High-resolution structure of a Kazal-type serine protease inhibitor from the dengue vector Aedes aegypti
Research article published in Acta crystallographica. Section F, Structural biology communications (2017)
Abstract
Blood-feeding exoparasites are rich sources of protease inhibitors, and the mosquito Aedes aegypti, which is a vector of Dengue virus, Yellow fever virus, Chikungunya virus and Zika virus, is no exception. AaTI is a single-domain, noncanonical Kazal-type serine proteinase inhibitor from A. aegypti that recognizes both digestive trypsin-like serine proteinases and the central protease in blood clotting, thrombin, albeit with an affinity that is three orders of magnitude lower. Here, the 1.4 Å resolution crystal structure of AaTI is reported from extremely tightly packed crystals (∼22% solvent content), revealing the structural determinants for the observed inhibitory profile of this molecule.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Summary
Peer-reviewed molecular research relevant to leech biology, genomics, and proteomics. Indexed in PubMed and verified against the NCBI record.
Why This Matters for Hirudotherapy
This structural-biology study solved the 1.4 A crystal structure of AaTI, a noncanonical Kazal-type serine protease inhibitor from the mosquito Aedes aegypti, showing it inhibits both digestive trypsin-like proteases and the clotting enzyme thrombin (the latter with roughly three orders of magnitude lower affinity). The only conceptual overlap with hirudotherapy is thematic: blood-feeding organisms are recurrent sources of anticoagulant protease inhibitors, and Kazal-type inhibitors also occur in the leech secretome. However, this is a clear organism collision -- AaTI is a mosquito protein, not a Hirudo medicinalis leech compound -- so direct hirudotherapy relevance is minimal; it belongs in the library as a structural reference point, not as leech evidence. Caveat: a purely structural/in-vitro characterization of a non-leech protein, with no animal or clinical data and no bearing on leech-therapy outcomes.
Citation
High-resolution structure of a Kazal-type serine protease inhibitor from the dengue vector Aedes aegypti.
Torquato et al. · Acta crystallographica. Section F, Structural biology communications, 2017
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