Hemoglobin digestion in blood-feeding ticks: mapping a multipeptidase pathway by functional proteomics.
Hemoglobin digestion in blood-feeding ticks: mapping a multipeptidase pathway by functional proteomics.
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DOI:
10.1016/j.chembiol.2009.09.009
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发表时间:
2009-10-30
影响因子:
--
通讯作者:
Mares M
中科院分区:
文献类型:
--
作者:
Horn M;Nussbaumerová M;Sanda M;Kovárová Z;Srba J;Franta Z;Sojka D;Bogyo M;Caffrey CR;Kopácek P;Mares M
Hemoglobin digestion is an essential process for blood-feeding parasites. Using chemical tools, we deconvoluted the intracellular hemoglobinolytic cascade in the tick Ixodes ricinus, a vector of Lyme disease and tick-borne encephalitis. In tick gut tissue, a network of peptidases was demonstrated through imaging with specific activity-based probes and activity profiling with peptidic substrates/inhibitors. This peptidase network is induced upon blood feeding and degrades hemoglobin at acidic pH. Selective inhibitors were applied to dissect the roles of the individual peptidases and determine the peptidase-specific cleavage map of the hemoglobin molecule. The degradation pathway is initiated by endopeptidases of aspartic and cysteine class (cathepsin D supported by cathepsin L and legumain) and continued by cysteine amino- and carboxy-dipeptidases (cathepsins C and B). The identified enzymes are potential targets to developing novel anti-tick vaccines.
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