoma japonicum. SmCL3 was heterologously expressed as an active enzyme in the yeast, Pichia pastoris. Recombinant SmCL3 has a broad pH activity range against peptidyl substrates and is inhibited by Clan CA protease inhibitors. Consistent with a function in degrading host proteins, SmCL3 hydrolyzes serum albumin and hemoglobin, is localized to the adult gastrodermis, and is expressed mainly in those life stages infecting the mammalian host. The predominant form of SmCL3 in the parasite exists as a zymogen, which is unusual for proteases. This zymogen includes an unusually long prodomain with alpha helical secondary structure motifs. The striking specificity of SmCL3 for amino acids with large aromatic side chains (Trp and Tyr) at the P2 substrate position, as determined with positional scanning-synthetic combinatorial library, is consistent with a molecular model that shows a large and deep S2 pocket. A sequence similarity network (SSN) view clusters SmCL3 and other cathepsins L in accordance with previous large-scale phylogenetic analyses that identify six super kingdoms.SmCL3 is a gut-associated cathepsin L that may contribute to the network of proteases involved in degrading host blood proteins as nutrients. Furthermore, this enzyme exhibits some unusual sequence and biophysical features that may result in additional functions. The visualization of network inter-relationships among cathepsins L suggests that these enzymes are suitable 'marker sequences' for inclusion in future phylogenetic analyses." @default.
• W2078909963 created "2016-06-24" @default.
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• W2078909963 date "2009-06-02" @default.
• W2078909963 modified "2023-10-17" @default.
• W2078909963 title "SmCL3, a Gastrodermal Cysteine Protease of the Human Blood Fluke Schistosoma mansoni" @default.
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• W2078909963 doi "https://doi.org/10.1371/journal.pntd.0000449" @default.
• W2078909963 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2685030" @default.
• W2078909963 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19488406" @default.
• W2078909963 hasPublicationYear "2009" @default.
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